Detailed explanation of the two ways of Laravel model events

When dealing with some user operation events on a daily basis, we sometimes need to record them , for later reference or big data statistics.

Laravel is very convenient to handle in model events: https://laravel-china.org/docs/laravel/5.5/eloquent#events

Laravel’s model There are two ways of events,

• SettingdispatchesEventsProperty mapping event class
• Use observers to register events, here is the second one
• New model

php artisan make:model Log

         

          Copy after login
         
        

• Create migration table:

php artisan make:migration create_logs_table

• The structure of the table is roughly like this, it can be designed as needed

engine = 'InnoDB'; $table->increments('id'); $table->string('user_id')->comment('操作人的ID'); $table->string('user_name')->comment('操作人的名字，方便直接查阅'); $table->string('url')->comment('当前操作的URL'); $table->string('method')->comment('当前操作的请求方法'); $table->string('event')->comment('当前操作的事件，create,update,delete'); $table->string('table')->comment('操作的表'); $table->string('description')->default(''); $table->timestamps(); }); DB::statement("ALTER TABLE `logs` comment '操作日志表'"); } /** * Reverse the migrations. * * @return void */ public function down() { Schema::dropIfExists('logs'); } }

• Run the migration to generate the table

php artisan migrate

• Create a new service provider to uniformly register all model event observers (the subsequent names can be more vivid)

php artisan make:provider ObserverLogServiceProvider

• to theprovidersarray in/config/app.phpRegister (roughly as shown in the picture)

##Create a new folder in the
• appdirectoryObserversStore model observers, and create a new base classLogBaseServerand build basic attributes in the constructor (CLI is because there is no user execution when executing from the command line)

LogBaseServer
• (Usermodel, method The name should correspond to the event in the document)

##To the newly created service provider

Run in

Register events for the required models (I have quite a few, it will probably look like this in the future )

Then we trigger some events (addition, deletion and modification, the table data will be available)

##Many-to-many association insertion will not trigger the model (such as

• At this time, you need to create a new event class to simulate (here is a rough introduction to assigning permissions to roles)
1. In
• EventServiceProvider

The attribute is bound to the event

2. Injection two in the eventPermissionRoleEventParameters, one is the role, the other is the array returned by

ordetach

##

3. Event listenerPermissionRoleEventLogalso inherits the base classLogBaseServer, here it is traversed according to the incoming array id, and then creates a log

4. Then apply the event

• Update Handle login and logout events gracefully

1. Bind thesubscribeattribute inEventServiceProviderto a well-handled class

2. Methods of the event listening class

3. After The effect is like this: