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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Pagination::Keyset::InOperatorOptimization::Strategies::RecordLoaderStrategy do
let(:finder_query) { -> (created_at_value, id_value) { Project.where(Project.arel_table[:id].eq(id_value)) } }
let(:model) { Project }
let(:keyset_scope) do
scope, _ = Gitlab::Pagination::Keyset::SimpleOrderBuilder.build(
Project.order(:created_at, :id)
)
scope
end
let(:keyset_order) do
Gitlab::Pagination::Keyset::Order.extract_keyset_order_object(keyset_scope)
end
let(:order_by_columns) do
Gitlab::Pagination::Keyset::InOperatorOptimization::OrderByColumns.new(keyset_order.column_definitions, model.arel_table)
end
subject(:strategy) { described_class.new(finder_query, model, order_by_columns) }
describe '#initializer_columns' do
# Explanation:
# > SELECT NULL::projects AS records
#
# The query returns one row and one column. The column may contain a full project row.
# In this particular case the row is NULL.
it 'returns a NULL table row as the result column' do
expect(strategy.initializer_columns).to eq(["NULL::projects AS records"])
end
end
describe '#columns' do
# Explanation:
# > SELECT (SELECT projects FROM projects limit 1)
#
# Selects one row from the database and collapses it into one column.
#
# Side note: Due to the type casts, columns and initializer_columns can be also UNION-ed:
# SELECT * FROM (
# (
# SELECT NULL::projects AS records
# UNION
# SELECT (SELECT projects FROM projects limit 1)
# )
# ) as records
it 'uses the finder query to load the row in the result column' do
expected_loader_query = <<~SQL
(SELECT projects FROM "projects" WHERE "projects"."id" = recursive_keyset_cte.projects_id_array[position] LIMIT 1)
SQL
expect(strategy.columns).to eq([expected_loader_query.chomp])
end
end
end
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