populateCreatorFields not working in Strapi v4

[vandrieu]

Bug report

Describe the bug

Creator fields are not returned by Strapi V4 REST API even when populateCreatorFields is set to true.

Steps to reproduce the behavior

1. Install Strapi v4
2. Start the server using npm run develop
3. Using Strapi admin panel, create a collection type with a name field
4. Add an entry manually using the admin panel GUI
5. Allow the collection to be queried through the public API (settings > roles and permissions > Public > add find and findOne on your collection and save)
6. Query the data using the REST API
7. Creator fields are not shown which is normal as per the V4 docs since populateCreatorFields is false by default: https://docs.strapi.io/developer-docs/latest/development/backend-customization/models.html#model-options
8. Change the options in src/api/<collection>/content-types/<collection>/schema.json to the following:

{
  "kind": "collectionType",
  //...some configs
  "options": {
    "privateAttributes": ["name"],
    "populateCreatorFields": true
  },

9. Make sure the server restarts or restart it
10. Query the API again

Expected behavior

name field is not returned anymore
created_by field is returned

Actual behavior

name field is not returned anymore
created_by field is not returned

System

• Node.js version: v14.18.2
• NPM version: 6.14.13
• Strapi version: 4.0.4
• Database: sqlite
• Operating system: MacOS

[redakzter01]

some workaround?

[niwasmala]

Here is some workaround. It doesn't need to set "populateCreatorFields" options. You can use strapi db query and ask to populate createdBy field.

If you use Graphql API, you need to extend the query you want

// path: ./src/index.js

module.exports = {
  register({ strapi }) {
    const extensionService = strapi.plugin('graphql').service('extension');

    const extension = ({ nexus }) => ({
      types: [
        // creating new object type called Creator
        nexus.objectType({
          type: 'Creator',
          name: 'Creator',
          definition(t) {
            t.int('id');
            t.string('firstname');
            t.string('lastname');
          },
        }),
        nexus.extendType({
          type: 'Article',
          definition(t) {
            // we want to know who is the creator
            t.field('createdBy', {
              type: 'Creator',
              async resolve(root, args, ctx) {
                // when we use query, we can populate createdBy
                const query = strapi.db.query('api::article.article');
                const article = await query.findOne({
                  where: {
                    id: root.id,
                  },
                  populate: ['createdBy'],
                });
                
                return {
                  id: page.createdBy.id,
                  firstname: page.createdBy.firstname,
                  lastname: page.createdBy.lastname,
                };
              },
            })
          }
        }),
      ],
    });

    extensionService.use(extension);
  }
}    

When I query articles, I can ask for the createdBy

query {
  articles {
    data {
      attributes {
        createdBy {
          id
          firstname
          lastname
        }
      }
    }
  }
}

If you use REST API, you can extend the controller

'use strict';

/**
 *  article controller
 */

const { createCoreController } = require('@strapi/strapi').factories;

module.exports = createCoreController('api::article.article', ({ strapi }) => ({
  async find(ctx) {
    // Calling the default core action
    const { data, meta } = await super.find(ctx);

    const query = strapi.db.query('api::article.article');

    await Promise.all(
      data.map(async (item, index) => {
        const article = await query.findOne({
          where: {
            id: item.id,
          },
          populate: ['createdBy'],
        });
        
        data[index].attributes.createdBy = {
          id: page.createdBy.id,
          firstname: page.createdBy.firstname,
          lastname: page.createdBy.lastname,
        };
      })
    );

    return { data, meta };
  },
}));

[strapi-bot]

This issue has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/cant-get-createdby-from-api/15687/2

[derrickmehaffy]

This is correct, we don't populate anything by default so you need to specify the population in v4

[vandrieu]

@derrickmehaffy the last version of the docs reads:

populateCreatorFields
Boolean
Toggles including the created_by and updated_by fields in the API response.

English is not my main language so maybe I just don't understand the sentence correctly. To me, it means if populateCreatorFields is true, then the created_by and updated_by fields will be included in the API response.

Did I misunderstood? If I misunderstood, then would you please clarify what is the real meaning of populateCreatorFields?

Also, if populateCreatorFields does not allow to include created_by and updated_by in the API response then what is the 'official' way of doing it (besides using fancy workarounds like the ones above)?

[derrickmehaffy]

@derrickmehaffy the last version of the docs reads:

populateCreatorFields
Boolean
Toggles including the created_by and updated_by fields in the API response.

English is not my main language so maybe I just don't understand the sentence correctly. To me, it means if populateCreatorFields is true, then the created_by and updated_by fields will be included in the API response.

Did I misunderstood? If I misunderstood, then would you please clarify what is the real meaning of populateCreatorFields?

Also, if populateCreatorFields does not allow to include created_by and updated_by in the API response then what is the 'official' way of doing it (besides using fancy workarounds like the ones above)?

This is a legacy setting from Strapi v3 which automatically populated those fields, in v4 this is no longer an option so this setting I believe now only allows you to populate them at query time.

We have no method to auto populate anything in Strapi v4, so this documentation probably could be updated to reflect that.