42 lines
1.3 KiB
Ruby
42 lines
1.3 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
require 'spec_helper'
|
|
|
|
RSpec.describe Gitlab::SQL::Union do
|
|
let(:relation_1) { User.where(email: 'alice@example.com').select(:id) }
|
|
let(:relation_2) { User.where(email: 'bob@example.com').select(:id) }
|
|
|
|
def to_sql(relation)
|
|
relation.reorder(nil).to_sql
|
|
end
|
|
|
|
describe '#to_sql' do
|
|
it 'returns a String joining relations together using a UNION' do
|
|
union = described_class.new([relation_1, relation_2])
|
|
|
|
expect(union.to_sql).to eq("(#{to_sql(relation_1)})\nUNION\n(#{to_sql(relation_2)})")
|
|
end
|
|
|
|
it 'skips Model.none segements' do
|
|
empty_relation = User.none
|
|
union = described_class.new([empty_relation, relation_1, relation_2])
|
|
|
|
expect {User.where("users.id IN (#{union.to_sql})").to_a}.not_to raise_error
|
|
expect(union.to_sql).to eq("(#{to_sql(relation_1)})\nUNION\n(#{to_sql(relation_2)})")
|
|
end
|
|
|
|
it 'uses UNION ALL when removing duplicates is disabled' do
|
|
union = described_class
|
|
.new([relation_1, relation_2], remove_duplicates: false)
|
|
|
|
expect(union.to_sql).to include('UNION ALL')
|
|
end
|
|
|
|
it 'returns `NULL` if all relations are empty' do
|
|
empty_relation = User.none
|
|
union = described_class.new([empty_relation, empty_relation])
|
|
|
|
expect(union.to_sql).to eq('NULL')
|
|
end
|
|
end
|
|
end
|