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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::TablesSortedByForeignKeys do
let(:connection) { ApplicationRecord.connection }
let(:tables) { %w[_test_gitlab_main_items _test_gitlab_main_references] }
subject do
described_class.new(connection, tables).execute
end
before do
statement = <<~SQL
CREATE TABLE _test_gitlab_main_items (id serial NOT NULL PRIMARY KEY);
CREATE TABLE _test_gitlab_main_references (
id serial NOT NULL PRIMARY KEY,
item_id BIGINT NOT NULL,
CONSTRAINT fk_constrained_1 FOREIGN KEY(item_id) REFERENCES _test_gitlab_main_items(id)
);
SQL
connection.execute(statement)
end
describe '#execute' do
it 'returns the tables sorted by the foreign keys dependency' do
expect(subject).to eq([['_test_gitlab_main_references'], ['_test_gitlab_main_items']])
end
it 'returns both tables together if they are strongly connected' do
statement = <<~SQL
ALTER TABLE _test_gitlab_main_items ADD COLUMN reference_id BIGINT
REFERENCES _test_gitlab_main_references(id)
SQL
connection.execute(statement)
expect(subject).to eq([tables])
end
end
end
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