rails doesn't know about "application/vnd.api+json" (ActionController::UnknownFormat)

Question

How to I solve this error I get in rails development.log:

ActionController::UnknownFormat (PostsController#index is missing a template for this request format and variant.

request.formats: ["application/vnd.api+json"]
request.variant: []):

What I'm doing

I'm trying out the jsonapi resources gem with rails 5.1 with curl. There's a demo app https://github.com/cerebris/peeps for reference.

curl -i -H "Accept: application/vnd.api+json" -H 'Content-Type:application/vnd.api+json' 'http://localhost:3000/posts?user_email=example@example.net&user_token=ZuqysdFsH5pfhAUTDpe3'

its been so long I actually forgot how I solved it, nowadays I use rails 6-0-stable maybe that's what you need. — american-ninja-warrior, Jul 04 '20 at 16:24
the problem is I can't jump to 6-0-stable, it's a big application and upgrading will create different problems, I am currently on 4.1.15 — Sunil Lulla, Jul 04 '20 at 18:17

score 2 · Answer 1 · answered Jan 22 '18 at 11:01

You probably need to register the mime type ("application/vnd.api+json") here: https://github.com/cerebris/peeps/blob/master/config/initializers/mime_types.rb

Note that the correct mimetype for json is "application/json", changing your curl command to using the standard mime type might even work out of the box.

rails doesn't know about "application/vnd.api+json" (ActionController::UnknownFormat)

1 Answers1