How to create a custom CSV formatter?

[Jose Piccioni]

Hi there,

I am not being able to find clear documentation on how to create a custom formatter. Where should I put that code (assuming a rails app)?

How would a csv formatter look like (even a superbasic) one. I intend to build a simple get endpoint that returns entities (using grape-entities) in a CSV file:

something like:
name, age, gender

Bob,34,male

Lisa,25,female

This is my endpoint:

     content_type :csv, 'text/csv'                                              

     default_format :csv               

                                               

     # ---------------------------                                              

     # GET /api/public/users                                            

     # ---------------------------                                  

                                                                    

     desc 'Return users as csv'

                  

     get '/' do                          

       header['Content-Disposition'] = 'attachment; filename=file.csv'

       present [Users.all], with: UsersEntity 

     end                     

Regards,

Jose.

[Daniel D.]

Start by not mixing entities and present and one of the many to_csv gems (haven't tried a specific one) that lets you just do "to_csv" on the ActiveRecord result, so:

content_type :csv, "application/csv"

formatter :csv, ->(object, env) { object.to_csv }

If you have a working result maybe contribute it to https://github.com/ruby-grape/grape-on-rack or https://github.com/ruby-grape/grape-on-rails for the next person. I can help in a pull request if you get stuck too. 

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