diff options
| -rw-r--r-- | activesupport/CHANGELOG.md | 6 | ||||
| -rw-r--r-- | activesupport/lib/active_support/core_ext/module/delegation.rb | 38 | ||||
| -rw-r--r-- | activesupport/test/core_ext/module_test.rb | 2 |
3 files changed, 20 insertions, 26 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md index 79133c7a40..237d1d71ae 100644 --- a/activesupport/CHANGELOG.md +++ b/activesupport/CHANGELOG.md @@ -1,3 +1,9 @@ +* Fixed confusing `DelegationError` in `Module#delegate`. + + See #15186. + + *Vladimir Yarotsky* + * Fixed `ActiveSupport::Subscriber` so that no duplicate subscriber is created when a subscriber method is redefined. diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index f855833a24..e926392952 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -170,38 +170,26 @@ class Module # methods still accept two arguments. definition = (method =~ /[^\]]=$/) ? 'arg' : '*args, &block' - # The following generated methods call the target exactly once, storing + # The following generated method calls the target exactly once, storing # the returned value in a dummy variable. # # Reason is twofold: On one hand doing less calls is in general better. # On the other hand it could be that the target has side-effects, # whereas conceptually, from the user point of view, the delegator should # be doing one call. - if allow_nil - method_def = [ - "def #{method_prefix}#{method}(#{definition})", # def customer_name(*args, &block) - "_ = #{to}", # _ = client - "if !_.nil? || nil.respond_to?(:#{method})", # if !_.nil? || nil.respond_to?(:name) - " _.#{method}(#{definition})", # _.name(*args, &block) - "end", # end - "end" # end - ].join ';' - else - exception = %(raise DelegationError, "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}") - method_def = [ - "def #{method_prefix}#{method}(#{definition})", # def customer_name(*args, &block) - " _ = #{to}", # _ = client - " _.#{method}(#{definition})", # _.name(*args, &block) - "rescue NoMethodError => e", # rescue NoMethodError => e - " if _.nil? && e.name == :#{method}", # if _.nil? && e.name == :name - " #{exception}", # # add helpful message to the exception - " else", # else - " raise", # raise - " end", # end - "end" # end - ].join ';' - end + exception = %(raise DelegationError, "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}") + + method_def = [ + "def #{method_prefix}#{method}(#{definition})", + " _ = #{to}", + " if !_.nil? || nil.respond_to?(:#{method})", + " _.#{method}(#{definition})", + " else", + " #{exception unless allow_nil}", + " end", + "end" + ].join ';' module_eval(method_def, file, line) end diff --git a/activesupport/test/core_ext/module_test.rb b/activesupport/test/core_ext/module_test.rb index ff6e21854e..380f5ad42b 100644 --- a/activesupport/test/core_ext/module_test.rb +++ b/activesupport/test/core_ext/module_test.rb @@ -72,7 +72,7 @@ Product = Struct.new(:name) do def type @type ||= begin - nil.type_name + :thing_without_same_method_name_as_delegated.name end end end |