Class: ActiveRecord::Associations::AssociationCollection
- Inherits:
-
AssociationProxy
- Object
- AssociationProxy
- ActiveRecord::Associations::AssociationCollection
- Defined in:
- lib/active_record/associations/association_collection.rb
Overview
:nodoc:
Direct Known Subclasses
Instance Attribute Summary
Attributes inherited from AssociationProxy
Instance Method Summary collapse
-
#<<(*records) ⇒ Object
(also: #push, #concat)
Add
records
to this association. -
#clear ⇒ Object
Removes all records from this association.
- #create(attributes = {}) ⇒ Object
-
#delete(*records) ⇒ Object
Remove
records
from this association. -
#delete_all ⇒ Object
Remove all records from this association.
- #destroy_all ⇒ Object
- #empty? ⇒ Boolean
-
#length ⇒ Object
Returns the size of the collection by loading it and calling size on the array.
-
#replace(other_array) ⇒ Object
Replace this collection with
other_array
This will perform a diff and delete/add only records that have changed. - #reset ⇒ Object
-
#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.
-
#sum(*args, &block) ⇒ Object
Calculate sum using SQL, not Enumerable.
- #to_ary ⇒ Object
- #uniq(collection = self) ⇒ Object
Methods inherited from AssociationProxy
#===, #aliased_table_name, #conditions, #initialize, #loaded, #loaded?, #proxy_owner, #proxy_reflection, #proxy_respond_to?, #proxy_target, #reload, #respond_to?, #target, #target=
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 18 def <<(*records) result = true load_target @owner.transaction do flatten_deeper(records).each do |record| raise_on_type_mismatch(record) callback(:before_add, record) result &&= insert_record(record) unless @owner.new_record? @target << record callback(:after_add, record) end end result && self end |
#clear ⇒ Object
Removes all records from this association. Returns self
so method calls may be chained.
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# File 'lib/active_record/associations/association_collection.rb', line 68 def clear return self if length.zero? # forces load_target if hasn't happened already if @reflection.[:dependent] && @reflection.[:dependent] == :delete_all destroy_all else delete_all end self end |
#create(attributes = {}) ⇒ Object
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# File 'lib/active_record/associations/association_collection.rb', line 88 def create(attributes = {}) # Can't use Base.create since the foreign key may be a protected attribute. if attributes.is_a?(Array) attributes.collect { |attr| create(attr) } else record = build(attributes) if @owner.new_record? ActiveSupport::Deprecation.warn("Calling .create on a has_many association without saving its owner will not work in rails 2.0, you probably want .build instead") else record.save end record end 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 51 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 records.each { |record| callback(:before_remove, record) } delete_records(records) records.each do |record| @target.delete(record) callback(:after_remove, record) end end end |
#delete_all ⇒ Object
Remove all records from this association
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# File 'lib/active_record/associations/association_collection.rb', line 39 def delete_all load_target delete(@target) reset_target! end |
#destroy_all ⇒ Object
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# File 'lib/active_record/associations/association_collection.rb', line 80 def destroy_all @owner.transaction do each { |record| record.destroy } end reset_target! end |
#empty? ⇒ Boolean
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# File 'lib/active_record/associations/association_collection.rb', line 123 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 119 def length load_target.size end |
#replace(other_array) ⇒ Object
Replace this collection with other_array
This will perform a diff and delete/add only records that have changed.
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# File 'lib/active_record/associations/association_collection.rb', line 140 def replace(other_array) other_array.each { |val| raise_on_type_mismatch(val) } load_target other = other_array.size < 100 ? other_array : other_array.to_set current = @target.size < 100 ? @target : @target.to_set @owner.transaction do delete(@target.select { |v| !other.include?(v) }) concat(other_array.select { |v| !current.include?(v) }) end end |
#reset ⇒ Object
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# File 'lib/active_record/associations/association_collection.rb', line 11 def reset 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 106 def size if loaded? && !@reflection.[:uniq] @target.size elsif !loaded? && !@reflection.[:uniq] && @target.is_a?(Array) unsaved_records = Array(@target.detect { |r| r.new_record? }) unsaved_records.size + count_records else count_records end end |
#sum(*args, &block) ⇒ Object
Calculate sum using SQL, not Enumerable
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# File 'lib/active_record/associations/association_collection.rb', line 46 def sum(*args, &block) calculate(:sum, *args, &block) end |
#to_ary ⇒ Object
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# File 'lib/active_record/associations/association_collection.rb', line 6 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 127 def uniq(collection = self) seen = Set.new collection.inject([]) do |kept, record| unless seen.include?(record.id) kept << record seen << record.id end kept end end |