Class: ActiveRecord::Associations::AssociationCollection

Inherits:
AssociationProxy show all
Defined in:
lib/active_record/associations/association_collection.rb

Overview

:nodoc:

Instance Method Summary collapse

Methods inherited from AssociationProxy

#initialize, #loaded?, #method_missing, #proxy_respond_to?, #reload, #respond_to?

Constructor Details

This class inherits a constructor from ActiveRecord::Associations::AssociationProxy

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ActiveRecord::Associations::AssociationProxy

Instance Method Details

#<<(*records) ⇒ Object Also known as: push, concat

Add records to this association. Returns self so method calls may be chained.

Since << flattens its argument list and inserts each record, push and concat behave identically.



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

def <<(*records)
  result = true
  load_target
  @owner.transaction do
    flatten_deeper(records).each do |record|
      raise_on_type_mismatch(record)
      result &&= insert_record(record) unless @owner.new_record?
      @target << record
    end
  end

  result and self
end

#create(attributes = {}) ⇒ Object 



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# File 'lib/active_record/associations/association_collection.rb', line 54

def create(attributes = {})
  # Can't use Base.create since the foreign key may be a protected attribute.
  record = build(attributes)
  record.save unless @owner.new_record?
  record
end

#delete(*records) ⇒ Object

Remove records from this association. Does not destroy records.



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

def delete(*records)
  records = flatten_deeper(records)
  records.each { |record| raise_on_type_mismatch(record) }
  records.reject! { |record| @target.delete(record) if record.new_record? }
  return if records.empty?
  
  @owner.transaction do
    delete_records(records)
    records.each { |record| @target.delete(record) }
  end
end

#destroy_all ⇒ Object 



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# File 'lib/active_record/associations/association_collection.rb', line 46

def destroy_all
  @owner.transaction do
    each { |record| record.destroy }
  end

  @target = []
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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

def empty?
  size.zero?
end

#length ⇒ Object

Returns the size of the collection by loading it and calling size on the array. If you want to use this method to check whether the collection is empty, use collection.length.zero? instead of collection.empty?



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# File 'lib/active_record/associations/association_collection.rb', line 70

def length
  load_target.size
end

#replace(other_array) ⇒ Object 



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# File 'lib/active_record/associations/association_collection.rb', line 82

def replace(other_array)
  other_array.each{ |val| raise_on_type_mismatch(val) }

  @target = other_array
  @loaded = true
end

#reset ⇒ Object 



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

def reset
  @target = []
  @loaded = false
end

#size ⇒ Object

Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn’t been loaded and calling collection.size if it has. If it’s more likely than not that the collection does have a size larger than zero and you need to fetch that collection afterwards, it’ll take one less SELECT query if you use length.



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# File 'lib/active_record/associations/association_collection.rb', line 64

def size
  if loaded? then @target.size else count_records end
end

#to_ary ⇒ Object 



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

def to_ary
  load_target
  @target.to_ary
end

#uniq(collection = self) ⇒ Object 



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# File 'lib/active_record/associations/association_collection.rb', line 78

def uniq(collection = self)
  collection.inject([]) { |uniq_records, record| uniq_records << record unless uniq_records.include?(record); uniq_records }
end