2/1/2024 0 Comments Json query inside where railsWe’re still repeating ourselves a bit with the above example. new ( :json ) resources :comments, constraints: Routes :: FormatConstraints. new ( :json ) resources :posts, constraints: Routes :: FormatConstraints. draw do resources :users, only: :index, constraints: Routes :: FormatConstraints. symbol ) end end end # config/routes.rb Rails. # config/initializers/routes/format_constraints.rb module Routes class FormatConstraints attr_reader :formats def initialize ( formats ) # This coerces formats into an array = Array ( formats ) end def matches? ( request ) # This checks to see the request format matches the array # Useful for multi formats like Routes::FormatConstraints.new() formats. With this we have ourselves a highly reusable format constraint.įor the below example I’ve added a couple extra routes for demonstration purposes. This class must respond to the #matches? message. Advanced Constraintsįor cases where we want to apply the same constraint to several routes, we can use a dedicated class. Of course not! Rails doesn’t leave you hanging on this. Am I going to need to repeat this pattern for each of them?”. So, now you’re thinking, “This is great and all, but I have 200 other json only endpoints. return a relation of users in json formatĬlass UsersController request end. ![]() Here’s a typical controller setup where we want to accomplish the following things: ![]() Request-based constraints in the Routing layer. ![]() There’s nothing wrong with this approach BUT we can do better here by using Outside of this expected format are generally handled within the controller With web requests, your controllers expect to respond to specific content formats. I prefer doing things The Rails Way tm whenever possible.
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