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- class AddUniqueIndexOnCustomFieldsProjects < ActiveRecord::Migration
- def up
- table_name = "#{CustomField.table_name_prefix}custom_fields_projects#{CustomField.table_name_suffix}"
- duplicates = CustomField.connection.select_rows("SELECT custom_field_id, project_id FROM #{table_name} GROUP BY custom_field_id, project_id HAVING COUNT(*) > 1")
- duplicates.each do |custom_field_id, project_id|
- # Removes duplicate rows
- CustomField.connection.execute("DELETE FROM #{table_name} WHERE custom_field_id=#{custom_field_id} AND project_id=#{project_id}")
- # And insert one
- CustomField.connection.execute("INSERT INTO #{table_name} (custom_field_id, project_id) VALUES (#{custom_field_id}, #{project_id})")
- end
-
- if index_exists? :custom_fields_projects, [:custom_field_id, :project_id]
- remove_index :custom_fields_projects, [:custom_field_id, :project_id]
- end
- add_index :custom_fields_projects, [:custom_field_id, :project_id], :unique => true
- end
-
- def down
- if index_exists? :custom_fields_projects, [:custom_field_id, :project_id]
- remove_index :custom_fields_projects, [:custom_field_id, :project_id]
- end
- add_index :custom_fields_projects, [:custom_field_id, :project_id]
- end
- end
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