yii2-flag-behavior
Yii 2.x behavior for managing multiple (virtual) boolean attributes stored as a single integer attribute in a model., (*1)
Installation
The preferred way to install this extension is through composer., (*2)
Either run, (*3)
$ php composer.phar require circulon/yii2-flag-behavior "*"
or add, (*4)
"circulon/yii2-flag-behavior": "*"
to the require section of your composer.json file., (*5)
Note:
In MySQL (I have not used other DB) we can use TINYINT, SMALLINT, MEDIUMINT, INT & BIGINT which offer 8, 16, 24, 32 & 64 flags respectively.
Generally TINYINT(8) or SMALLINT(16) are a good starting point, this also reduces the overhead in your DB., (*6)
Usage
IMPORTANT: attribute names MUST be unique to the model as per standard attribute naming, (*7)
IMPORTANT: The ORDER of attributes (ie the bit position) CANNOT be changed after a record has been inserted.
Please check your order before you insert for the first time., (*8)
Additional flags can be added without issue, (*9)
Add behavior to the model
use circulon\flag\FlagBehavior;
// Recommended to use constants for
// virtual attribute names
const SETTINGS_ACTIVE = 'active';
const SETTINGS_ADMIN = 'admin';
const SETTINGS_POST_COMMENTS = 'postComments';
const SETTINGS_VIEW_REPORTS = 'voewReports';
const SETTINGS_CREATE_REPORTS = 'createReports';
public function behaviors()
{
return [
'FlagBehavior'=> [
'class'=> FlagBehavior::className(),
'fieldattribute' => 'flags', // the db field attribute. Default : 'flags'
// attributes: $flag => $position
// $flag : the attribute name
// $position : the bit position (starting at 0)
'attributes' => [
$this::SETTINGS_ACTIVE => 0, // The bit position order once set
$this::SETTINGS_ADMIN => 1, // MUST NOT BE CHANGED
$this::SETTINGS_POST_COMMENTS => 2, // after any records have been inserted
],
// options: $flag => $options
// $flag : the source attribute
// $options : an array of $operator => $fields
// $operator : (set|clear|not)
// set: sets the attribute to a given value (true|false|'source')
// 'source' will set the attribute to the same as the source ttributes value
// if only the attribute name is provided the attribute is set to true
//
// clear: clears the attributes listed
// not: sets the value of the attributes to the inverse/complement of the source attribute
'options' = [
$this::SETTINGS_ADMIN => [
'set' => [
$this::SETTINGS_POST_COMMENTS, // set to true
$this::SETTINGS_ACTIVE, // set to true
]
],
$this::SETTINGS_ACTIVE => [
'set' => [ $this::SETTINGS_POST_COMMENTS => 'source' ], // set same as SETTINGS_ACTIVE
],
$this::SETTINGS_CREATE_REPORTS => [
'set' => [ $this::SETTINGS_VIEW_REPORTS],
],
],
],
];
}
Access
NOTE: it is recommended to use constants for attribute names.
Should you decide to change the attribute name (not the position) this will then
be used in all models accessing the flags., (*10)
// get/set db attribute directly
$value = $model->fieldAttribute; // initialy set to 0
$model->fieldAttribute = 6; // set flags to admin and post comments (110)
// change flags
// NOTE:
//
$model->{<class name>::SETTINGS_ACTIVE} = true; // set flag (now 111)
$model->active = true;
$model->setFlag({<class name>::SETTINGS_ADMIN}, false); // clear flag (now 101)
$model->setFlag('postComments', false); // clear flag (now 001)
$model->{<class name>::SETTINGS_ACTIVE} = false; // clear flag (now 000)
// check if a flag/setting is set
if ($model->{<class name>::SETTINGS_POST_COMMENTS}) {
// do something here
}
if (!$model->active) {
// show error message
}
if ($model->hasFlag({<class name>::SETTINGS_ADMIN})) {
// allow admin user to ....
}
Searching
You can simply add criteria for your model/s flags, (*11)
NOTE: This may seem a little backwards (ie creating an empty model).
but when creating multi model queries this is the simplest method.
If you have a better or simpler method, let me know or send a pull request., (*12)
Example 1 -- Single model search, (*13)
//
$model = new MyModelWithFlags()
$query = MyModelWithFlags::find();
// add additional criteria as required
$query = $model->addFlagsCriteria($query, [
MyModelWithFlags::SETTING_ACTIVE, // Flags with no value are assumed true
MyModelWithFlags::SETTING_VIEW_REPORTS => false // optionally set the specific (bool or int 1/0) search value
]);
// get records
$query->all();
// DataProvider
$dataProvider = new ActiveDataProvider(['query' => $query]);
Example 2 -- Complex (multi-model) search, (*14)
$searchQuery = PrimarySearchModel::find();
// add criteria....
$model = new MyModelWithFlags()
$searchQuery = $model->addFlagsCriteria($searchQuery, [
MyModelWithFlags::SETTING_ACTIVE, // Flags with no value are assumed true
MyModelWithFlags::SETTING_VIEW_REPORTS => false // optionally set the specific (bool or int 1/0) search value
], true); // generate tablename prefixes
$otherModel = new MyOtherModelWithFlags()
// add additional criteria as required
$searchQuery = $otherModel->addFlagsCriteria($searchQuery, [
MyOtherModelWithFlags::SETTING_OTHER => true,
MyOtherModelWithFlags::SETTING_SOME_SETTING => false,
MyOtherModelWithFlags::SETTING_WORKING,
], true); // generate tablename prefixes
// get records
$searchQuery->all();
// DataProvider
$dataProvider = new ActiveDataProvider(['query' => $searchQuery]);
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