[RUBY] What to do when you want to know the source position where the method is defined in binding.pry


When reading the ruby code

--Too little knowledge about the implicit part ――It's too complicated to understand

Sometimes I use a debugger.

However, in rare cases, I wanted to step in a method, but the description that I thought was an argument of that method was actually another method call, and I couldn't understand the call tree.

At that time, source_location that grows in class Method I finally came up with the idea of using the method, so make a note of it.


When running rspec, I tried to replace the redis client used in ʻActiveSupport :: Cache :: RedisCacheStore with a mock, but there is no method called with`, and an example of investigating the cause of the failure.

Line 345 becomes method_missing with redis.with. Looking at the redis gem, it seems that with is not defined. I wonder what.

From: /bundle/gems/activesupport- ActiveSupport::Cache::Strategy::LocalCache#read_entry:

    339:         # Store provider interface:
    340:         # Read an entry from the cache.
    341:         def read_entry(key, **options)
    342:           failsafe :read_entry do
    343:             binding.pry
 => 344:             raw = options&.fetch(:raw, false)
    345:             deserialize_entry(redis.with { |c| c.get(key) }, raw: raw)
    346:           end
    347:         end
    349:         def read_multi_entries(names, **options)

Stop replacing the mock, re-execute, and try to view the source.

[1] pry(#<ActiveSupport::Cache::RedisCacheStore>)> redis.method(:with).source
=> "      def with\n        yield self\n      end\n"

What is this method? In such a case, source_location!

[2] pry(#<ActiveSupport::Cache::RedisCacheStore>)> redis.method(:with).source_location
=> ["/bundle/gems/activesupport-", 24]

Is it here? https://github.com/rails/rails/blob/fbe2433be6e052a1acac63c7faf287c52ed3c5ba/activesupport/lib/active_support/cache/redis_cache_store.rb#L24-L26

Is it easy to use by including ConnectionPoolLike and patching Redis? I wonder if I have to include ConnectionPoolLike in the redis client that I plug in with a mock. If the implementation of ActiveSupport changes, I wonder if I can follow it properly.



If classes are opened in various places and the behavior can be changed, it may be difficult to notice just by reading the source. Finished.

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