Class: ActiveRecord::Associations::HasManyAssociation

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

Overview

:nodoc:

Instance Attribute Summary

Attributes inherited from AssociationProxy

#reflection

Instance Method Summary collapse

Methods inherited from AssociationCollection

#<<, #any?, #clear, #create, #create!, #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) ⇒ HasManyAssociation

Returns a new instance of HasManyAssociation.



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

def build(attributes = {})
  if attributes.is_a?(Array)
    attributes.collect { |attr| build(attr) }
  else
    build_record(attributes) { |record| set_belongs_to_association_for(record) }
  end
end

#count(*args) ⇒ Object

Count the number of associated records. All arguments are optional.



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

def count(*args)
  if @reflection.options[:counter_sql]
    @reflection.klass.count_by_sql(@counter_sql)
  elsif @reflection.options[:finder_sql]
    @reflection.klass.count_by_sql(@finder_sql)
  else
    column_name, options = @reflection.klass.send(:construct_count_options_from_args, *args)          
    options[:conditions] = options[:conditions].nil? ?
      @finder_sql :
      @finder_sql + " AND (#{sanitize_sql(options[:conditions])})"
    options[:include] ||= @reflection.options[:include]

    @reflection.klass.count(column_name, options)
  end
end

#find(*args) ⇒ Object 



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# File 'lib/active_record/associations/has_many_association.rb', line 34

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.map(&:to_i)

    if ids.size == 1
      id = ids.first
      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

    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