Ruby / Rails -- from where was a method was included? [duplicate]

Question

Is there a way to find out from where a method was included in Ruby / Ruby on Rails?

For example, from searching the Rails API I know that:

link_to comes from ActionView::Helpers::UrlHelper, and
pluralize come from ActionView::Helpers::TextHelper

But is there a way to find out in Ruby itself? i.e. inirb, or the Rails console?

You might want to read this also: stackoverflow.com/questions/3393096/… — Casper
– Casper, Commented Apr 25, 2012 at 22:50

Casper · Accepted Answer · 2012-04-25 22:37:32Z

3

Yes:

@object.method(:method_name)

For example:

@object.method(:pluralize)

edited Apr 25, 2012 at 22:37

Casper

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answered Apr 25, 2012 at 22:18

x1a4

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4 Comments

mjeppesen Over a year ago

@s = "error"; @s.pluralize(:method_name) doesn't give ActionView::Helpers::TextHelper, though. Have I misunderstood?

Casper Over a year ago

@MatthewJeppesen Try @s.method(:pluralize) :)

mjeppesen Over a year ago

@s.method(:pluralize) # => #<Method: String#pluralize> ...

x1a4 Over a year ago

@MatthewJeppesen That's the correct result. pluralize is a method added to String directly. You can see its definition here

Peter Brown · Accepted Answer · 2012-04-25 23:14:55Z

1

Whatever context you're in you can get the source location by using:

obj.method(:method).source_location

It won't give you exactly what you want, but the Rails core developers are good about properly namespacing things. The following example can be run from the rails console:

Time.method(:zone).source_location

["/Users/pete/.rvm/gems/ruby-1.9.2-p290@gemset/gems/activesupport-3.2.3/lib/active_support/core_ext/time/zones.rb", 9]

Then you can go to the Rails source and search for that file. Hint: type 't' on Github and start typing. It will bring you to that file and you can see that it is defined directly on the Time class.

answered Apr 25, 2012 at 23:14

Peter Brown

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