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graphql-rails-generators

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Graphql Rails Scaffold™. Automatically generate GraphQL types from your rails models.

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# graphql-rails-generators

A few generators to make it easy to integrate your Rails models with [graphql-ruby](https://github.com/rmosolgo/graphql-ruby). I created this because I was wasting too many keystrokes copying my model schema by hand to create graphql types.

This project contains generators that look at your ActiveRecord model schema and generates graphql types for you.

- `gql:model_type Post` - Generate a graphql type for a model
- `gql:input Post` - Generate a graphql input type for a model
- `gql:mutation Update Post` - Generate a graphql mutation class for a model
- `gql:search_object` - A search object based on [SearchObjectGraphQL](https://github.com/RStankov/SearchObjectGraphQL)

## Installation

```
gem 'graphql-rails-generators', group: :development
```

## Requirements

This library only supports ActiveRecord, though it would be fairly trivial to add support for other ORMs.

## Usage

### gql:model_type

Generate a model type from a model.

```
$ rails generate gql:model_type MODEL_CLASS
```

#### Options

- `--name` - customize the file/class name, useful if you don't want the default Type suffix.

#### Example

```ruby
# app/graphql/post_type.rb
module Types
  class PostType < Types::BaseObject
    field :id, GraphQL::Types::ID, null: true
    field :title, String, null: true
    field :body, String, null: true
    field :created_at, GraphQL::Types::ISO8601DateTime, null: true
    field :updated_at, GraphQL::Types::ISO8601DateTime, null: true
  end
end
```

### gql:input MODEL_CLASS

Generate an input type from a model.

```
rails generate gql:input Post
```

#### Options

- `--name` - customize the file/class name, useful if you don't want the default Input suffix.

#### Example

```ruby
# app/graphql/types/post_input.rb
module Types
  module Input
    class PostInput < Types::BaseInputObject
      argument :title, String, required: false
      argument :body, String, required: false
    end
  end
end
```

### gql:mutations MODEL_CLASS

Generate create, update and delete mutations for a model.

```
rails generate gql:mutations Post
```

#### Example

### gql:mutation MUTATION_PREFIX MODEL_NAME

Generate a mutation class from a model.

A quick note about the mutation generator...

The mutation generator generates something akin to an "upsert" mutation. It takes two arguments: an optional `id` and an optional `attributes`, which is the input type for the model. If you pass an `id`, it will attempt to find the model by the `id` and update it, otherwise it will initialize a new model and attempt to save it.

```
rails generate gql:mutation Update Post
```

#### Example

```ruby
# app/graphql/mutations/update_post.rb
module Mutations
  class UpdatePost < Mutations::BaseMutation
    field :post, Types::PostType, null: true

argument :attributes, Types::Input::PostInput, required: true
    argument :id, GraphQL::Types::ID, required: false

def resolve(attributes:, id: nil)
      model = find_or_build_model(id)
      model.attributes = attributes.to_h
      if model.save
        {post: model}
      else
        {errors: model.errors.full_messages}
      end
    end

def find_or_build_model(id)
      if id
        Post.find(id)
      else
        Post.new
      end
    end
  end
end
```

### gql:search_object MODEL_NAME

Generate a search object from a model using [SearchObjectGraphQL](https://github.com/RStankov/SearchObjectGraphQL)

If you have not yet created a base search resolver:

`rails g gql:model_search_base`

\*_Adds `gem 'search_object_graphql'` to gemfile_

#### Example

```ruby
# app/graphql/resolvers/base_search_resolver.rb
module Resolvers
  class BaseSearchResolver < GraphQL::Schema::Resolver
    require 'search_object'
    require 'search_object/plugin/graphql'
    include SearchObject.module(:graphql)
  end
end
```

Then generate a search object for your model:

`rails g gql:model_search Post`

#### Example

```ruby
# app/graphql/resolvers/post_search.rb
module Resolvers
  class PostSearch < Resolvers::BaseSearchResolver
    type [Types::PostType], null: false
    description "Lists posts"

scope { Post.all }

option(:id, type: Int)   { |scope, value| scope.where id: value }
    option(:title, type: String)   { |scope, value| scope.where title: value }
    option(:body, type: Int)   { |scope, value| scope.where rating: value }
    option(:created_at, type: GraphQL::Types::ISO8601DateTime)   { |scope, value| scope.where created_at: value }
    option(:updated_at, type: GraphQL::Types::ISO8601DateTime)   { |scope, value| scope.where updated_at: value }

def resolve
      []
    end

end
end
```

This will also insert a search field into the beginning of query_type.rb

```ruby
  #app/graphql/types/query_type.rb
  module Types
  class QueryType < Types::BaseObject
    field :posts, resolver: Resolvers::PostSearch
    ...
```

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