Method ValidateValue

core/field_relation.go:198–237

ValidateValue implements [Field.ValidateValue] interface method.

(ctx context.Context, app App, record *Record)

// ValidateValue implements [Field.ValidateValue] interface method.
func (f *RelationField) ValidateValue(ctx context.Context, app App, record *Record) error {
	ids := list.ToUniqueStringSlice(record.GetRaw(f.Name))
	if len(ids) == 0 {
		if f.Required {
			return validation.ErrRequired
		}
		return nil // nothing to check
	}

	if f.MinSelect > 0 && len(ids) < f.MinSelect {
		return validation.NewError("validation_not_enough_values", "Select at least {{.minSelect}}").
			SetParams(map[string]any{"minSelect": f.MinSelect})
	}

	maxSelect := max(f.MaxSelect, 1)
	if len(ids) > maxSelect {
		return validation.NewError("validation_too_many_values", "Select no more than {{.maxSelect}}").
			SetParams(map[string]any{"maxSelect": maxSelect})
	}

	// check if the related records exist
	// ---
	relCollection, err := app.FindCachedCollectionByNameOrId(f.CollectionId)
	if err != nil {
		return validation.NewError("validation_missing_rel_collection", "Relation connection is missing or cannot be accessed")
	}

	var total int
	_ = app.ConcurrentDB().
		Select("count(*)").
		From(relCollection.Name).
		AndWhere(dbx.In("id", list.ToInterfaceSlice(ids)...)).
		Row(&total)
	if total != len(ids) {
		return validation.NewError("validation_missing_rel_records", "Failed to find all relation records with the provided ids")
	}
	// ---

	return nil
}

// ValidateSettings implements [Field.ValidateSettings] interface method.
func (f *RelationField) ValidateSettings(ctx context.Context, app App, collection *Collection) error {