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Middleware which allows you to upload files using graphql-ruby, apollo-upload-client and Ruby on Rails.

Note: this implementation uses v2 of the GraphQL multipart request spec, so you should use apollo-upload-client library >= v7.0.0-alpha.3. If you need support for v1 of the GraphQL multipart request spec, you must use version 1.0.0 of this gem.


Add this line to your application's Gemfile:

gem 'apollo_upload_server', '2.1'

And then execute:

$ bundle

Or install it yourself as:

$ gem install apollo_upload_server

Middleware will be used automatically.

Gem adds custom Upload type to your GraphQL types. Use ApolloUploadServer::Upload type for your file as input field:

  input_field :file, ApolloUploadServer::Upload

That's all folks!


The following configuration options are supported:

Strict Mode

This can be set on ApolloUploadServer::Middleware:

ApolloUploadServer::Middleware.strict_mode = true

Doing so ensures that all mapped array values are present in the input. If this is set to true, then for following request:

  "operations": {
    "query": "mutation { ... }",
    "operationName": "SomeOperation",
    "variables": {
      "input": { "id": "123", "avatars": [null, null] }

A mapping for variables.input.avatars.0 or variables.input.avatars.1, will work, but one for variables.input.avatars.100 will not, and will raise an error.

In strict mode, passing empty destination arrays will always fail.


Bug reports and pull requests are welcome on GitHub at 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.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the ApolloUploadServer project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

About JetRuby

ApolloUploadServer is maintained and founded by JetRuby Agency.

We love open source software! See our projects or contact us to design, develop, and grow your product.