Cms: GraphQL: Empty result for asset query in matrix block within referenced entry in entries field

[rocknrolaf]

Description

When an asset/image field is queried within a matrix block of a referenced entry in an entries field the result is empty and an empty array is returned.

Entry -> Entries field -> Entry -> Matrix -> Matrix Block -> Asset

Steps to reproduce

1. Create a section "B" with a matrix field and a block which contains an image
2. In another section "A" reference an entry of the section "B" via the entries field
3. Query section "A" and its nested section "B" and the matrixblock and image within

Example:

query getCaseEntry($site: [String], $slug: [String]) {
  case: entries(section: ["cases"], site: $site, slug: $slug) {
    ... on cases_cases_Entry {
      embeds {
        ... on embeds_gallery_BlockType {
          reference {
            ... on galleries_galleries_Entry {
              gallery {
                ... on gallery_image_BlockType {
                  image {
                    id
                  }
                  caption
                }
              }
            }
          }
        }
      }
    }
  }
}

Result:

{
  "data": {
    "case": [
      {
        "embeds": [
          {},
          {
            "reference": [
              {
                "gallery": [
                  {
                    "image": [],
                    "caption": "Caption 1"
                  },
                  {
                    "image": [],
                    "caption": "Caption 2"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  }
}

Additional info

• Craft version: 3.4.1
• PHP version: 7.3.8
• Database driver & version: MySQL 5.5.5
• Plugins & versions:
  Redactor | 2.5.0
  Typed link field | 1.0.19

Solution

In src/gql/resolvers/elements/Asset.php line 33 if 'getFieldValue' is used the asset object seems to be correctly fetched and returned.

        // If this is the beginning of a resolver chain, start fresh
        if ($source === null) {
            $query = AssetElement::find();
            // If not, get the prepared element query
        } else {
            // WON'T WORK: empty result for matrixblock within referenced entry in entries field
            $query = $source->$fieldName;
            // WORKS:
            //$query = $source->getFieldValue($fieldName);
        }

[andris-sevcenko]

I'm unable to reproduce this locally. Can you try clearing the caches?

[rocknrolaf]

Thanks for looking into it! I cleared the cache already. I also disabled caching via 'enableGraphQlCaching' setting to debug into it via xdebug. I forgot to mention that is a multisite/multilanguage setup. Maybe a screenshot of the structure helps:

[andris-sevcenko]

Is the linked entry from the same site?

[rocknrolaf]

Yes both are enabled for the same site. Also the direct query for the gallery seems to deliver the image data fine. Only via the entries reference there is no image data returned.

[andris-sevcenko]

@rocknrolaf any chance you can send your DB dump, composer.json, and the composer.lock files over to [email protected] and reference this issue in the email?

[rocknrolaf]

@andris-sevcenko i sent it over to you

[andris-sevcenko]

Thanks for that! Ended up being a bug in the logic how Craft creates the eager loading parameter array when analyzing the GraphQL query.

To get the fix early, change your craftcms/cms requirement in composer.json to:

"require": {
  "craftcms/cms": "dev-develop#6b51bf14f7b1f5fecf42f1b8cfc8de7060e35bc7",
  "...": "..."
}

Then run composer update.

[brandonkelly]

Craft 3.4.6 is out now with this change.