Dynamic options to to_json #7

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1. dblock commented on Oct 24, 2014

   

   dblock

   on Oct 24, 2014

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   Does as_json work? I think to_json is defined by some other gem as basically as_json.to_s.

   I use a custom representer to always force Grape's present ... to return JSON like so:

   module Grape
     module Roar
       module Representer
         def self.included(base)
           base.extend(ClassMethods)
         end
   
         module ClassMethods
           def represent(object, options = {})
             object.extend self
             # our own version of Grape::Roar::Representer
             # returns a serializable object
             object.to_json(options)
           end
         end
       end
     end
   end

   This is related to https://github.com/dblock/grape-roar/issues/3.
2. dblock

   added

   question

   on Oct 24, 2014
3. dblock

   closed this as completedin #44on Oct 27, 2026
4. dblock commented on Oct 27, 2026

   

   dblock

   on Oct 27, 2026

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   Implemented in #44, now merged. The README documents request-specific Roar rendering options using a native Hash response:

   ProductRepresenter.represent(product).to_hash(
     wrap: :product,
     user_options: { env: env, student: current_student }
   )

   This works with modules and decorators. Roar receives wrap, while callbacks receive student and the request environment. Returning the Hash lets the formatter encode the response once; returning to_json would double-encode it. Arbitrary options passed to Grape’s present are not forwarded to the later rendering step.

   See Dynamic Rendering Options.

   Posted by Copilot, an AI, on behalf of @dblock.