diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/class_methods/join_dependency/join_part.rb')
-rw-r--r-- | activerecord/lib/active_record/associations/class_methods/join_dependency/join_part.rb | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/activerecord/lib/active_record/associations/class_methods/join_dependency/join_part.rb b/activerecord/lib/active_record/associations/class_methods/join_dependency/join_part.rb deleted file mode 100644 index cd16ae5a8b..0000000000 --- a/activerecord/lib/active_record/associations/class_methods/join_dependency/join_part.rb +++ /dev/null @@ -1,80 +0,0 @@ -module ActiveRecord - module Associations - module ClassMethods - class JoinDependency # :nodoc: - # A JoinPart represents a part of a JoinDependency. It is an abstract class, 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: - # 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 :active_record - - delegate :table_name, :column_names, :primary_key, :reflections, :arel_engine, :to => :active_record - - def initialize(active_record) - @active_record = active_record - @cached_record = {} - @column_names_with_alias = nil - end - - def aliased_table - Arel::Nodes::TableAlias.new aliased_table_name, table - end - - def ==(other) - raise NotImplementedError - end - - # An Arel::Table for the active_record - def table - raise NotImplementedError - end - - # The prefix to be used when aliasing columns in the active_record's table - def aliased_prefix - raise NotImplementedError - end - - # The alias for the active_record's table - def aliased_table_name - raise NotImplementedError - end - - # The alias for the primary key of the active_record's table - def aliased_primary_key - "#{aliased_prefix}_r0" - end - - # An array of [column_name, alias] pairs for the table - def column_names_with_alias - unless @column_names_with_alias - @column_names_with_alias = [] - - ([primary_key] + (column_names - [primary_key])).each_with_index do |column_name, i| - @column_names_with_alias << [column_name, "#{aliased_prefix}_r#{i}"] - end - end - @column_names_with_alias - end - - def extract_record(row) - Hash[column_names_with_alias.map{|cn, an| [cn, row[an]]}] - end - - def record_id(row) - row[aliased_primary_key] - end - - def instantiate(row) - @cached_record[record_id(row)] ||= active_record.send(:instantiate, extract_record(row)) - end - end - end - end - end -end |