Method checkCollectionId

core/field_relation.go:251–300

(app App, collection *Collection)

}

func (f *RelationField) checkCollectionId(app App, collection *Collection) validation.RuleFunc {
	return func(value any) error {
		v, _ := value.(string)
		if v == "" {
			return nil // nothing to check
		}

		var oldCollection *Collection

		if !collection.IsNew() {
			var err error
			oldCollection, err = app.FindCachedCollectionByNameOrId(collection.Id)
			if err != nil {
				return err
			}
		}

		// prevent collectionId change
		if oldCollection != nil {
			oldField, _ := oldCollection.Fields.GetById(f.Id).(*RelationField)
			if oldField != nil && oldField.CollectionId != v {
				return validation.NewError(
					"validation_field_relation_change",
					"The relation collection cannot be changed.",
				)
			}
		}

		relCollection, _ := app.FindCachedCollectionByNameOrId(v)

		// validate collectionId
		if relCollection == nil || relCollection.Id != v {
			return validation.NewError(
				"validation_field_relation_missing_collection",
				"The relation collection doesn't exist.",
			)
		}

		// allow only views to have relations to other views
		// (see https://github.com/pocketbase/pocketbase/issues/3000)
		if !collection.IsView() && relCollection.IsView() {
			return validation.NewError(
				"validation_relation_field_non_view_base_collection",
				"Only view collections are allowed to have relations to other views.",
			)
		}

		return nil
	}
}

// ---