Redmine 4.1.1

lib/generators/redmine_plugin_migration/USAGE

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+Description:
+    Generates a plugin migration.
+
+Examples:
+    bin/rails generate redmine_plugin_migration my_plugin add_new_column_to_table

lib/generators/redmine_plugin_migration/redmine_plugin_migration_generator.rb

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+# frozen_string_literal: true
+
+# Redmine - project management software
+# Copyright (C) 2006-2019  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+class RedminePluginMigrationGenerator < Rails::Generators::NamedBase
+  include Rails::Generators::Migration
+
+  source_root File.expand_path("../templates", __FILE__)
+  argument :migration, :type => :string
+
+  class << self
+    def next_migration_number(dirname)
+      next_migration_number = current_migration_number(dirname) + 1
+      ActiveRecord::Migration.next_migration_number(next_migration_number)
+    end
+  end
+
+  def create_migration_file
+    plugin_name = file_name.underscore
+    plugin_path = File.join(Redmine::Plugin.directory, plugin_name)
+    migration_template "migration.rb",
+                       "#{plugin_path}/db/migrate/#{@migration}.rb"
+  end
+end

lib/generators/redmine_plugin_migration/templates/migration.rb.tt

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+class <%= @migration_class_name %> < ActiveRecord::Migration[<%= ActiveRecord::Migration.current_version %>]
+  def change
+  end
+end