Class: ActiveRecord::Associations::HasAndBelongsToManyAssociation

Inherits:
AssociationCollection show all
Defined in:
lib/active_record/associations/has_and_belongs_to_many_association.rb

Overview

:nodoc:

Instance Attribute Summary

Attributes inherited from AssociationProxy

#reflection

Instance Method Summary collapse

Methods inherited from AssociationCollection

#<<, #clear, #create, #delete, #delete_all, #destroy_all, #empty?, #length, #replace, #reset, #to_ary, #uniq

Methods inherited from AssociationProxy

#===, #aliased_table_name, #conditions, #loaded, #loaded?, #proxy_respond_to?, #reload, #reset, #respond_to?, #target, #target=

Constructor Details

#initialize(owner, reflection) ⇒ HasAndBelongsToManyAssociation

Returns a new instance of HasAndBelongsToManyAssociation.



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 4

def initialize(owner, reflection)
  super
  construct_sql
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (protected) 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 79

def method_missing(method, *args, &block)
  if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
    super
  else
    @reflection.klass.with_scope(:find => { :conditions => @finder_sql, :joins => @join_sql, :readonly => false }) do
      @reflection.klass.send(method, *args, &block)
    end
  end
end

Instance Method Details

#build(attributes = {}) ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 9

def build(attributes = {})
  load_target
  record = @reflection.klass.new(attributes)
  @target << record
  record
end

#find(*args) ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 20

def find(*args)
  options = Base.send(:extract_options_from_args!, args)

  # If using a custom finder_sql, scan the entire collection.
  if @reflection.options[:finder_sql]
    expects_array = args.first.kind_of?(Array)
    ids = args.flatten.compact.uniq

    if ids.size == 1
      id = ids.first.to_i
      record = load_target.detect { |record| id == record.id }
      expects_array ? [record] : record
    else
      load_target.select { |record| ids.include?(record.id) }
    end
  else
    conditions = "#{@finder_sql}"

    if sanitized_conditions = sanitize_sql(options[:conditions])
      conditions << " AND (#{sanitized_conditions})"
    end

    options[:conditions] = conditions
    options[:joins]      = @join_sql
    options[:readonly]   = finding_with_ambigious_select?(options[:select])

    if options[:order] && @reflection.options[:order]
      options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
    elsif @reflection.options[:order]
      options[:order] = @reflection.options[:order]
    end

    merge_options_from_reflection!(options)

    # Pass through args exactly as we received them.
    args << options
    @reflection.klass.find(*args)
  end
end

#find_first ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 16

def find_first
  load_target.first
end

#push_with_attributes(record, join_attributes = {}) ⇒ Object Also known as: concat_with_attributes 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 60

def push_with_attributes(record, join_attributes = {})
  raise_on_type_mismatch(record)
  join_attributes.each { |key, value| record[key.to_s] = value }

  callback(:before_add, record)
  insert_record(record) unless @owner.new_record?
  @target << record
  callback(:after_add, record)

  self
end

#size ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 74

def size
  @reflection.options[:uniq] ? count_records : super
end