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Skip observers feature implementation #179

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Skip observers feature implementation #179

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3d58618
Refactoring before skip_observers() feature implementation. See https…
ivantcholakov Jul 30, 2014
25dd66a
skip_observers() feature implementation. See https://github.com/jamie…
ivantcholakov Jul 30, 2014
1de1eae
A minor correction within README.md. See https://github.com/jamierumb…
ivantcholakov Jul 30, 2014
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9 changes: 9 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,15 @@ Observers can also take parameters in their name, much like CodeIgniter's Form V
return $row;
}

**By using the scope skip_observers() triggering of all the attached/registered observers can be disabled. For example:**

```php
// A user logs in. We want to store a timestamp of this moment,
// but we don't the registered built-in observer 'updated_at' to be triggered,
// i.e. we don't want the field 'updated_at' to change its value.
$this->users->skip_observers()->update($id, array('last_login_at' => date('Y-m-d H:i:s')));
```

Validation
----------

Expand Down
139 changes: 101 additions & 38 deletions core/MY_Model.php
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,11 @@ class MY_Model extends CI_Model

protected $callback_parameters = array();

/**
* Support for skip_observers() scope.
*/
protected $_temporary_skip_observers = FALSE;

/**
* Protected, non-modifiable attributes
*/
Expand Down Expand Up @@ -110,7 +115,7 @@ public function __construct()
array_unshift($this->before_create, 'protect_attributes');
array_unshift($this->before_update, 'protect_attributes');

$this->_temporary_return_type = $this->return_type;
$this->_reset_state();
}

/* --------------------------------------------------------------
Expand All @@ -122,7 +127,7 @@ public function __construct()
*/
public function get($primary_value)
{
return $this->get_by($this->primary_key, $primary_value);
return $this->get_by($this->primary_key, $primary_value);
}

/**
Expand All @@ -138,7 +143,7 @@ public function get_by()
$this->_database->where($this->soft_delete_key, (bool)$this->_temporary_only_deleted);
}

$this->_set_where($where);
$this->_set_where($where);

$this->trigger('before_get');

Expand All @@ -148,7 +153,8 @@ public function get_by()

$row = $this->trigger('after_get', $row);

$this->_with = array();
$this->_reset_state();

return $row;
}

Expand Down Expand Up @@ -196,7 +202,8 @@ public function get_all()
$row = $this->trigger('after_get', $row, ($key == count($result) - 1));
}

$this->_with = array();
$this->_reset_state();

return $result;
}

Expand All @@ -220,23 +227,29 @@ public function insert($data, $skip_validation = FALSE)

$this->trigger('after_create', $insert_id);

$this->_reset_state();

return $insert_id;
}
else
{
return FALSE;
}

$this->_reset_state();

return FALSE;
}

/**
* Insert multiple rows into the table. Returns an array of multiple IDs.
*/
public function insert_many($data, $skip_validation = FALSE)
{
$skip_observers = $this->_temporary_skip_observers;

$ids = array();

foreach ($data as $key => $row)
{
$this->_temporary_skip_observers = $skip_observers;

$ids[] = $this->insert($row, $skip_validation, ($key == count($data) - 1));
}

Expand All @@ -263,12 +276,14 @@ public function update($primary_value, $data, $skip_validation = FALSE)

$this->trigger('after_update', array($data, $result));

$this->_reset_state();

return $result;
}
else
{
return FALSE;
}

$this->_reset_state();

return FALSE;
}

/**
Expand All @@ -291,12 +306,14 @@ public function update_many($primary_values, $data, $skip_validation = FALSE)

$this->trigger('after_update', array($data, $result));

$this->_reset_state();

return $result;
}
else
{
return FALSE;
}

$this->_reset_state();

return FALSE;
}

/**
Expand All @@ -316,12 +333,14 @@ public function update_by()
->update($this->_table);
$this->trigger('after_update', array($data, $result));

$this->_reset_state();

return $result;
}
else
{
return FALSE;
}

$this->_reset_state();

return FALSE;
}

/**
Expand All @@ -334,6 +353,8 @@ public function update_all($data)
->update($this->_table);
$this->trigger('after_update', array($data, $result));

$this->_reset_state();

return $result;
}

Expand All @@ -357,6 +378,8 @@ public function delete($id)

$this->trigger('after_delete', $result);

$this->_reset_state();

return $result;
}

Expand All @@ -367,11 +390,10 @@ public function delete_by()
{
$where = func_get_args();

$where = $this->trigger('before_delete', $where);
$where = $this->trigger('before_delete', $where);

$this->_set_where($where);


if ($this->soft_delete)
{
$result = $this->_database->update($this->_table, array( $this->soft_delete_key => TRUE ));
Expand All @@ -383,6 +405,8 @@ public function delete_by()

$this->trigger('after_delete', $result);

$this->_reset_state();

return $result;
}

Expand All @@ -406,6 +430,8 @@ public function delete_many($primary_values)

$this->trigger('after_delete', $result);

$this->_reset_state();

return $result;
}

Expand All @@ -417,6 +443,8 @@ public function truncate()
{
$result = $this->_database->truncate($this->_table);

$this->_reset_state();

return $result;
}

Expand All @@ -436,11 +464,14 @@ public function with($relationship)
return $this;
}

// This observer is to be suppressed by skip_observers() scope too.
// This might change if there is a good/valid use-case, but let us not
// complicate code for now.
public function relate($row)
{
if (empty($row))
if (empty($row))
{
return $row;
return $row;
}

foreach ($this->belongs_to as $key => $value)
Expand Down Expand Up @@ -543,6 +574,8 @@ function dropdown()

$options = $this->trigger('after_dropdown', $options);

$this->_reset_state();

return $options;
}

Expand All @@ -559,7 +592,11 @@ public function count_by()
$where = func_get_args();
$this->_set_where($where);

return $this->_database->count_all_results($this->_table);
$result = $this->_database->count_all_results($this->_table);

$this->_reset_state();

return $result;
}

/**
Expand All @@ -572,7 +609,11 @@ public function count_all()
$this->_database->where($this->soft_delete_key, (bool)$this->_temporary_only_deleted);
}

return $this->_database->count_all($this->_table);
$result = $this->_database->count_all($this->_table);

$this->_reset_state();

return $result;
}

/**
Expand Down Expand Up @@ -651,6 +692,15 @@ public function only_deleted()
return $this;
}

/**
* Disables triggering of all the attached/registered observers.
*/
public function skip_observers()
{
$this->_temporary_skip_observers = TRUE;
return $this;
}

/* --------------------------------------------------------------
* OBSERVERS
* ------------------------------------------------------------ */
Expand Down Expand Up @@ -780,7 +830,7 @@ public function limit($limit, $offset = 0)
*/
public function trigger($event, $data = FALSE, $last = TRUE)
{
if (isset($this->$event) && is_array($this->$event))
if (!$this->_temporary_skip_observers && isset($this->$event) && is_array($this->$event))
{
foreach ($this->$event as $method)
{
Expand All @@ -804,12 +854,12 @@ public function trigger($event, $data = FALSE, $last = TRUE)
*/
public function validate($data)
{
if($this->skip_validation)
if ($this->skip_validation)
{
return $data;
}

if(!empty($this->validate))
if (!empty($this->validate))
{
foreach($data as $key => $val)
{
Expand All @@ -818,7 +868,7 @@ public function validate($data)

$this->load->library('form_validation');

if(is_array($this->validate))
if (is_array($this->validate))
{
$this->form_validation->set_rules($this->validate);

Expand Down Expand Up @@ -901,8 +951,8 @@ protected function _set_where($params)
{
$this->_database->where($params[0]);
}
else if(count($params) == 2)
{
else if(count($params) == 2)
{
if (is_array($params[1]))
{
$this->_database->where_in($params[0], $params[1]);
Expand All @@ -911,11 +961,11 @@ protected function _set_where($params)
{
$this->_database->where($params[0], $params[1]);
}
}
else if(count($params) == 3)
{
$this->_database->where($params[0], $params[1], $params[2]);
}
}
else if(count($params) == 3)
{
$this->_database->where($params[0], $params[1], $params[2]);
}
else
{
if (is_array($params[1]))
Expand All @@ -937,4 +987,17 @@ protected function _return_type($multi = FALSE)
$method = ($multi) ? 'result' : 'row';
return $this->_temporary_return_type == 'array' ? $method . '_array' : $method;
}

/**
* Resets all internal state flags and temporary scope data.
*/
protected function _reset_state()
{
$this->_with = array();
$this->_temporary_return_type = $this->return_type;
$this->_temporary_with_deleted = FALSE;
$this->_temporary_only_deleted = FALSE;
$this->_temporary_skip_observers = FALSE;
}

}