Drupal 7 Field Multiple value deletion and display - drupal-7

Question

I have been stuck for days and I hope that somebody could help me out.
I am writing a module to link to different node (I understand that such module does exist however I would like to practice coding a module, I did tried to look at other module for reference, however, I cannot spot any problem).
After I added the module, I activate the field in a custom node type and select allow multiple value. When I added the content (of that content type) two of the field appears instead of one, and when I added extra field, I cannot delete. I hope that someone can give me some direction on how to fix it. I have included a screenshot of the problem below. I am also hoping to add a delete button / a way to delete an extra item. After research for days, I cannot find a drupal way to do it.
Below are the code I added for reference
for belong_to_relation.install, I added the following
function belong_to_relation_field_schema ($field) {
if ($field['type'] == 'belong_to_relation') {
// Declare fields in the db
$columns = array (
'to_node_type' => array (
'type' => 'varchar',
'length' => '64',
'not null' => FALSE,
'description' => 'The relation id from the belong_to_relation table',
),
'to_node_nid' => array (
'type' => 'int',
'not null' => FALSE,
'description' => 'the node id of the to node',
),
'extended_node_nid' => array (
'type' => 'int',
'not null' => FALSE,
'description' => 'the node id of the extended field node',
),
);
return array (
'columns' => $columns,
'indexes' => array(),
);
}
}
For belong_to_relation.module, I added the following
function belong_to_relation_field_info () {
return array (
'belong_to_relation_reference' => array (
'label' => t("Belong to Relation Node Reference"),
'description' => t('This field stores a node reference to a node of another content type'),
'default_widget' => 'belong_to_relation_reference_widget',
'default_formatter' => 'belong_to_relation_reference_formatter',
),
);
}
function belong_to_relation_field_widget_info () {
return array (
'belong_to_relation_reference_widget' => array (
'label' => t('Default'),
'field types' => array ('belong_to_relation_reference'),
),
);
}
function belong_to_relation_field_widget_form (&$form, &$form_state, $field,
$instance, $langcode, $items,
$delta, $element) {
$element += array(
'#type' => 'fieldset',
'#tree' => true
);
$element['to_node_type'] = array (
'#type' => 'select',
'#title' => t('Target Node Type'),
'#options' => array(),
'#default_value' => isset($item['to_node_type']) ? $item['to_node_type'] : NULL,
'#empty_option' => 'Select a Node type',
);
$element['to_node_nid'] = array (
'#type' => 'select',
'#title' => t('Target Node Type'),
'#options' => array(),
'#default_value' => isset($item['to_node_nid']) ? $item['to_node_nid'] : NULL,
'#empty_option' => 'Select a Node',
);
$element['extended_node_nid'] = array (
'#type' => 'select',
'#title' => t('Target Node Type'),
'#options' => array(),
'#default_value' => isset($item['extended_node_nid']) ? $item['extended_node_nid'] : NULL,
'#empty_option' => 'Select a Node type',
);
return $element;
}
function belong_to_relation_field_is_empty ($item, $field) {
return FALSE;
}
function belong_to_relation_field_formatter_info () {
return array (
'belong_to_relation_reference_formatter' => array (
'label' => t('Simple Belong To Relation Formatter'),
'field types' => array ('belong_to_relation_reference'),
),
);
}
I am currently running on drupal 7.7 on MAMP.

Answer 1

The OP wrote:
Solved, need to delete the if ($field['type'] == 'belong_to_relation') line in .install