Rails: Restrict API requests to JSON format
Solution 1
Setting a default in your routes won't turn all requests into a JSON request.
What you want is to make sure that whatever you're rendering is a JSON response
You pretty much had it in the first option except you need to do this
before_filter :set_default_response_format
private
def set_default_response_format
request.format = :json
end
That would go under your Base API controller so that when it gets to your actual action the format will always be JSON.
Solution 2
If you want to return a 404, or raise a RouteNotFound error if the format is not :json
, I would add a route constraint like this:
Require JSON format:
# routes.rb
MyApp::Application.routes.draw do
namespace :api, constraints: { format: 'json' } do
namespace :v1 do
resources :posts
end
end
end
More information can be found here: http://edgeguides.rubyonrails.org/routing.html#request-based-constraints
Solution 3
Second option, using routes format. If a user explicitly requests a XML format, he should not receive a JSON response. He should get a message saying that this URL doesn't answer to XML format, or 404.
By the way, it would be rather easy to respond to all which is what you should do in my opinion.
class FooController
respond_to :xml, :json
def show
@bar = Bar.find(params[:id])
respond_with(@bar)
end
end
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JJD
Android, Kotlin, Java, Git, Python, Ruby, Ruby on Rails, JavaScript, MacOS, Ubuntu #SOreadytohelp http://stackoverflow.com/10m
Updated on June 01, 2020Comments
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JJD about 4 years
I would like to restrict requests to all API controllers to being redirected to the JSON path. I would like to use a redirect since also the URL should change according to the response.
One option would be to use abefore_filter
which redirects the request to the same action but forces the JSON format. The example is not working yet!# base_controller.rb class Api::V1::BaseController < InheritedResources::Base before_filter :force_response_format respond_to :json def force_response_format redirect_to, params[:format] = :json end end
Another option would be to restrict the format in the routes settings.
# routes.rb MyApp::Application.routes.draw do namespace :api, defaults: { format: 'json' } do namespace :v1 do resources :posts end end end
I want all request to end up as a JSON request:
http://localhost:3000/api/v1/posts http://localhost:3000/api/v1/posts.html http://localhost:3000/api/v1/posts.xml http://localhost:3000/api/v1/posts.json ...
Which strategy would you recommend?
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JJD over 11 yearsSetting the
request.format
to:json
solves the problem that all responses return JSON. It does however not change the URL in the addressbar. -
Leo Correa over 11 yearsIf you're doing an API why would you need to write the URL in the address bar? Note that doing a redirect would return a 300 status and its probably not the most efficient, don't quote me on that though.
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JJD over 11 yearsThis being said, would you then recommend to rewrite the request format to JSON in any case? Another option would be to return some HTTP status as mathieugagne and you mentioned.
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Leo Correa over 11 yearsThese are design options that you have to consider for your API. Do you want to just accept/return JSON or are you open for returning XML and other formats...
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Eric Platon almost 10 years+1 for the beginning of the comment. Adding a format is not that easy in my experience, although Rails make it easy to implement. The API designer still has to think through what it means to support an additional format, with all the implications.
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asymmetric about 9 yearsI would argue that a 406 is a more accurate response in this case. Any Idea why this approach returns a 404?
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dgmstuart about 6 years@asymmetric It's because the constraint says "this rule only matches json requests", so any non-json requests won't match and will fall through to the end unless you have a specific later rule which matches non-json requests and responds explicitly with another response.