OpenProject is the leading open source project management software.
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openproject/db/migrate/20130813062401_add_attachab...

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class AddAttachableJournal < ActiveRecord::Migration
def change
create_table :attachable_journals, id: false do |t|
t.integer :journal_id, null: false
t.integer :attachment_id, null: false
t.string :filename, :default => '', :null => false
end
add_index :attachable_journals, :journal_id
add_index :attachable_journals, [:journal_id, :attachment_id], unqiue: true
end
end