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# frozen_string_literal: true
RSpec.shared_examples 'SQL set operator' do |operator_keyword|
operator_keyword = operator_keyword.upcase
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 '.operator_keyword' do
it { expect(described_class.operator_keyword).to eq operator_keyword }
end
describe '#to_sql' do
it "returns a String joining relations together using a #{operator_keyword}" do
set_operator = described_class.new([relation_1, relation_2])
expect(set_operator.to_sql).to eq("(#{to_sql(relation_1)})\n#{operator_keyword}\n(#{to_sql(relation_2)})")
end
it 'skips Model.none segements' do
empty_relation = User.none
set_operator = described_class.new([empty_relation, relation_1, relation_2])
expect {User.where("users.id IN (#{set_operator.to_sql})").to_a}.not_to raise_error
expect(set_operator.to_sql).to eq("(#{to_sql(relation_1)})\n#{operator_keyword}\n(#{to_sql(relation_2)})")
end
it "uses #{operator_keyword} ALL when removing duplicates is disabled" do
set_operator = described_class
.new([relation_1, relation_2], remove_duplicates: false)
expect(set_operator.to_sql).to include("#{operator_keyword} ALL")
end
it 'returns `NULL` if all relations are empty' do
empty_relation = User.none
set_operator = described_class.new([empty_relation, empty_relation])
expect(set_operator.to_sql).to eq('NULL')
end
end
describe 'remove_order parameter' do
let(:scopes) do
[
User.where(id: 1).order(id: :desc).limit(1),
User.where(id: 2).order(id: :asc).limit(1)
]
end
subject(:union_query) { described_class.new(scopes, remove_order: remove_order).to_sql }
context 'when remove_order: true' do
let(:remove_order) { true }
it 'removes the ORDER BY from the query' do
expect(union_query).not_to include('ORDER BY "users"."id" DESC')
expect(union_query).not_to include('ORDER BY "users"."id" ASC')
end
end
context 'when remove_order: false' do
let(:remove_order) { false }
it 'does not remove the ORDER BY from the query' do
expect(union_query).to include('ORDER BY "users"."id" DESC')
expect(union_query).to include('ORDER BY "users"."id" ASC')
end
end
end
end
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