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.



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# File 'lib/active_record/associations.rb', line 1549

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.



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# File 'lib/active_record/associations.rb', line 1546

def active_record
  @active_record
end

#table_joins ⇒ Object (readonly)

Returns the value of attribute table_joins.



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# File 'lib/active_record/associations.rb', line 1546

def table_joins
  @table_joins
end

Instance Method Details

#aliased_prefix ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1555

def aliased_prefix
  "t0"
end

#aliased_primary_key ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1559

def aliased_primary_key
  "#{ aliased_prefix }_r0"
end

#aliased_table_name ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1563

def aliased_table_name
  active_record.table_name
end

#column_names_with_alias ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1567

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 



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# File 'lib/active_record/associations.rb', line 1579

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

#instantiate(row) ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1587

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

#record_id(row) ⇒ Object 



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# File 'lib/active_record/associations.rb', line 1583

def record_id(row)
  row[aliased_primary_key]
end