Unable to run mutation on join table created by amplify after v6 upgrade

[duranmla]

Before opening, please confirm:

• I have searched for duplicate or closed issues and discussions.
• I have read the guide for submitting bug reports.
• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

JavaScript Framework

React

Amplify APIs

DataStore

Amplify Version

v6

Amplify Categories

No response

Backend

Amplify CLI

Environment information

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    Memory: 1.45 GB / 32.00 GB
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Describe the bug

TL;DR: The @manyToMany relationship isn't utilizing the "userPool" auth mode in DataStore, causing failed requests to mutate the join table as "Unauthorized". Manually adding the join table resolves this issue but introduces additional negative side effects.

Error: "Ensure app code is up to date, auth directives exist and are correct on each model, and that server-side data has not been invalidated by a schema change. If the problem persists, search for or create an issue: https://github.com/aws-amplify/amplify-js/issues"

As you see it is obvious it will fail as it is attempting to mutate using apiKey instead changing to use userPool. It does change the auth mode for creating the Project but go back to the apiKey for the join table

I have a schema where the Project model is related to the Participant model via a @manyToMany relationship. In my application, when a user creates a project, the code first creates or finds an organizer and a participant, and then attempts to create a record in the join table.

I initially tried creating the join table manually and applying authorization policies on my own, which worked. However, I encountered issues with AppSync where I could retrieve tags using the join table, but I couldn't query tags directly from the Project model, which is essential for certain functionalities within the app.

Expected behavior

I would have expected that the relationship will work as it used to do for version 5. I haven't spot updates that I needed to do on the schema to make this work according to https://docs.amplify.aws/javascript/build-a-backend/graphqlapi/data-modeling/#many-to-many-relationship and https://docs.amplify.aws/javascript/build-a-backend/more-features/datastore/relational-models/#many-to-many-relationships it seems it should work. Maybe I'm missing something?

Reproduction steps

1. Add a model with @manyToMany relationships that need special auth directives (like private for edit and public only reads)
2. Try to mutate the join table via DataStore
3. It seems to fail

Code Snippet

type Project
  @model
  @auth(
    rules: [
      { allow: private }
      { allow: public, operations: [read], provider: apiKey }
      # This allow lambda to make CRUD operations
      { allow: private, provider: iam }
    ]
  ) {
  id: ID!
  # ...more attributes I'm removing for convenience
  tags: [Tag] @manyToMany(relationName: "ProjectTagConnection")
  organisers: [Organiser] @manyToMany(relationName: "ProjectOrganiserConnection")
  participants: [Participant]
    @manyToMany(relationName: "ProjectParticipantConnection")
  posts: [Post] @hasMany(indexName: "byProject", fields: ["id"])
}

As you see the Project has several "manyToMany" relationships with other models such Participants (see model below). Since I have upgraded to version 6 the relationship doesn't work properly anymore as I'm not able to mutate on the connection model due to auth errors.

type Participant
  @model
  @auth(
    rules: [
      { allow: private, operations: [read, create, update] }
      { allow: public, operations: [read], provider: apiKey }
    ]
  ) {
  id: ID!
   # ...more attributes I'm removing for convenience
  projects: [Project] @manyToMany(relationName: "ProjectParticipantConnection")
  posts: [Post] @hasMany(indexName: "byParticipant", fields: ["id"])
}

async submitProject(
    data: Pick<
      Project,
      | 'description'
      | 'image'
      | 'launchPlan'
      | 'location'
      | 'mediaHTML'
      | 'name'
      | 'problem'
      | 'solution'
    >
  ): Promise<Project> {
    const cognitoUser = await getCurrentUser()
    const userId = cognitoUser.userId

    const [organiser, participant, project] = await Promise.all([
      this.findOrCreateOrganiser(userId),
      this.findOrCreateParticipant(userId),
      await DataStore.save(
        new Project({
          name: data.name,
          description: data.description,
          location: data.location,
          problem: data.problem,
          solution: data.solution,
          launchPlan: data.launchPlan,
          status: ProjectStatus.DRAFT,
          mediaHTML: data.mediaHTML,
          image: data.image,
        })
      ),
    ])

    // This are the ones that fail
    await Promise.all([
      DataStore.save(
        new ProjectOrganiserConnection({
          project,
          organiser,
        })
      ),
      DataStore.save(
        new ProjectParticipantConnection({
          project,
          participant,
        })
      ),
    ])

    let listener: any
    return await new Promise((resolve, reject) => {
      /**
       * Wait for datastore to sync with the server
       */
      listener = Hub.listen('datastore', (hubData) => {
        const { event, data } = hubData.payload
        if (event === 'outboxStatus') {
          if ((data as { isEmpty: boolean })?.isEmpty) {
            resolve(project)
            listener()
          }
        }
      })

      /**
       * If the sync takes too long, reject the promise
       */
      setTimeout(async () => {
        // this actually doesn't work as I want, since the conflict resolution says "NO". But this is not the real problem I want to solve.
        if (project) DataStore.delete(project)
        reject('Timeout')
      }, 10000)
    })
  }

Log output

// Put your logs below this line

aws-exports.js

No response

Manual configuration

No response

Additional configuration

No response

Mobile Device

No response

Mobile Operating System

No response

Mobile Browser

No response

Mobile Browser Version

No response

Additional information and screenshots

If for some reason the only solution is to create manually the join tables, I don't have issue with it but I wonder if the expected result is for it to work like this:

Fig. 1 This is how it looks with @manyToMany. Ideal

Fig. 2. This is how it looks when querying with the manual join tables in place

Fig. 3. Prove that the record on the join table exists