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# frozen_string_literal: true
module ActiveRecord
module Associations
class JoinDependency # :nodoc:
# A JoinPart represents a part of a JoinDependency. It is inherited
# by JoinBase and JoinAssociation. A JoinBase represents the Active Record which
# everything else is being joined onto. A JoinAssociation represents an association which
# is joining to the base. A JoinAssociation may result in more than one actual join
# operations (for example a has_and_belongs_to_many JoinAssociation would result in
# two; one for the join table and one for the target table).
class JoinPart # :nodoc:
include Enumerable
# The Active Record class which this join part is associated 'about'; for a JoinBase
# this is the actual base model, for a JoinAssociation this is the target model of the
# association.
attr_reader :base_klass, :children
delegate :table_name, :column_names, :primary_key, to: :base_klass
def initialize(base_klass, children)
@base_klass = base_klass
@children = children
end
def match?(other)
self.class == other.class
end
def each(&block)
yield self
children.each { |child| child.each(&block) }
end
# An Arel::Table for the active_record
def table
raise NotImplementedError
end
# The alias for the active_record's table
def aliased_table_name
raise NotImplementedError
end
def extract_record(row, column_names_with_alias)
# This code is performance critical as it is called per row.
# see: https://github.com/rails/rails/pull/12185
hash = {}
index = 0
length = column_names_with_alias.length
while index < length
column_name, alias_name = column_names_with_alias[index]
hash[column_name] = row[alias_name]
index += 1
end
hash
end
def instantiate(row, aliases, &block)
base_klass.instantiate(extract_record(row, aliases), &block)
end
end
end
end
end
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