Cannot populate many to many relation

Questions and Answers Strapi Backend
1
System Information
  • Strapi Version: v4.3.0
  • Operating System: MacOs
  • Database: Sqlite
  • Node Version: 16.14.2
  • NPM Version: 8.5
  • Yarn Version: 1.22.19

I can the category when I set one to many but when I change it to many to many the category isn’t populated.

{
  "kind": "collectionType",
  "collectionName": "categories",
  "info": {
    "singularName": "category",
    "pluralName": "categories",
    "displayName": "Category",
    "name": "category"
  },
  "options": {
    "increments": true,
    "timestamps": true
  },
  "attributes": {
    "name": {
      "type": "string",
      "required": true
    },
    "slug": {
      "type": "uid",
      "targetField": "name",
      "required": true
    },
    "articles": {
      "type": "relation",
      "relation": "manyToMany",
      "target": "api::article.article",
      "inversedBy": "categories"
    }
  }
}

{
  "kind": "collectionType",
  "collectionName": "articles",
  "info": {
    "singularName": "article",
    "pluralName": "articles",
    "displayName": "Article",
    "name": "article",
    "description": ""
  },
  "options": {
    "increments": true,
    "timestamps": true,
    "draftAndPublish": true
  },
  "pluginOptions": {},
  "attributes": {
    "title": {
      "type": "string",
      "required": true
    },
    "description": {
      "type": "text",
      "required": true
    },
    "content": {
      "type": "richtext",
      "required": true
    },
    "slug": {
      "type": "uid",
      "targetField": "title",
      "required": true
    },
    "categories": {
      "type": "relation",
      "relation": "manyToMany",
      "target": "api::category.category",
      "inversedBy": "articles"
    },
    "image": {
      "type": "media",
      "multiple": false,
      "required": false,
      "allowedTypes": [
        "images"
      ]
    },
    "author": {
      "type": "relation",
      "relation": "manyToOne",
      "target": "api::writer.writer",
      "inversedBy": "articles"
    }
  }
}

On the frontend :

 fetchAPI("/articles", { populate: ["image", "category"] }),

I’m learning strapi it comes from this blog article:

2

Hi, have you tried using plural for category as categories? It could be because the relationship has changed it’s looking for many and not just singular now.

3

Thank you setting to categories fixed the issue