file_field_find_file_reference_column(FieldDefinitionInterface $field)
Determine whether a field references files stored in {file_managed}.
Parameters
\Drupal\Core\Field\FieldDefinitionInterface $field: A field definition.
Return value
bool The field column if the field references {file_managed}.fid, typically fid, FALSE if it does not.
File
- core/modules/file/file.field.inc, line 197
- Field module functionality for the File module.
Code
function file_field_find_file_reference_column(FieldDefinitionInterface $field) { $schema = $field->getFieldStorageDefinition()->getSchema(); foreach ($schema['foreign keys'] as $data) { if ($data['table'] == 'file_managed') { foreach ($data['columns'] as $field_column => $column) { if ($column == 'fid') { return $field_column; } } } } return FALSE; }
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