GraphQL::Schema::Directive::Constraint

Allows using @constraint as a directive to validate input data for graphql-ruby.

This gem is greatly inspired by confuser/graphql-constraint-directive

Add this line to your application's Gemfile:

gem 'graphql-schema-directive-constraint'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install graphql-schema-directive-constraint

Specify GraphQL::Schema::Directive::Constraint with parameter to directive arguments in argument

class LengthInput < GraphQL::Schema::InputObject
  argument :arg, String,
    directives: {
      GraphQL::Schema::Directive::Constraint => {
        minLength: 3,
        maxLength: 5,
        pattern: '[0-9a-zA-Z]*$',
      },
    }
end

This LengthInput example will generates definition as below:

input LengthInput {
  arg: String! @constraint(minLength: 3, maxLength: 5, pattern: "[0-9a-zA-Z]*$")
}

This example generates Validators to validates input. You can disable generate validator with without_validator argument like below:

field :without_validator, String, null: false do
  argument :input, String, directives: {
    GraphQL::Schema::Directive::Constraint => {
      pattern: '^[a-z]+$',
      without_validator: true,
    }
  }
end

This example only generates @constraint directive on schema but it does not validates input variable.

• String
  • minLength
    • constraint
    • validator
  • maxLength
    • constraint
    • validator
  • startsWith
    • constarints
    • validator
  • endsWith
    • constraint
    • validator
  • contains
    • constraint
    • validator
  • notContains
    • constraint
    • validator
  • pattern
    • constraint
    • validator
  • format
    • constraint
    • validator
• Integer
  • min
    • constraint
    • validator
  • max
    • constraint
    • validator
  • exclusiveMin
    • constraint
    • validator
  • exclusiveMax
    • constraint
    • validator
  • multipleOf
    • constraint
    • validator
• Errors
  • ConstraintDirectiveError

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 the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/rrreeeyyy/graphql-schema-directive-constraint. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

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

Everyone interacting in the GraphQL::Schema::Directive::Constraint project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.