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define the delegate methods on one line. fixes #13724

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This commit is contained in:
Aaron Patterson 2014-01-16 11:55:48 -08:00
parent 73ba2c14cd
commit 44c51fc9cc
2 changed files with 32 additions and 20 deletions
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42
activesupport/lib/active_support/core_ext/module/delegation.rb
View file

@ -178,30 +178,32 @@ class Module
# whereas conceptually, from the user point of view, the delegator should
# be doing one call.
if allow_nil
module_eval(<<-EOS, file, line - 3)
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
EOS
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}")
module_eval(<<-EOS, file, line - 2)
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
EOS
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
module_eval(method_def, file, line)
end
end
end

10
activesupport/test/core_ext/module_test.rb
View file

@ -245,6 +245,16 @@ class ModuleTest < ActiveSupport::TestCase
end
end
def test_delegation_line_number
file, line = Someone.instance_method(:foo).source_location
assert_equal Someone::FAILED_DELEGATE_LINE, line
end
def test_delegate_line_with_nil
file, line = Someone.instance_method(:bar).source_location
assert_equal Someone::FAILED_DELEGATE_LINE_2, line
end
def test_delegation_exception_backtrace
someone = Someone.new("foo", "bar")
someone.foo