graphql-errors
GraphQL::Execution::Errors
in the graphql
gem. See more details rmosolgo/graphql-ruby#2458.
This gem provides a simple error handling for graphql-ruby.
Highlights
- Error handling for each field.
- Logic inside the
rescue_from
block, similarly to Rails. - Catching exceptions by ancestors, e.g.
CustomError
withrescue_from StandardError
. - Per schema configuration.
- No dependencies.
Usage
Once you defined your GraphQL schema:
Schema = GraphQL::Schema.define do
query QueryType
end
You can add rescue_from
error handlers with GraphQL::Errors
. For example:
GraphQL::Errors.configure(Schema) do
rescue_from ActiveRecord::RecordNotFound do |exception|
nil
end
rescue_from ActiveRecord::RecordInvalid do |exception|
GraphQL::ExecutionError.new(exception.record.errors.full_messages.join("\n"))
end
# uses Module to handle several similar errors with single rescue_from
rescue_from MyNetworkErrors do |_|
GraphQL::ExecutionError.new("Don't mind, just retry the mutation")
end
rescue_from StandardError do |exception|
GraphQL::ExecutionError.new("Please try to execute the query for this field later")
end
rescue_from CustomError do |exception, object, arguments, context|
error = GraphQL::ExecutionError.new("Error found!")
firstError.path = context.path + ["myError"]
context.add_error(firstError)
end
end
It'll handle exceptions raised from each resolver in the schema:
QueryType = GraphQL::ObjectType.define do
name "Query"
field :post, PostType do
argument :id, !types.ID
resolve ->(obj, args, ctx) { Post.find(args['id']) } # <= will raise ActiveRecord::RecordNotFound
end
end
Schema.execute('query { post(id: "1") { title } }') # handles the error without failing the whole query
# => { data: { post: nil } }
Installation
Add this line to your application's Gemfile:
gem 'graphql-errors'
And then execute:
$ bundle
Or install it yourself as:
$ gem install graphql-errors
Development
After checking out the repo, run bin/setup
to install dependencies. Then, run rake spec
to run the tests. You can also run bin/console
for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install
. To release a new version, update the version number in version.rb
, and then run bundle exec rake release
, which will create a git tag for the version, push git commits and tags, and push the .gem
file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/exAspArk/graphql-errors. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.
Code of Conduct
Everyone interacting in the Graphql::Errors project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.