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As Designed Associative arrays as a default values in Serialized DataWriter fields.

Discussion in 'Resolved Bug Reports' started by Minterwute, Feb 18, 2015.

  1. Minterwute

    Minterwute New Member

    I've run into an issue developing an addon for XF 1.4.3.

    Setting a non-empty associative array as the default value for a field of type TYPE_SERIALIZED (or TYPE_JSON) in a DataWriter will result in an error caused by an attempted read on index 0.

    Steps to reproduce the issue:
    1. Add a field to a new or existing DataWriter, with TYPE_SERIALIZED.
    2. Assign the default value of the field to a non-empty associative array.
    // Given fields is the array return by _getFields()
    $fields['my_field'] = array(
        'type'    => self::TYPE_SERIALIZED,
        'default' => array(
            'foo' => 'bar'
    Attempting a write operation that involves this field will produce the following error:
    Undefined offset: 0 - library\XenForo\DataWriter.php:1681
  2. Chris D

    Chris D XenForo Developer Staff Member

    This is actually as designed.

    See XenForo_DataWriter_User for a typical usage.

    Where the default value is an array, it is actually designed to pull the default value from another table managed by the DataWriter, e.g. the default user_id field value for the xf_user_profile table will come from the value set for user_id in the xf_user table.

    If you actually wanted to specify an actual default value there, you would want to serialize the default array:

    // Given fields is the array return by _getFields()

    $fields['my_field'] = array(
    'type'    => self::TYPE_SERIALIZED,
    'default' => serialize(array(
    'foo' => 'bar'

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