initial commit

.gitignore

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+*.gem

LICENSE

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+MIT License
+
+Copyright (c) 2019 Alex Sharp
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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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 three 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
+
+## 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
+```
+
+Result:
+
+```ruby
+# app/graphql/post_type.rb
+module Types
+  class PostType < Types::BaseObject
+    field :id, Int, 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
+```
+
+Result:
+```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: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
+```
+
+Result:
+```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, Int, 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
+```

Rakefile

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+gemspec = eval(File.read("graphql-rails-generators.gemspec"))
+
+task :build => "#{gemspec.full_name}.gem"
+
+file "#{gemspec.full_name}.gem" => gemspec.files + ["graphql-rails-generators.gemspec"] do
+  system "gem build graphql-rails-generators.gemspec"
+  system "git tag v#{GraphqlRailsGenerators::VERSION}"
+end

graphql-rails-generators.gemspec

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+require File.expand_path("../lib/graphql-rails-generators/version", __FILE__)
+Gem::Specification.new do |s|
+  s.name        = 'graphql-rails-generators'
+  s.version     = GraphqlRailsGenerators::VERSION
+  s.platform    = Gem::Platform::RUBY
+  s.date        = '2019-11-26'
+  s.summary     = "Hola!"
+  s.description = "A simple hello world gem"
+  s.authors     = ["Alex Sharp"]
+  s.email       = '[email protected]'
+  s.files       = Dir["{lib}/**/*.rb", "LICENSE", "*.md"]
+  s.require_path = 'lib'
+  s.homepage    = 'https://github.com/ajsharp/graphql-rails-generators'
+  s.license     = 'MIT'
+end

lib/generators/gql/USAGE

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+Description:
+    Generate GraphQL types, mutations, and input types from your rails models.
+
+Example:
+    rails generate gql:model_type model_type

lib/generators/gql/gql_generator_base.rb

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+require 'rails/generators/base'
+# require 'active_support/extend'
+module Gql
+  module GqlGeneratorBase
+    extend ActiveSupport::Concern
+
+    included do
+      protected
+      def type_map
+        {
+          integer: 'Int',
+          string: 'String',
+          boolean: 'Boolean',
+          decimal: 'Float',
+          datetime: 'GraphQL::Types::ISO8601DateTime',
+          date: 'GraphQL::Types::ISO8601Date',
+          hstore: 'GraphQL::Types::JSON'
+        }
+      end
+
+      def map_model_types(model_name)
+        klass = model_name.constantize
+        associations = klass.reflect_on_all_associations(:belongs_to)
+        bt_columns = associations.map(&:foreign_key)
+
+        klass.columns
+          .reject { |col| bt_columns.include?(col.name) }
+          .map { |col| {name: col.name, gql_type: type_map.fetch(col.type)} }
+      end
+    end
+  end
+end

lib/generators/gql/input_generator.rb

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+require_relative 'gql_generator_base'
+module Gql
+  class InputGenerator < Rails::Generators::Base
+    include GqlGeneratorBase
+    source_root File.expand_path('../templates', __FILE__)
+    argument :model_name, type: :string
+
+    def generate_input_type
+      file_name = model_name
+
+      ignore = ['id', 'created_at', 'updated_at']
+      @fields = map_model_types(model_name).reject { |field| ignore.include?(field[:name]) }
+
+      template('input_type.rb', "app/graphql/types/input/#{file_name.underscore}_input.rb")
+    end
+  end
+end

lib/generators/gql/model_type_generator.rb

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+require_relative 'gql_generator_base'
+module Gql
+  class ModelTypeGenerator < Rails::Generators::Base
+    include GqlGeneratorBase
+    source_root File.expand_path('../templates', __FILE__)
+    argument :model_name, type: :string
+
+    def type
+      file_name = "#{model_name.underscore}_type"
+      @fields = map_model_types(model_name)
+      template('model_type.rb', "app/graphql/types/#{file_name}.rb")
+    end
+  end
+end

lib/generators/gql/mutation_generator.rb

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+module Gql
+  class MutationGenerator < Rails::Generators::Base
+    argument :mutation_prefix, type: :string
+    argument :model_name, type: :string
+    source_root File.expand_path('../templates', __FILE__)
+
+    def mutation
+      file_name = "#{mutation_prefix}#{model_name}"
+      template('model_mutation.rb', "app/graphql/mutations/#{file_name.underscore}.rb")
+    end
+  end
+
+end

lib/generators/gql/templates/input_type.rb

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+module Types
+  module Input
+    class <%= @model_name %>Input < Types::BaseInputObject
+  <% @fields.each do |field| -%>
+    argument :<%= field[:name] %>, <%= field[:gql_type] %>, required: false
+  <% end %>
+    end
+  end
+end

lib/generators/gql/templates/model_mutation.rb

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+module Mutations
+  class <%= @mutation_prefix %><%= @model_name %> < Mutations::BaseMutation
+    field :<%= @model_name.underscore %>, Types::<%= @model_name %>Type, null: true
+
+    argument :attributes, Types::Input::<%= @model_name %>Input, required: true
+    argument :id, Int, required: false
+
+    def resolve(attributes:, id: nil)
+      model = find_or_build_model(id)
+      model.attributes = attributes.to_h
+      if model.save
+        {<%= @model_name.underscore %>: model}
+      else
+        {errors: model.errors.full_messages}
+      end
+    end
+
+    def find_or_build_model(id)
+      if id
+        <%= @model_name %>.find(id)
+      else
+        <%= @model_name %>.new
+      end
+    end
+  end
+end

lib/generators/gql/templates/model_type.rb

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+module Types
+  class <%= @model_name %>Type < Types::BaseObject
+  <% @fields.each do |field| -%>
+  field :<%= field[:name] %>, <%= field[:gql_type] %>, null: true
+  <% end %>
+  end
+end

lib/graphql-rails-generators/version.rb

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+module GraphqlRailsGenerators
+  VERSION = '1.0.0'
+end