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require 'spec_helper'
describe Gitlab::SQL::RecursiveCTE, :postgresql do
let(:cte) { described_class.new(:cte_name) }
describe '#to_arel' do
it 'generates an Arel relation for the CTE body' do
rel1 = User.where(id: 1)
rel2 = User.where(id: 2)
cte << rel1
cte << rel2
sql = cte.to_arel.to_sql
name = ActiveRecord::Base.connection.quote_table_name(:cte_name)
sql1, sql2 = ActiveRecord::Base.connection.unprepared_statement do
[rel1.except(:order).to_sql, rel2.except(:order).to_sql]
end
expect(sql).to eq("#{name} AS (#{sql1}\nUNION\n#{sql2})")
end
end
describe '#alias_to' do
it 'returns an alias for the CTE' do
table = Arel::Table.new(:kittens)
source_name = ActiveRecord::Base.connection.quote_table_name(:cte_name)
alias_name = ActiveRecord::Base.connection.quote_table_name(:kittens)
expect(cte.alias_to(table).to_sql).to eq("#{source_name} AS #{alias_name}")
end
it 'replaces dots with an underscore' do
table = Arel::Table.new('gitlab.kittens')
source_name = ActiveRecord::Base.connection.quote_table_name(:cte_name)
alias_name = ActiveRecord::Base.connection.quote_table_name(:gitlab_kittens)
expect(cte.alias_to(table).to_sql).to eq("#{source_name} AS #{alias_name}")
end
end
describe '#apply_to' do
it 'applies a CTE to an ActiveRecord::Relation' do
user = create(:user)
cte = described_class.new(:cte_name)
cte << User.where(id: user.id)
relation = cte.apply_to(User.all)
expect(relation.to_sql).to match(/WITH RECURSIVE.+cte_name/)
expect(relation.to_a).to eq(User.where(id: user.id).to_a)
end
end
end
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