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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Usage::Metrics::NamesSuggestions::RelationParsers::Joins do
describe '#accept' do
let(:collector) { Arel::Collectors::SubstituteBinds.new(ActiveRecord::Base.connection, Arel::Collectors::SQLString.new) }
context 'with join added via string' do
it 'collects join parts' do
arel = Issue.joins('LEFT JOIN projects ON projects.id = issue.project_id')
arel = arel.arel
result = described_class.new(ApplicationRecord.connection).accept(arel)
expect(result).to match_array [{ source: "projects", constraints: "projects.id = issue.project_id" }]
end
end
context 'with join added via arel node' do
it 'collects join parts' do
source_table = Arel::Table.new('records')
joined_table = Arel::Table.new('joins')
second_level_joined_table = Arel::Table.new('second_level_joins')
arel = source_table
.from
.project(source_table['id'].count)
.join(joined_table, Arel::Nodes::OuterJoin)
.on(source_table[:id].eq(joined_table[:records_id]))
.join(second_level_joined_table, Arel::Nodes::OuterJoin)
.on(joined_table[:id].eq(second_level_joined_table[:joins_id]))
result = described_class.new(ApplicationRecord.connection).accept(arel)
expect(result).to match_array [{ source: "joins", constraints: "records.id = joins.records_id" }, { source: "second_level_joins", constraints: "joins.id = second_level_joins.joins_id" }]
end
end
end
end
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