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

#<<, #any?, #clear, #delete, #delete_all, #destroy_all, #empty?, #length, #replace, #reset, #size, #sum, #to_ary, #uniq

Methods inherited from AssociationProxy

#===, #aliased_table_name, #conditions, #inspect, #loaded, #loaded?, #proxy_owner, #proxy_reflection, #proxy_respond_to?, #proxy_target, #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 in the class ActiveRecord::Associations::AssociationCollection

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
  build_record(attributes)
end

#create(attributes = {}) ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 14

def create(attributes = {})
  create_record(attributes) { |record| insert_record(record) }
end

#create!(attributes = {}) ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 18

def create!(attributes = {})
  create_record(attributes) { |record| insert_record(record, true) }
end

#find(*args) ⇒ Object 



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# File 'lib/active_record/associations/has_and_belongs_to_many_association.rb', line 26

def find(*args)
  options = args.extract_options!

  # 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_ambiguous_select?(options[:select] || @reflection.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)

    options[:select] ||= (@reflection.options[:select] || '*')

    # 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 22

def find_first
  load_target.first
end