{"record":{"id":"962ccb2bd9b442eb","repo":"octobercms/october","slug":"invalid-inverse-field-this-inverse-for-sourc","errorCode":null,"errorMessage":"Invalid inverse field '{$this->inverse}' for source '{$this->source}' for '{$this->fieldName}'.","messagePattern":"Invalid inverse field '(.+?)' for source '(.+?)' for '(.+?)'\\.","errorType":"exception","errorClass":"SystemException","httpStatus":null,"severity":"error","filePath":"modules/tailor/contentfields/EntriesField.php","lineNumber":243,"sourceCode":"                'table' => $model->getBlueprintDefinition()->getJoinTableName(),\n                'name' => $this->fieldName,\n                'relationClass' => CustomMultiJoinRelation::class,\n                'relatedKey' => ($relatedMultisite && !$isDualMultisite) ? 'site_root_id' : 'id',\n                'relatedMultisite' => $relatedMultisite\n            ];\n        }\n    }\n\n    /**\n     * defineInverseModelRelationship for the inverse relationship. These definitions\n     * do not rely on multisite via propagatable attribute. Inverse relations do not\n     * replicate and should be treated as read-only.\n     */\n    protected function defineInverseModelRelationship($model)\n    {\n        $otherField = $this->getSourceFieldset()->getField($this->inverse);\n        if (!$otherField || !$otherField instanceof EntriesField) {\n            throw new SystemException(\"Invalid inverse field '{$this->inverse}' for source '{$this->source}' for '{$this->fieldName}'.\");\n        }\n\n        $parentMultisite = $model->getBlueprintDefinition()->useMultisite();\n        $relatedMultisite = $this->getSourceBlueprint()->useMultisite();\n        $relatedModel = $this->getSourceBlueprint()->newModelInstance();\n\n        // Dual-multisite: both parent and related use multisite\n        $isDualMultisite = $parentMultisite && $relatedMultisite;\n\n        $isSingular = $this->maxItems === 1;\n        $otherIsSingular = $otherField->maxItems === 1;\n        $otherIsPropagatable = $relatedMultisite && ($otherField->translatable === false || $otherField->propagatable === true);\n\n        // In dual-multisite, use 'id' for proper site isolation; otherwise use site_root_id for sharing\n        $useRelatedRootKey = $otherIsPropagatable && !$isDualMultisite;\n        $useParentRootKey = $parentMultisite && !$isDualMultisite;\n\n        if ($isSingular) {","sourceCodeStart":225,"sourceCodeEnd":261,"githubUrl":"https://github.com/octobercms/october/blob/b608633a7e8922487d91a8161499020121c3b3bf/modules/tailor/contentfields/EntriesField.php#L225-L261","documentation":"For an entries field with an `inverse:` key, Tailor looks up that handle in the source blueprint's fieldset and requires it to be another EntriesField (getSourceFieldset()->getField()). A missing field, a wrong field type (e.g. recordfinder), or a handle that resolves to nothing means the bidirectional relation cannot be wired, so a SystemException is thrown while the model is being extended.","triggerScenarios":"`inverse: myEntriesField` is set on an entries field, but the source blueprint defines no field with that handle, defines it as a different content field type, or defines it only at a nested level that the fieldset lookup doesn't reach.","commonSituations":"Typos in inverse handles; renaming the inverse field on the source blueprint without updating the other side; intending to pair entries with a recordfinder inverse; source blueprint field errors preventing proper fieldset compilation.","solutions":["On the source blueprint, define an entries field whose handle exactly matches the `inverse:` value.","If the inverse side should be a recordfinder, remove `inverse:` from the entries field — inverse pairing requires entries-to-entries here.","Re-run `php artisan tailor:refresh` after the fix so relation definitions rebuild."],"exampleFix":"# before (blog/posts.yaml)\nfields:\n  author_entries:\n    type: entries\n    source: authors\n    inverse: posts_entries   # not an entries field on authors\n\n# after (authors/author.yaml must contain)\nfields:\n  posts_entries:\n    type: entries\n    source: blog/posts\n    inverse: author_entries","handlingStrategy":"validation","validationCode":"$fieldset = \\Tailor\\Classes\\BlueprintIndexer::instance()->findFieldset($sourceUuid);\n$inverseField = $fieldset ? $fieldset->getField($inverse) : null;\nif (!$inverseField instanceof \\Tailor\\ContentFields\\EntriesField) {\n    throw new InvalidArgumentException(\"Inverse '{$inverse}' missing or not an entries field\");\n}","typeGuard":"function isEntriesInverse(\\Tailor\\Classes\\Fieldset $fieldset, string $inverse): bool\n{\n    return $fieldset->getField($inverse) instanceof \\Tailor\\ContentFields\\EntriesField;\n}","tryCatchPattern":"try {\n    $field->applyModelExtensions / tailor:refresh\n} catch (\\SystemException $e) {\n    // message names the inverse handle; fix the source blueprint's field and refresh\n}","preventionTips":["Treat inverse pairs as a unit: create/modify both entries fields in the same change.","Use symmetric inverse names on both blueprints and review them together in code review.","Remember inverse must point at an entries field, not a recordfinder."],"tags":["tailor","entries-field","inverse-relation","blueprint"],"backgroundTag":"unresolved-reference","analyzedSha":"b608633a7e8922487d91a8161499020121c3b3bf","analyzedAt":"2026-08-21T04:24:57.515Z","schemaVersion":2},"datasetVersion":"2026-08-21T11:28:35.574Z"}