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体验新版 GitCode,发现更多精彩内容 >>
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bf55f28a
编写于
5月 18, 2012
作者:
F
Francesco Rodriguez
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差异文件
add docs to CollectionAssociation#empty?
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+32
-3
activerecord/lib/active_record/associations/collection_association.rb
.../lib/active_record/associations/collection_association.rb
+32
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未找到文件。
activerecord/lib/active_record/associations/collection_association.rb
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bf55f28a
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@@ -298,9 +298,38 @@ def length
load_target
.
size
end
# Equivalent to <tt>collection.size.zero?</tt>. If the collection has
# not been already loaded and you are going to fetch the records anyway
# it is better to check <tt>collection.length.zero?</tt>.
# Returns true if the collection is empty. Equivalent to
# <tt>collection.size.zero?</tt>. If the collection has not been already
# loaded and you are going to fetch the records anyway it is better to
# check <tt>collection.length.zero?</tt>.
#
# class Person < ActiveRecord::Base
# has_many :pets
# end
#
# person.pets.count # => 1
# person.pets.empty? # => false
#
# person.pets.delete_all
# person.pets.count # => 0
# person.pets.empty? # => true
#
# Also, you can pass a block to define a criteria. The behaviour
# is the same, it returns true if the collection based on the
# criteria is empty.
#
# person.pets
# # => [#<Pet name: "Wy", group: "cats">]
#
# person.pets.empty? do |pet|
# pet.group == 'cats'
# end
# # => false
#
# person.pets.empty? do |pet|
# pet.group == 'dogs'
# end
# # => true
def
empty?
size
.
zero?
end
...
...
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