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