graphql - use queries in mutations - create a nested object

Question

I have a very simple model with post that embeds several comments

I wondered how I should do a mutation to add a new comment to the post

As I already have queries defined to get back a postwith a given id, I wanted to try to have the following mutation syntax working

mutation {
  post(id: "57334cdcb6d7fb172d4680bb") {
    addComment(data: {
      text: "test comment"
    })
  }
}

but I can't seem to find a way to make it work. Even if I'm in a mutation, output type being a post addComment is seen as a field post should have.

Do you guys have any idea ?

Thanks

In fact, I think this article cn help a lot https://www.prisma.io/blog/experimental-graphql-106b07424435/ — Martin Ratinaud, Jul 19 '18 at 05:12

Corey · Answer 1 · 2018-07-11T18:03:20.120

You can't embed fields into other fields like that.

You would create a new input object for your post mutation

input CommentInput {
 text: String
}

type Mutation {
 post(id: ID!, addComment: CommentInput): Post
}

In your resolver you look for the addComment variable and call the addComment resolver with the arguments.

Your mutation would be

mutation {
  post(id: "57334cdcb6d7fb172d4680bb", 
    addComment: {
      text: "test comment"
    }) {
    id
    comment {
      text
    }
  }
}

score 0 · Answer 2 · answered Jun 14 '17 at 12:51

I could be wrong but you may want to just create a separate updatePost mutation that accepts the post id as an argument

type Post {
   comments: [ Comment ]
}

input PostInput {
   comments: [ CommentInput ]
}

type Mutation {
   updatePost( id: ID!, input: PostInput ): Post
}

The updatePost mutation here takes the id of the post and the updated post object as arguments and returns a type Post. So I would use this like so:

mutation {
  updatePost( id: '1234', input: { comments: []) {
    id
  }
}

Hope this helps!

Actually this is not exactly what I want as what you propose would replace whatever is in comments by what you provide. What I need is a way to use an existing other mutation within a mutation. Thanks anyway ! — Martin Ratinaud, Jun 30 '17 at 09:48

score 0 · Answer 3 · edited Nov 02 '17 at 12:40

0

Maybe you could create addComment mutation that you pass post id to and then return a Post.

type Mutation {
   addComment( postId: ID!, input: CommentInput ): Post
}

edited Nov 02 '17 at 12:40

Vojtech Ruzicka

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answered Nov 02 '17 at 12:16

Andrija Ćeranić

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graphql - use queries in mutations - create a nested object

3 Answers3