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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::SharedModel do
describe 'using an external connection' do
let!(:original_connection) { described_class.connection }
let(:new_connection) { double('connection') }
it 'overrides the connection for the duration of the block', :aggregate_failures do
expect_original_connection_around do
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
end
end
end
it 'does not affect connections in other threads', :aggregate_failures do
expect_original_connection_around do
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
Thread.new do
expect(described_class.connection).not_to be(new_connection)
end.join
end
end
end
context 'when multiple connection overrides are nested', :aggregate_failures do
let(:second_connection) { double('connection') }
it 'allows the nesting with the same connection object' do
expect_original_connection_around do
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
end
expect(described_class.connection).to be(new_connection)
end
end
end
it 'raises an error if the connection is changed' do
expect_original_connection_around do
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
expect do
described_class.using_connection(second_connection) {}
end.to raise_error(/Cannot change connection for Gitlab::Database::SharedModel/)
expect(described_class.connection).to be(new_connection)
end
end
end
end
context 'when the block raises an error', :aggregate_failures do
it 're-raises the error, removing the overridden connection' do
expect_original_connection_around do
expect do
described_class.using_connection(new_connection) do
expect(described_class.connection).to be(new_connection)
raise 'here comes an error!'
end
end.to raise_error(RuntimeError, 'here comes an error!')
end
end
end
def expect_original_connection_around
# For safety, ensure our original connection is distinct from our double
# This should be the case, but in case of something leaking we should verify
expect(original_connection).not_to be(new_connection)
expect(described_class.connection).to be(original_connection)
yield
expect(described_class.connection).to be(original_connection)
end
end
describe '#connection_db_config' do
it 'returns the class connection_db_config' do
shared_model_class = Class.new(described_class) do
self.table_name = 'postgres_async_indexes'
end
shared_model = shared_model_class.new
expect(shared_model.connection_db_config). to eq(described_class.connection_db_config)
end
end
end
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