How to push new item_id to a relation field in graphql mutation

Questions and Answers
1
System Information
  • Strapi Version: 4.14.2
  • Operating System: linux
  • Database: mysql
  • Node Version: 16
  • NPM Version:
  • Yarn Version:

mutation code:

mutation updateFollows (
  $updateUsersPermissionsUserId: ID!,
  $data: UsersPermissionsUserInput!,
  ){
    updateUsersPermissionsUser(id: $updateUsersPermissionsUserId, data: $data
    ){
    data{
      id
      attributes{
        follows {
          data {
            id
          }
        }
      }
    }
  }
}

update_parmas is:

{
  "updateUsersPermissionsUserId": 1,
  "data": {
    "follows": [1,2,3,4]
  }
}

if I want push new id 5 to follows,
i can set “follows”: [1,2,3,4,5],
ofcs it worked well,

but my question is:
how to push 5,not renew follows array,

because the old data of follows maybe have follows.length > 10000000000,I can’t get them all and renew a new array and set it

thanks to all

2

Practically if you have a bidirectionnal relationship and if the other way around is simpler you can update the followed and not the follower. If it’s not the case then… good question.

3

You can write the src/index.ts file like this:

import {Event} from "@strapi/database/dist/lifecycles";

export default {
  /**
   * An asynchronous register function that runs before
   * your application is initialized.
   *
   * This gives you an opportunity to extend code.
   */
  register(/*{ strapi }*/) {},

  /**
   * An asynchronous bootstrap function that runs before
   * your application gets started.
   *
   * This gives you an opportunity to set up your data model,
   * run jobs, or perform some special logic.
   */
  bootstrap(/*{ strapi }*/) {
    strapi.db.lifecycles.subscribe({
      models: ['plugin::users-permissions.user'],

      // your lifecycle hooks
      async beforeUpdate(event: Event) {

        const user = await strapi.query('plugin::users-permissions.user').findOne({
          where: event.params.where,
          populate: {
            follows: {
              select: ['id']
            }
          }
        })

        if (user) {
          event.params.data.follows = [...user.follows, ...event.params.data.follows]
        }
      }
    })
  },
};

So you just need to use that query variables :
{ "updateUsersPermissionsUserId": 1, "data": { "follows": [4] } }

And you have the previous follows plus the id 4 for user 1

You can also modifying update methods for user