How to work with composite primary keys in Yii Active Record?

To become a master of Yii, you need to master the following skills: 1) Understand Yii's MVC architecture, 2) Proficient in using ActiveRecordORM, 3) Effectively utilize Gii code generation tools, 4) Master Yii's verification rules, 5) Optimize database query performance, 6) Continuously pay attention to Yii ecosystem and community resources. Through the learning and practice of these skills, the development capabilities under the Yii framework can be comprehensively improved.

Fixture is a mechanism used to preload data in Yii tests. 1. Create a fixture class to inherit ActiveFixture and specify the model; 2. Set the dependency order through $depends; 3. Define data files in the data/directory; 4. Declare the use in the test class through the fixtures() method; 5. Yii automatically loads and cleans up the data after the test. For example, UserFixture will load user data in the tests/fixtures/data/user.php file. During testing, you can obtain the data of alice through $this->users['user1'] for assertion verification. Yii offers a variety of fi

In Yii, widgets are used to implement component multiplexing by encapsulating complex view logic. 1. Use the widget() method to call built-in widgets, such as LinkPager for pagination, and ActiveForm for creating model binding forms; 2. Common widgets include GridView to display table data, DetailView to display model details, and Menu build navigation menu; 3. Custom widgets can be created by inheriting yii\base\Widget, implementing the run() method and defining attributes to enhance reusability, as shown in the HelloWidget example. Mastering these core methods can improve view development efficiency.

Answer: To implement password reset in Yii2, you need to add password_reset_token and expiration time fields, generate a unique token and send it to the user's mailbox, and allow the user to set a new password by verifying the validity of the token, and finally clean the expired token. The specific steps include: 1. Modify the database to add token fields; 2. Implement the generatePasswordResetToken method in the User model to generate a time stamped token and set an hour validity period; 3. Create a PasswordResetRequestForm form to process the request, find the user and send an email with a reset link; 4. Define the strength of the ResetPasswordForm model to verify the new password

ToenabledebuggingmodeinYii,installandconfiguretheyii2-debugmodule.1.Checkifyii2-debugisinstalledviaComposerusingcomposerrequire--devyiisoft/yii2-debug.2.Inconfig/web.php,addthedebugmoduletobootstrapandmodulesunderYII_ENV_DEV.3.ConfirmYII_ENVisdefined

Write a custom SQL query in Yii and can be implemented through Yii::$app->db. The steps are as follows: 1. Create a query command using createCommand(); 2. Binding parameters through bindValue() or bindParam() to prevent SQL injection; 3. Call queryAll(), queryOne() and other methods to execute queries; 4. For insert and update operations, you can chain call insert() and update() methods; 5. It is recommended to write SQL directly and bind parameters; 6. If the result needs to be converted into a model, you can instantiate and set properties; 7. Use QueryBuilder to build secure queries first, and replies, and replies.

EnableGiiinconfig/web.phpbyaddingthemoduleandsettingallowedIPs,thenaccesshttp://your-app-url/index.php?r=gii,useModelGeneratortocreatemodelsfromdatabasetables,anduseCRUDGeneratortogeneratecontrollersandviewsforfullCRUDoperations.

Answer: To handle file upload in Yii, you need to set the form enctype to multipart/form-data, use the UploadedFile class to get the file, verify the file type through the model verification rules, and save the file in the controller. Make sure that the upload directory can be written and renamed for security.