47 lines
1.6 KiB
Ruby
47 lines
1.6 KiB
Ruby
|
# 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
|
||
|
|
end
|