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class AddForeignKeysToTodos < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
class Todo < ActiveRecord::Base
self.table_name = 'todos'
include EachBatch
end
BATCH_SIZE = 1000
DOWNTIME = false
disable_ddl_transaction!
def up
Todo.where('NOT EXISTS ( SELECT true FROM users WHERE id=todos.user_id )').each_batch(of: BATCH_SIZE) do |batch|
batch.delete_all
end
Todo.where('NOT EXISTS ( SELECT true FROM users WHERE id=todos.author_id )').each_batch(of: BATCH_SIZE) do |batch|
batch.delete_all
end
Todo.where('note_id IS NOT NULL AND NOT EXISTS ( SELECT true FROM notes WHERE id=todos.note_id )').each_batch(of: BATCH_SIZE) do |batch|
batch.delete_all
end
add_concurrent_foreign_key :todos, :users, column: :user_id, on_delete: :cascade
add_concurrent_foreign_key :todos, :users, column: :author_id, on_delete: :cascade
add_concurrent_foreign_key :todos, :notes, column: :note_id, on_delete: :cascade
end
def down
remove_foreign_key :todos, column: :user_id
remove_foreign_key :todos, column: :author_id
remove_foreign_key :todos, :notes
end
end
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