Detailed explanation of the two ways of Laravel model events

LaravelApplication of 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.

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

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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

<?php namespace App;

use Illuminate\Database\Eloquent\Model;

class Log extends Model
{
    protected $fillable = [&#39;user_name&#39;, &#39;user_id&#39;, &#39;url&#39;, &#39;event&#39;, &#39;method&#39;, &#39;table&#39;, &#39;description&#39;];
}

• 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

<?php use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateLogsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create(&#39;logs&#39;, function (Blueprint $table) {
            $table->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 the providers array in /config/app.php Register (roughly as shown in the picture)

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

##Create a new observer inheriting the base class

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

##To the newly created service provider

ObserverLogServiceProvider

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

attach

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Method)

• 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

listen

The attribute is bound to the event

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

attach

or detach

##

3. Event listenerPermissionRoleEventLog also inherits the base class LogBaseServer, here it is traversed according to the incoming array id, and then creates a log

4. Then apply the event

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• Update Handle login and logout events gracefully

1. Bind the subscribe attribute in EventServiceProvider to a well-handled class

2. Methods of the event listening class

3. After The effect is like this:

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