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# frozen_string_literal: true
require 'spec_helper'
describe FromUnion do
describe '.from_union' do
let(:model) do
Class.new(ActiveRecord::Base) do
self.table_name = 'users'
include FromUnion
end
end
it 'selects from the results of the UNION' do
query = model.from_union([model.where(id: 1), model.where(id: 2)])
expect(query.to_sql).to match(/FROM \(\(SELECT.+\)\nUNION\n\(SELECT.+\)\) users/m)
end
it 'supports the use of a custom alias for the sub query' do
query = model.from_union(
[model.where(id: 1), model.where(id: 2)],
alias_as: 'kittens'
)
expect(query.to_sql).to match(/FROM \(\(SELECT.+\)\nUNION\n\(SELECT.+\)\) kittens/m)
end
it 'supports keeping duplicate rows' do
query = model.from_union(
[model.where(id: 1), model.where(id: 2)],
remove_duplicates: false
)
expect(query.to_sql)
.to match(/FROM \(\(SELECT.+\)\nUNION ALL\n\(SELECT.+\)\) users/m)
end
end
end
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