Class: ActiveRecord::Associations::ClassMethods::JoinDependency::JoinBase

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/associations.rb

Overview

:nodoc:

Direct Known Subclasses

JoinAssociation

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(active_record, joins = nil) ⇒ JoinBase

Returns a new instance of JoinBase.



1979
1980
1981
1982
1983
 
# File 'lib/active_record/associations.rb', line 1979

def initialize(active_record, joins = nil)
  @active_record = active_record
  @cached_record = {}
  @table_joins   = joins
end

Instance Attribute Details

#active_record ⇒ Object (readonly)

Returns the value of attribute active_record.



1976
1977
1978
 
# File 'lib/active_record/associations.rb', line 1976

def active_record
  @active_record
end

#table_joins ⇒ Object (readonly)

Returns the value of attribute table_joins.



1976
1977
1978
 
# File 'lib/active_record/associations.rb', line 1976

def table_joins
  @table_joins
end

Instance Method Details

#aliased_prefix ⇒ Object 



1985
1986
1987
 
# File 'lib/active_record/associations.rb', line 1985

def aliased_prefix
  "t0"
end

#aliased_primary_key ⇒ Object 



1989
1990
1991
 
# File 'lib/active_record/associations.rb', line 1989

def aliased_primary_key
  "#{aliased_prefix}_r0"
end

#aliased_table_name ⇒ Object 



1993
1994
1995
 
# File 'lib/active_record/associations.rb', line 1993

def aliased_table_name
  active_record.table_name
end

#column_names_with_alias ⇒ Object 



1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
 
# File 'lib/active_record/associations.rb', line 1997

def column_names_with_alias
  unless defined?(@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

#extract_record(row) ⇒ Object 



2009
2010
2011
 
# File 'lib/active_record/associations.rb', line 2009

def extract_record(row)
  column_names_with_alias.inject({}){|record, (cn, an)| record[cn] = row[an]; record}
end

#instantiate(row) ⇒ Object 



2017
2018
2019
 
# File 'lib/active_record/associations.rb', line 2017

def instantiate(row)
  @cached_record[record_id(row)] ||= active_record.send(:instantiate, extract_record(row))
end

#record_id(row) ⇒ Object 



2013
2014
2015
 
# File 'lib/active_record/associations.rb', line 2013

def record_id(row)
  row[aliased_primary_key]
end