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# frozen_string_literal: true
RSpec.shared_examples 'from set operator' do |sql_klass|
from_set_operator_concern = described_class
operator_keyword = sql_klass.operator_keyword
operator_method = "from_#{sql_klass.operator_keyword.downcase}"
describe "##{operator_method}" do
let(:model) do
Class.new(ActiveRecord::Base) do
self.table_name = 'users'
include from_set_operator_concern
end
end
it "selects from the results of the #{operator_keyword}" do
query = model.public_send(operator_method, [model.where(id: 1), model.where(id: 2)])
expect(query.to_sql).to match(/FROM \(\(SELECT.+\)\n#{operator_keyword}\n\(SELECT.+\)\) users/m)
end
it 'supports the use of a custom alias for the sub query' do
query = model.public_send(operator_method,
[model.where(id: 1), model.where(id: 2)],
alias_as: 'kittens'
)
expect(query.to_sql).to match(/FROM \(\(SELECT.+\)\n#{operator_keyword}\n\(SELECT.+\)\) kittens/m)
end
it 'supports keeping duplicate rows' do
query = model.public_send(operator_method,
[model.where(id: 1), model.where(id: 2)],
remove_duplicates: false
)
expect(query.to_sql)
.to match(/FROM \(\(SELECT.+\)\n#{operator_keyword} ALL\n\(SELECT.+\)\) users/m)
end
end
end
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