SOLVED: Work with API only app about graphiql-rails HOT 10 CLOSED

If you're experiencing the error:

Expected to find a manifest file in `app/assets/config/manifest.js` (Sprockets::Railtie::ManifestNeededError)

With Rails 6/Sprockets 4, downgrade to Sprockets 3 by adding this to your Gemfile:

gem 'sprockets', '~> 3'

And running bundle update sprockets

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Update: Figured this out myself. The only thing necessary (rails 5.2.0) is to add the following lines to application.rb

require "sprockets/railtie"

config.middleware.use Rack::MethodOverride

Closing. But it might be nice to add it to the readme!

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You don't need to downgrade sprocket, just add a manifest.js file and it'll work:
See: #13 (comment)

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People starting new projects with Rails 6 in API mode will encounter issue @Li357 has pointed out. Thanks for the solution!

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FYI, if you don't want to run on a lower sprockets version you can just do:

1. Create the manifest file:

touch app/assets/config/manifest.js

2. Add links to the GraphiQL CSS and JS files so they get loaded:

//= link graphiql/rails/application.css
//= link graphiql/rails/application.js

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Glad you found a solution, and thanks for sharing it! Feel free to open a PR to the readme if you're interested.

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Thanks @Li357! gem 'sprockets', '~> 3' worked!

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For anyone getting this error, because your Rails app is API-only:
No route matches [GET] "/graphiql"
You need to temporarily update config.api_only to be false (in application.rb). Then you can re-run spring rails generate graphql:install and it will generate what you need.

It also can be done manually, by adding

gem 'graphiql-rails', group: :development

to your Gemfile and

if Rails.env.development?
  mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql"
end

to routes.rb

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Thanks @Li357!

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Update: Figured this out myself. The only thing necessary (rails 5.2.0) is to add the following lines to application.rb

require "sprockets/railtie"

config.middleware.use Rack::MethodOverride

Closing. But it might be nice to add it to the readme!

Can you explain why you picked this?
Reading in the docs I find this for Rack::MethodOverride

Allows the method to be overridden if params[:_method] is set. This is the middleware which supports the PUT and DELETE HTTP method types.

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