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# frozen_string_literal: true
module Gitlab
module Pagination
module Keyset
module InOperatorOptimization
module Strategies
class RecordLoaderStrategy
RECORDS_COLUMN = 'records'
def initialize(finder_query, model, order_by_columns)
verify_order_by_attributes_on_model!(model, order_by_columns)
@finder_query = finder_query
@order_by_columns = order_by_columns
@table_name = model.table_name
end
def initializer_columns
["NULL::#{table_name} AS #{RECORDS_COLUMN}"]
end
def columns
query = finder_query
.call(*order_by_columns.array_lookup_expressions_by_position(QueryBuilder::RECURSIVE_CTE_NAME))
.select("#{table_name}")
.limit(1)
["(#{query.to_sql})"]
end
def final_projections
["(#{RECORDS_COLUMN}).*"]
end
private
attr_reader :finder_query, :order_by_columns, :table_name
def verify_order_by_attributes_on_model!(model, order_by_columns)
order_by_columns.map(&:column).each do |column|
next if model.columns_hash[column.attribute_name.to_s]
text = <<~TEXT
The "RecordLoaderStrategy" does not support the following ORDER BY column because
it's not available on the \"#{model.table_name}\" table: #{column.attribute_name}
Omit the "finder_query" parameter to use the "OrderValuesLoaderStrategy".
TEXT
raise text
end
end
end
end
end
end
end
end
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