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-rw-r--r--activemodel/CHANGELOG.md4
-rw-r--r--activemodel/lib/active_model/conversion.rb2
-rw-r--r--activemodel/test/cases/conversion_test.rb10
3 files changed, 15 insertions, 1 deletions
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 6585808fa2..500d8dc42f 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,7 @@
+* `#to_param` returns `nil` if `#to_key` returns `nil`. Fixes #11399.
+
+ *Yves Senn*
+
* Ability to specify multiple contexts when defining a validation.
Example:
diff --git a/activemodel/lib/active_model/conversion.rb b/activemodel/lib/active_model/conversion.rb
index 6b0a752566..0a19ef686d 100644
--- a/activemodel/lib/active_model/conversion.rb
+++ b/activemodel/lib/active_model/conversion.rb
@@ -62,7 +62,7 @@ module ActiveModel
# person = Person.create
# person.to_param # => "1"
def to_param
- persisted? ? to_key.join('-') : nil
+ (persisted? && key = to_key) ? key.join('-') : nil
end
# Returns a +string+ identifying the path associated with the object.
diff --git a/activemodel/test/cases/conversion_test.rb b/activemodel/test/cases/conversion_test.rb
index 3bb177591d..c5cfbf909d 100644
--- a/activemodel/test/cases/conversion_test.rb
+++ b/activemodel/test/cases/conversion_test.rb
@@ -24,6 +24,16 @@ class ConversionTest < ActiveModel::TestCase
assert_equal "1", Contact.new(id: 1).to_param
end
+ test "to_param returns nil if to_key is nil" do
+ klass = Class.new(Contact) do
+ def persisted?
+ true
+ end
+ end
+
+ assert_nil klass.new.to_param
+ end
+
test "to_partial_path default implementation returns a string giving a relative path" do
assert_equal "contacts/contact", Contact.new.to_partial_path
assert_equal "helicopters/helicopter", Helicopter.new.to_partial_path,