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uniq preserves order. References [4325].

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4326 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Jeremy Kemper 2006-05-07 02:03:25 +00:00
parent 50f538b72b
commit d59f3a78a4
3 changed files with 19 additions and 8 deletions
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9
activerecord/lib/active_record/associations/association_collection.rb
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@ -109,7 +109,14 @@ def empty?
end
def uniq(collection = self)
collection.to_set.to_a
seen = Set.new
collection.inject([]) do |kept, record|
unless seen.include?(record.id)
kept << record
seen << record.id
end
kept
end
end
# Replace this collection with +other_array+

15
activerecord/test/associations_test.rb
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@ -1278,17 +1278,20 @@ def test_habtm_adding_before_save_with_join_attributes
def test_habtm_saving_multiple_relationships
new_project = Project.new("name" => "Grimetime")
amount_of_developers = 4
developers = (0..amount_of_developers).collect {|i| Developer.create(:name => "JME #{i}") }
developers = (0...amount_of_developers).collect {|i| Developer.create(:name => "JME #{i}") }.reverse
new_project.developer_ids = [developers[0].id, developers[1].id]
new_project.developers_with_callback_ids = [developers[2].id, developers[3].id]
assert new_project.save
new_project.reload
assert_equal amount_of_developers, new_project.developers.size
amount_of_developers.times do |i|
assert_equal developers[i].name, new_project.developers[i].name
end
assert_equal developers, new_project.developers
end
def test_habtm_unique_order_preserved
assert_equal [developers(:poor_jamis), developers(:jamis), developers(:david)], projects(:active_record).non_unique_developers
assert_equal [developers(:poor_jamis), developers(:jamis), developers(:david)], projects(:active_record).developers
end
def test_build

3
activerecord/test/fixtures/project.rb vendored
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@ -1,5 +1,6 @@
class Project < ActiveRecord::Base
has_and_belongs_to_many :developers, :uniq => true
has_and_belongs_to_many :developers, :uniq => true, :order => 'developers.name desc, developers.id desc'
has_and_belongs_to_many :non_unique_developers, :order => 'developers.name desc, developers.id desc', :class_name => 'Developer'
has_and_belongs_to_many :limited_developers, :class_name => "Developer", :limit => 1
has_and_belongs_to_many :developers_named_david, :class_name => "Developer", :conditions => "name = 'David'", :uniq => true
has_and_belongs_to_many :salaried_developers, :class_name => "Developer", :conditions => "salary > 0"