Redmine 3.4.4
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23
lib/plugins/acts_as_list/README
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23
lib/plugins/acts_as_list/README
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ActsAsList
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==========
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This acts_as extension provides the capabilities for sorting and reordering a number of objects in a list. The class that has this specified needs to have a +position+ column defined as an integer on the mapped database table.
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Example
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=======
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class TodoList < ActiveRecord::Base
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has_many :todo_items, :order => "position"
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end
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class TodoItem < ActiveRecord::Base
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belongs_to :todo_list
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acts_as_list :scope => :todo_list
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end
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todo_list.first.move_to_bottom
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todo_list.last.move_higher
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Copyright (c) 2007 David Heinemeier Hansson, released under the MIT license
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3
lib/plugins/acts_as_list/init.rb
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3
lib/plugins/acts_as_list/init.rb
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$:.unshift "#{File.dirname(__FILE__)}/lib"
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require 'active_record/acts/list'
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ActiveRecord::Base.class_eval { include ActiveRecord::Acts::List }
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281
lib/plugins/acts_as_list/lib/active_record/acts/list.rb
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281
lib/plugins/acts_as_list/lib/active_record/acts/list.rb
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module ActiveRecord
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module Acts #:nodoc:
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module List #:nodoc:
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def self.included(base)
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base.extend(ClassMethods)
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end
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# This +acts_as+ extension provides the capabilities for sorting and reordering a number of objects in a list.
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# The class that has this specified needs to have a +position+ column defined as an integer on
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# the mapped database table.
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#
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# Todo list example:
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#
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# class TodoList < ActiveRecord::Base
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# has_many :todo_items, :order => "position"
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# end
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#
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# class TodoItem < ActiveRecord::Base
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# belongs_to :todo_list
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# acts_as_list :scope => :todo_list
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# end
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#
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# todo_list.first.move_to_bottom
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# todo_list.last.move_higher
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module ClassMethods
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# Configuration options are:
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#
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# * +column+ - specifies the column name to use for keeping the position integer (default: +position+)
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# * +scope+ - restricts what is to be considered a list. Given a symbol, it'll attach <tt>_id</tt>
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# (if it hasn't already been added) and use that as the foreign key restriction. It's also possible
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# to give it an entire string that is interpolated if you need a tighter scope than just a foreign key.
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# Example: <tt>acts_as_list :scope => 'todo_list_id = #{todo_list_id} AND completed = 0'</tt>
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def acts_as_list(options = {})
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ActiveSupport::Deprecation.warn "The acts_as_list plugin will be removed from Redmine 4 core, use the acts_as_list gem or similar implementation instead."
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configuration = { :column => "position", :scope => "1 = 1" }
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configuration.update(options) if options.is_a?(Hash)
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configuration[:scope] = "#{configuration[:scope]}_id".intern if configuration[:scope].is_a?(Symbol) && configuration[:scope].to_s !~ /_id$/
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if configuration[:scope].is_a?(Symbol)
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scope_condition_method = %(
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def scope_condition
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if #{configuration[:scope].to_s}.nil?
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"#{configuration[:scope].to_s} IS NULL"
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else
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"#{configuration[:scope].to_s} = \#{#{configuration[:scope].to_s}}"
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end
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end
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)
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else
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scope_condition_method = "def scope_condition() \"#{configuration[:scope]}\" end"
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end
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class_eval <<-EOV
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include ActiveRecord::Acts::List::InstanceMethods
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def acts_as_list_class
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::#{self.name}
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end
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def position_column
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'#{configuration[:column]}'
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end
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#{scope_condition_method}
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before_destroy :remove_from_list
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before_create :add_to_list_bottom
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EOV
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end
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end
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# All the methods available to a record that has had <tt>acts_as_list</tt> specified. Each method works
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# by assuming the object to be the item in the list, so <tt>chapter.move_lower</tt> would move that chapter
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# lower in the list of all chapters. Likewise, <tt>chapter.first?</tt> would return +true+ if that chapter is
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# the first in the list of all chapters.
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module InstanceMethods
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# Insert the item at the given position (defaults to the top position of 1).
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def insert_at(position = 1)
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insert_at_position(position)
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end
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# Swap positions with the next lower item, if one exists.
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def move_lower
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return unless lower_item
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acts_as_list_class.transaction do
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lower_item.decrement_position
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increment_position
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end
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end
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# Swap positions with the next higher item, if one exists.
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def move_higher
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return unless higher_item
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acts_as_list_class.transaction do
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higher_item.increment_position
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decrement_position
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end
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end
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# Move to the bottom of the list. If the item is already in the list, the items below it have their
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# position adjusted accordingly.
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def move_to_bottom
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return unless in_list?
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acts_as_list_class.transaction do
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decrement_positions_on_lower_items
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assume_bottom_position
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end
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end
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# Move to the top of the list. If the item is already in the list, the items above it have their
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# position adjusted accordingly.
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def move_to_top
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return unless in_list?
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acts_as_list_class.transaction do
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increment_positions_on_higher_items
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assume_top_position
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end
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end
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# Move to the given position
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def move_to=(pos)
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case pos.to_s
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when 'highest'
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move_to_top
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when 'higher'
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move_higher
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when 'lower'
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move_lower
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when 'lowest'
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move_to_bottom
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end
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reset_positions_in_list
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end
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def reset_positions_in_list
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acts_as_list_class.where(scope_condition).reorder("#{position_column} ASC, id ASC").each_with_index do |item, i|
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unless item.send(position_column) == (i + 1)
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acts_as_list_class.where({:id => item.id}).
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update_all({position_column => (i + 1)})
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end
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end
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end
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# Removes the item from the list.
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def remove_from_list
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if in_list?
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decrement_positions_on_lower_items
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update_attribute position_column, nil
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end
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end
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# Increase the position of this item without adjusting the rest of the list.
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def increment_position
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return unless in_list?
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update_attribute position_column, self.send(position_column).to_i + 1
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end
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# Decrease the position of this item without adjusting the rest of the list.
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def decrement_position
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return unless in_list?
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update_attribute position_column, self.send(position_column).to_i - 1
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end
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# Return +true+ if this object is the first in the list.
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def first?
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return false unless in_list?
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self.send(position_column) == 1
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end
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# Return +true+ if this object is the last in the list.
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def last?
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return false unless in_list?
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self.send(position_column) == bottom_position_in_list
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end
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# Return the next higher item in the list.
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def higher_item
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return nil unless in_list?
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acts_as_list_class.where(
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"#{scope_condition} AND #{position_column} = #{(send(position_column).to_i - 1).to_s}"
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).first
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end
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# Return the next lower item in the list.
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def lower_item
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return nil unless in_list?
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acts_as_list_class.where(
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"#{scope_condition} AND #{position_column} = #{(send(position_column).to_i + 1).to_s}"
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).first
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end
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# Test if this record is in a list
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def in_list?
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!send(position_column).nil?
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end
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private
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def add_to_list_top
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increment_positions_on_all_items
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end
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def add_to_list_bottom
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self[position_column] = bottom_position_in_list.to_i + 1
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end
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# Overwrite this method to define the scope of the list changes
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def scope_condition() "1" end
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# Returns the bottom position number in the list.
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# bottom_position_in_list # => 2
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def bottom_position_in_list(except = nil)
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item = bottom_item(except)
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item ? item.send(position_column) : 0
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end
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# Returns the bottom item
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def bottom_item(except = nil)
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conditions = scope_condition
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conditions = "#{conditions} AND #{self.class.primary_key} != #{except.id}" if except
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acts_as_list_class.where(conditions).reorder("#{position_column} DESC").first
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end
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# Forces item to assume the bottom position in the list.
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def assume_bottom_position
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update_attribute(position_column, bottom_position_in_list(self).to_i + 1)
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end
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# Forces item to assume the top position in the list.
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def assume_top_position
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update_attribute(position_column, 1)
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end
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# This has the effect of moving all the higher items up one.
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def decrement_positions_on_higher_items(position)
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acts_as_list_class.
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where("#{scope_condition} AND #{position_column} <= #{position}").
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update_all("#{position_column} = (#{position_column} - 1)")
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end
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# This has the effect of moving all the lower items up one.
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def decrement_positions_on_lower_items
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return unless in_list?
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acts_as_list_class.
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where("#{scope_condition} AND #{position_column} > #{send(position_column).to_i}").
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update_all("#{position_column} = (#{position_column} - 1)")
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end
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# This has the effect of moving all the higher items down one.
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def increment_positions_on_higher_items
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return unless in_list?
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acts_as_list_class.
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where("#{scope_condition} AND #{position_column} < #{send(position_column).to_i}").
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update_all("#{position_column} = (#{position_column} + 1)")
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end
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# This has the effect of moving all the lower items down one.
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def increment_positions_on_lower_items(position)
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acts_as_list_class.
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where("#{scope_condition} AND #{position_column} >= #{position}").
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update_all("#{position_column} = (#{position_column} + 1)")
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end
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# Increments position (<tt>position_column</tt>) of all items in the list.
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def increment_positions_on_all_items
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acts_as_list_class.
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where("#{scope_condition}").
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update_all("#{position_column} = (#{position_column} + 1)")
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end
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def insert_at_position(position)
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remove_from_list
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increment_positions_on_lower_items(position)
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self.update_attribute(position_column, position)
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end
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end
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end
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end
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end
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332
lib/plugins/acts_as_list/test/list_test.rb
Normal file
332
lib/plugins/acts_as_list/test/list_test.rb
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@ -0,0 +1,332 @@
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require 'test/unit'
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require 'rubygems'
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gem 'activerecord', '>= 1.15.4.7794'
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require 'active_record'
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require "#{File.dirname(__FILE__)}/../init"
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ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :dbfile => ":memory:")
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def setup_db
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ActiveRecord::Schema.define(:version => 1) do
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create_table :mixins do |t|
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t.column :pos, :integer
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t.column :parent_id, :integer
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t.column :created_at, :datetime
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t.column :updated_at, :datetime
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end
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end
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end
|
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|
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def teardown_db
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ActiveRecord::Base.connection.tables.each do |table|
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ActiveRecord::Base.connection.drop_table(table)
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end
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end
|
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class Mixin < ActiveRecord::Base
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end
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class ListMixin < Mixin
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acts_as_list :column => "pos", :scope => :parent
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def self.table_name() "mixins" end
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end
|
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|
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class ListMixinSub1 < ListMixin
|
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end
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|
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class ListMixinSub2 < ListMixin
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end
|
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|
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class ListWithStringScopeMixin < ActiveRecord::Base
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acts_as_list :column => "pos", :scope => 'parent_id = #{parent_id}'
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def self.table_name() "mixins" end
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end
|
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|
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|
||||
class ListTest < Test::Unit::TestCase
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def setup
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setup_db
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(1..4).each { |counter| ListMixin.create! :pos => counter, :parent_id => 5 }
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end
|
||||
|
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def teardown
|
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teardown_db
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end
|
||||
|
||||
def test_reordering
|
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assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
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ListMixin.find(2).move_lower
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assert_equal [1, 3, 2, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
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|
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ListMixin.find(2).move_higher
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assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(1).move_to_bottom
|
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assert_equal [2, 3, 4, 1], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(1).move_to_top
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assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).move_to_bottom
|
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assert_equal [1, 3, 4, 2], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(4).move_to_top
|
||||
assert_equal [4, 1, 3, 2], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
end
|
||||
|
||||
def test_move_to_bottom_with_next_to_last_item
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
ListMixin.find(3).move_to_bottom
|
||||
assert_equal [1, 2, 4, 3], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
end
|
||||
|
||||
def test_next_prev
|
||||
assert_equal ListMixin.find(2), ListMixin.find(1).lower_item
|
||||
assert_nil ListMixin.find(1).higher_item
|
||||
assert_equal ListMixin.find(3), ListMixin.find(4).higher_item
|
||||
assert_nil ListMixin.find(4).lower_item
|
||||
end
|
||||
|
||||
def test_injection
|
||||
item = ListMixin.new(:parent_id => 1)
|
||||
assert_equal "parent_id = 1", item.scope_condition
|
||||
assert_equal "pos", item.position_column
|
||||
end
|
||||
|
||||
def test_insert
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 1, new.pos
|
||||
assert new.first?
|
||||
assert new.last?
|
||||
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 2, new.pos
|
||||
assert !new.first?
|
||||
assert new.last?
|
||||
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 3, new.pos
|
||||
assert !new.first?
|
||||
assert new.last?
|
||||
|
||||
new = ListMixin.create(:parent_id => 0)
|
||||
assert_equal 1, new.pos
|
||||
assert new.first?
|
||||
assert new.last?
|
||||
end
|
||||
|
||||
def test_insert_at
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 1, new.pos
|
||||
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 2, new.pos
|
||||
|
||||
new = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 3, new.pos
|
||||
|
||||
new4 = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 4, new4.pos
|
||||
|
||||
new4.insert_at(3)
|
||||
assert_equal 3, new4.pos
|
||||
|
||||
new.reload
|
||||
assert_equal 4, new.pos
|
||||
|
||||
new.insert_at(2)
|
||||
assert_equal 2, new.pos
|
||||
|
||||
new4.reload
|
||||
assert_equal 4, new4.pos
|
||||
|
||||
new5 = ListMixin.create(:parent_id => 20)
|
||||
assert_equal 5, new5.pos
|
||||
|
||||
new5.insert_at(1)
|
||||
assert_equal 1, new5.pos
|
||||
|
||||
new4.reload
|
||||
assert_equal 5, new4.pos
|
||||
end
|
||||
|
||||
def test_delete_middle
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).destroy
|
||||
|
||||
assert_equal [1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(1).pos
|
||||
assert_equal 2, ListMixin.find(3).pos
|
||||
assert_equal 3, ListMixin.find(4).pos
|
||||
|
||||
ListMixin.find(1).destroy
|
||||
|
||||
assert_equal [3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(3).pos
|
||||
assert_equal 2, ListMixin.find(4).pos
|
||||
end
|
||||
|
||||
def test_with_string_based_scope
|
||||
new = ListWithStringScopeMixin.create(:parent_id => 500)
|
||||
assert_equal 1, new.pos
|
||||
assert new.first?
|
||||
assert new.last?
|
||||
end
|
||||
|
||||
def test_nil_scope
|
||||
new1, new2, new3 = ListMixin.create, ListMixin.create, ListMixin.create
|
||||
new2.move_higher
|
||||
assert_equal [new2, new1, new3], ListMixin.find(:all, :conditions => 'parent_id IS NULL', :order => 'pos')
|
||||
end
|
||||
|
||||
|
||||
def test_remove_from_list_should_then_fail_in_list?
|
||||
assert_equal true, ListMixin.find(1).in_list?
|
||||
ListMixin.find(1).remove_from_list
|
||||
assert_equal false, ListMixin.find(1).in_list?
|
||||
end
|
||||
|
||||
def test_remove_from_list_should_set_position_to_nil
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).remove_from_list
|
||||
|
||||
assert_equal [2, 1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(1).pos
|
||||
assert_equal nil, ListMixin.find(2).pos
|
||||
assert_equal 2, ListMixin.find(3).pos
|
||||
assert_equal 3, ListMixin.find(4).pos
|
||||
end
|
||||
|
||||
def test_remove_before_destroy_does_not_shift_lower_items_twice
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).remove_from_list
|
||||
ListMixin.find(2).destroy
|
||||
|
||||
assert_equal [1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(1).pos
|
||||
assert_equal 2, ListMixin.find(3).pos
|
||||
assert_equal 3, ListMixin.find(4).pos
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
class ListSubTest < Test::Unit::TestCase
|
||||
|
||||
def setup
|
||||
setup_db
|
||||
(1..4).each { |i| ((i % 2 == 1) ? ListMixinSub1 : ListMixinSub2).create! :pos => i, :parent_id => 5000 }
|
||||
end
|
||||
|
||||
def teardown
|
||||
teardown_db
|
||||
end
|
||||
|
||||
def test_reordering
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).move_lower
|
||||
assert_equal [1, 3, 2, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).move_higher
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(1).move_to_bottom
|
||||
assert_equal [2, 3, 4, 1], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(1).move_to_top
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).move_to_bottom
|
||||
assert_equal [1, 3, 4, 2], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(4).move_to_top
|
||||
assert_equal [4, 1, 3, 2], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
end
|
||||
|
||||
def test_move_to_bottom_with_next_to_last_item
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
ListMixin.find(3).move_to_bottom
|
||||
assert_equal [1, 2, 4, 3], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
end
|
||||
|
||||
def test_next_prev
|
||||
assert_equal ListMixin.find(2), ListMixin.find(1).lower_item
|
||||
assert_nil ListMixin.find(1).higher_item
|
||||
assert_equal ListMixin.find(3), ListMixin.find(4).higher_item
|
||||
assert_nil ListMixin.find(4).lower_item
|
||||
end
|
||||
|
||||
def test_injection
|
||||
item = ListMixin.new("parent_id"=>1)
|
||||
assert_equal "parent_id = 1", item.scope_condition
|
||||
assert_equal "pos", item.position_column
|
||||
end
|
||||
|
||||
def test_insert_at
|
||||
new = ListMixin.create("parent_id" => 20)
|
||||
assert_equal 1, new.pos
|
||||
|
||||
new = ListMixinSub1.create("parent_id" => 20)
|
||||
assert_equal 2, new.pos
|
||||
|
||||
new = ListMixinSub2.create("parent_id" => 20)
|
||||
assert_equal 3, new.pos
|
||||
|
||||
new4 = ListMixin.create("parent_id" => 20)
|
||||
assert_equal 4, new4.pos
|
||||
|
||||
new4.insert_at(3)
|
||||
assert_equal 3, new4.pos
|
||||
|
||||
new.reload
|
||||
assert_equal 4, new.pos
|
||||
|
||||
new.insert_at(2)
|
||||
assert_equal 2, new.pos
|
||||
|
||||
new4.reload
|
||||
assert_equal 4, new4.pos
|
||||
|
||||
new5 = ListMixinSub1.create("parent_id" => 20)
|
||||
assert_equal 5, new5.pos
|
||||
|
||||
new5.insert_at(1)
|
||||
assert_equal 1, new5.pos
|
||||
|
||||
new4.reload
|
||||
assert_equal 5, new4.pos
|
||||
end
|
||||
|
||||
def test_delete_middle
|
||||
assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
ListMixin.find(2).destroy
|
||||
|
||||
assert_equal [1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(1).pos
|
||||
assert_equal 2, ListMixin.find(3).pos
|
||||
assert_equal 3, ListMixin.find(4).pos
|
||||
|
||||
ListMixin.find(1).destroy
|
||||
|
||||
assert_equal [3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5000', :order => 'pos').map(&:id)
|
||||
|
||||
assert_equal 1, ListMixin.find(3).pos
|
||||
assert_equal 2, ListMixin.find(4).pos
|
||||
end
|
||||
|
||||
end
|
||||
Loading…
Add table
Add a link
Reference in a new issue