Refactoring: How to efficiently render json in Rails update action -

how can refactor code don't repeat json objects on , on again when use same basic format? i'm still bit uncomfortable ruby on rails i'm unsure of best way approach this.

  # put /users/:user_id/profile/:id   def update     if request.xhr?       profile = current_user.profile        if params[:profile].blank?         render :json => { :error => "there no profile data passed in profile not saved." },                 :status => :unprocessable_entity       else         if profile.update_attributes(params[:profile])           render :json => { :interests =>                                simple_format(h(profile.interests), :class => "pbs tl"),                             :favorite_music =>                               simple_format(h(profile.favorite_music), :class => "pbs tl"),                             :favorite_movies =>                               simple_format(h(profile.favorite_movies), :class => "pbs tl"),                             :favorite_books =>                               simple_format(h(profile.favorite_books), :class => "pbs tl"),                             :favorite_foods =>                               simple_format(h(profile.favorite_foods), :class => "pbs tl") },                  :status => :ok         else           render :json => { :error => get_errors_for_class(profile).to_sentence },                   :status => :unprocessable_entity         end       end     end   end 

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update: modified original answer little , works me. here's modification:

  # within profile.rb   # create hash of profile attributes   def html_to_hash     %w{interests favorite_music favorite_books favorite_foods}.inject({}) |hash, property|       hash[property] = simple_format(h(self.send(property)), :class => 'pbs tl')       hash     end       end 

make data in huge hash method of profile.

class profile   def to_hash     [:interests, :favorite_music, :favorite_books, :favorite_foods].inject({}) |h, prop|       h[prop] = simple_format(h(self.send(:prop)), :class => 'pbs tl')       h     end   end end 

then

# put /users/:user_id/profile/:id   def update     if request.xhr?       profile = current_user.profile        if params[:profile].blank?         render :json => { :error => "there no profile data passed in profile not saved." },                 :status => :unprocessable_entity       else         if profile.update_attributes(params[:profile])           render :json => profile.to_hash,                  :status => :ok         else           render :json => { :error => get_errors_for_class(profile).to_sentence },                   :status => :unprocessable_entity         end       end     end   end