Pretty format my JSON output in Rails 4

Question

I am using pretty_generate in my controller, but I am getting the following error

'only generation of JSON objects or arrays allowed'

@celebrities = Celebrity.includes(:category)    
respond_to do |format|
  format.json { render json: JSON.pretty_generate(@celebrities.to_json(:include =>{:category => {:only => [:category]} })) }
end

I am not sure why I am getting this error

Step through it in the console, eg do @celebrities.to_json(:include =>{:category => {:only => [:category]} }), store the result in a variable, call JSON.pretty_generate on it etc. — Max Williams
– Max Williams, Commented Sep 7, 2015 at 13:23
@MaxWilliams Same error, do I need to add require json somewhere — saravana
– saravana, Commented Sep 7, 2015 at 13:30
possible duplicate of How can I "Pretty" format my JSON output in Ruby on Rails? — zwippie
– zwippie, Commented Sep 7, 2015 at 14:04

Amit Badheka · Accepted Answer · 2015-09-07 14:04:10Z

3

As the error suggest, only generation of JSON objects or arrays allowed. I guess you should try this.

@celebrities = Celebrity.includes(:category)    
respond_to do |format|
  format.json { render json: JSON.pretty_generate(JSON.parse(@celebrities.to_json(:include =>{:category => {:only => [:category]} })))}
end

answered Sep 7, 2015 at 14:04

Amit Badheka

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