ruby-on-rails - graphql- ruby 。使用(而不是中继)突变 DRY。有或没有 GraphQL::Function？

Question

我没有使用中继。

我已经阅读了一些教程。许多人使用这种方式进行突变:

app/graphql/graphql_tutorial_schema.rb

GraphqlTutorialSchema = GraphQL::Schema.define do
  query(Types::QueryType)
  mutation(Types::MutationType)
end

app/graphql/resolvers/create_link.rb

class Resolvers::CreateLink < GraphQL::Function
  argument :description, !types.String
  argument :url, !types.String

  type Types::LinkType

  def call(_obj, args, _ctx)
    Link.create!(
      description: args[:description],
      url: args[:url],
    )
  end
end

最后他们有:

app/graphql/types/mutation_type.rb

Types::MutationType = GraphQL::ObjectType.define do
  name 'Mutation'

  field :createLink, function: Resolvers::CreateLink.new
end

所以他们正在使用 GraphQL::Function。

这是要走的路吗？如果我不使用中继，这是唯一的路吗？

如果我想要一个用于所有link 操作(CRUD)的唯一文件怎么办？

其他教程(http://tech.eshaiju.in/blog/2017/05/15/graphql-mutation-query-implementation-ruby-on-rails/)使用这个:

app/graphql/mutations/comment_mutations.rb

module CommentMutations
  Create = GraphQL::Relay::Mutation.define do
    name "AddComment"

    # Define input parameters
    input_field :articleId, !types.ID
    input_field :userId, !types.ID
    input_field :comment, !types.String

    # Define return parameters
    return_field :article, ArticleType
    return_field :errors, types.String

    resolve ->(object, inputs, ctx) {
      article = Article.find_by_id(inputs[:articleId])
      return { errors: 'Article not found' } if article.nil?

      comments = article.comments
      new_comment = comments.build(user_id: inputs[:userId], comment: inputs[:comment])
      if new_comment.save
        { article: article }
      else
        { errors: new_comment.errors.to_a }
      end
    }
  end
end

和app/graphql/mutations/mutation_type.rb

MutationType = GraphQL::ObjectType.define do
  name "Mutation"
  # Add the mutation's derived field to the mutation type
  field :addComment, field: CommentMutations::Create.field
end

所以我还可以添加:

MutationType = GraphQL::ObjectType.define do
  name "Mutation"
  field :addComment, field: CommentMutations::Create.field
  field :updateComment, field: CommentMutations::Update.field
  field :deleteComment, field: CommentMutations::Delete.field
end

但这仅适用于 Create = GraphQL::Relay::Mutation.define:我没有使用 Relay!

在您的文档中，我没有发现任何与此问题相关的内容。

我必须始终使用 GraphQL::Functions 吗？

或者我可以这样使用它:

MutationType = GraphQL::ObjectType.define do
  name "Mutation"
  field :addComment, field: CommentMutations::Create
  field :updateComment, field: CommentMutations::Update
  field :deleteComment, field: CommentMutations::Delete
end

并有这个(代码是一个例子):

module Mutations::commentMutations
  Createcomment = GraphQL::ObjectType.define do
    name "Createcomment"

    input_field :author_id, !types.ID
    input_field :post_id, !types.ID

    return_field :comment, Types::commentType
    return_field :errors, types.String

    resolve ->(obj, inputs, ctx) {
      comment = comment.new(
        author_id: inputs[:author_id],
        post_id: inputs[:post_id]
      )

      if comment.save
        { comment: comment }
      else
        { errors: comment.errors.to_a }
      end
    }
  end

Updatecomment = GraphQL::ObjectType.define do
    name "Updatecomment"

    input_field :author_id, !types.ID
    input_field :post_id, !types.ID

    return_field :comment, Types::commentType
    return_field :errors, types.String

    resolve ->(obj, inputs, ctx) {
      comment = comment.new(
        author_id: inputs[:author_id],
        post_id: inputs[:post_id]
      )

      if comment.update
        { comment: comment }
      else
        { errors: comment.errors.to_a }
      end
    }
  end
end

这是另一种方式吗？

Answer 1

你应该试试 https://github.com/samesystem/graphql_rails gem 。它在 graphql 端具有 MVC 结构，因此您的 GraphQL 将与您的 RoR 代码几乎相同。

And what if I want a unique file for all link operations (CRUD)?

GraphqlRails 有 Controller 而不是解析器。你可以有这样的东西:

class CommentsController < GraphqlRails::Controller
  action(:create).permit(:article_id, :body).returns(!Types::CommentType)
  action(:update).permit(:id, :body).returns(!Types::CommentType)

  def create
    Comment.create!(params)
  end

  def update
    Comment.find(params[:id]).update!(params)
  end
end