Gentics Mesh - Multilanguage support - Cross language in a list of node - GraphQL query

Question

Gentics Mesh Version : v1.5.1

Intro:

Let suppose we have schema A with a field of type: list and list type: node and allowed schemas: B. (see (1)).

• An instance of B node has been created (b1-EN) in language en and (b1-DE) in de.
• An instance of B node has been created (b2-EN) in languages en.
• An instance of A node has been created (a1-DE) in language de and b1-DE and b2-EN are added in the node list (Bs) of a1.

As result, when selecting de language in the Gentics Mesh CMS, Node a1-DE (de) has a list of 2 nodes b1-DE, b2-EN.

When the following GraphQL query is applied :

{
  node(path: "/a1-DE") {
      ... on A {
        path
        uuid
        availableLanguages
        fields {
          Bs {
            ... on B {
              path
              fields {
                id
              }
            }
          }
       }
    }
  }
}

The result is :

{
  "data": {
    "node": {
      "path": "/a1-DE",
      "uuid": "30dfd534cdee40dd8551e6322c6b1518",
      "availableLanguages": [
        "de"
      ],
      "fields": {
        "Bs": [
          {
            "path": "/b1-DE",
            "fields": {
              "id": "b1-DE"
            }
          },
          {
            "path": null,
            "fields": null
          }
        ]
      }
    }
  }
}

Question:

Why the result is not showing the b2-EN node in the list of nodes ? Is the query wrong ? What I would like to get as result is the default language version of the node (b2-EN) because the b2-DE is not contributed yet. so the expected result :

{
  "data": {
    "node": {
      "path": "/a1-DE",
      "uuid": "30dfd534cdee40dd8551e6322c6b1518",
      "availableLanguages": [
        "de"
      ],
      "fields": {
        "Bs": [
          {
            "path": "/b1-DE",
            "fields": {
              "id": "b1-DE"
            }
          },
          {
            "path": "/b2-EN",
            "fields": {
              "id": "b2-EN"
            }
          }
        ]
      }
    }
  }
}

In the documentation (2):

The fallback to the configured default language will be applied if no other matching content found be found. Null will be returned if this also fails.

Can someone enlighten me ?

(1): Schema

{
    "name": "A",
    "container": false,
    "autoPurge": false,
    "displayField": "id",
    "segmentField": "id",
    "urlFields": [
        "id"
    ],
    "fields": [
        {
            "name": "Bs",
            "type": "list",
            "label": "Bs",
            "required": false,
            "listType": "node",
            "allow": [
                "B"
            ]
        },
        {
            "name": "id",
            "type": "string",
            "label": "id",
            "required": true
        }
    ]
}

(2) https://getmesh.io/docs/graphql/#_multilanguage_support

Answer 1

There are some known issues and inconsistent behaviour when loading nodes via GraphQL. See this issue: https://github.com/gentics/mesh/issues/971

In your case, the queried list of nodes will always be in the configured default language (in mesh.yml). In your case this seems to be de. This is why the English-only node yields no result.

Until this is fixed, you can work around this issue by loading all languages of the node list:

{
  node(path: "/a1-DE") {
      ... on A {
        path
        uuid
        availableLanguages
        fields {
          Bs {
            ... on B {
              languages {
                path
                language
                fields {
                  id
                }
              }
            }
          }
       }
    }
  }
}

You will the contents of all languages of the node list. This means that you will have to filter for the desired language in your code after receiving the response.