Yii2 find one

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub?

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. But findOne behaves strangely in the case. And I didn't find the description of this behavior in any documentation. The text was updated successfully, but these errors were encountered:.

Yii2 find one

ActiveRecord is the base class for classes representing relational data in terms of objects. Active Record implements the Active Record design pattern. The object's attributes are mapped to the columns of the corresponding table. Referencing an Active Record attribute is equivalent to accessing the corresponding table column for that record. As an example, say that the Customer ActiveRecord class is associated with the customer table. This would mean that the class's name attribute is automatically mapped to the name column in customer table. In this example, Active Record is providing an object-oriented interface for accessing data stored in the database. But Active Record provides much more functionality than this. The tableName method only has to return the name of the database table associated with the class. Tip: You may also use the Gii code generator to generate ActiveRecord classes from your database tables. For more details and usage information on ActiveRecord, see the guide article on ActiveRecord. This method will check if any attached behavior has the named method and will execute it if available. Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked. Source code.

Each one has an alias name which can be used when specifying a validation rule.

Active Record provides an object-oriented interface for accessing and manipulating data stored in databases. An Active Record class is associated with a database table, an Active Record instance corresponds to a row of that table, and an attribute of an Active Record instance represents the value of a particular column in that row. Instead of writing raw SQL statements, you would access Active Record attributes and call Active Record methods to access and manipulate the data stored in database tables. For example, assume Customer is an Active Record class which is associated with the customer table and name is a column of the customer table. You can write the following code to insert a new row into the customer table:. The above code is equivalent to using the following raw SQL statement for MySQL, which is less intuitive, more error prone, and may even have compatibility problems if you are using a different kind of database:. In this tutorial, we will mainly describe the usage of Active Record for relational databases.

The latter is invoked by the former implicitly when you call one of the query methods. All the query building methods return the query object itself, which allows you to chain multiple calls together. You can specify columns to be selected in either an array or a string, like the following. The column names being selected will be automatically quoted when the SQL statement is being generated from a query object. For example,. If you are using the array format to specify columns, you can also use the array keys to specify the column aliases. For example, the above code can be rewritten as follows,. Besides column names, you can also select DB expressions. You must use the array format when selecting a DB expression that contains commas to avoid incorrect automatic name quoting.

Yii2 find one

These methods can be chained together. A more detailed usage guide on how to work with Query can be found in the guide article on Query Builder. Whether to select distinct rows of data only. The table s to be selected from.

Jem wolfie onlyfans leaks

For example, given an attribute isPublic , we can declare a hint Whether the post should be visible for not logged in users , which provides user-friendly description of the attribute meaning and can be displayed to end users. Root fields extracted from the given nested fields. If the former, the field name will be treated as an object property name whose value will be used as the field value. When querying data through one of the querying methods , each newly populated Active Record will undergo the following life cycle:. Note: As this is a short-hand method only, using more complex conditions, like ['! This method overrides the parent implementation by checking if the named attribute is null or not. See getErrors for detailed description. To solve this performance problem, you can use the so-called eager loading approach as shown below,. The names of the attributes whose values may be returned if they are changed recently. Note: If you call select while eagerly loading relations, you have to make sure the columns referenced in the relation declarations are being selected. Attribute values name-value pairs to be saved into the table. Copy link. It does nothing otherwise. For this reason, we call it relation property. The relation name, e.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub?

We call such relational data accessing method lazy loading. Only when field names to be expanded are explicitly specified when calling toArray , will their values be exported. Sometimes you may even want to parametrize a relation declaration so that you can more easily perform dynamic relational query. That is, if a relation is defined with via or viaTable , you should not call inverseOf further. Returns the attribute names that are safe to be massively assigned in the current scenario. A list of errors. Null is returned if no error. First of all, you need to declare a Customer class with orders relation and extra field for count storage:. Whether there is any handler attached to the event. Because user B was actually working on an outdated version of the article, it would be desirable to have a way to prevent him from saving the article and show him some hint message. Deprecated since 2.