fix

blog/laravel/debugbar.md

@@ -7,10 +7,13 @@ composer8 require barryvdh/laravel-debugbar
 ```
 
 生成一个配置文件
+
 ```bash
 php8 artisan vendor:publish --provider="Barryvdh\Debugbar\ServiceProvider"
 ```
 
+需要配合view模板使用
+
 页面底部的调试工具
 
 ```php

blog/laravel/index.md

@@ -42,4 +42,11 @@ dev:
 
 [模型的关联查询](/blog/laravel/model-relation-query.md)
 
+[Debugbar 调试器](/blog/laravel/debugbar.md)
+
 [模型的预加载](/blog/laravel/model-preload.md)
+
+[模型的关联写入](/blog/laravel/model-relation-write.md)
+
+
+https://www.bilibili.com/video/BV1gE411j78F?p=32&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
\ No newline at end of file

blog/laravel/model-relation-query.md

@@ -157,5 +157,3 @@ select `user`.*,
 (select count(*) from `book` where `user`.`id` = `book`.`user_id` and `user_id` = ?) as `books_count` 
 from `user`
 ```
-
-https://www.bilibili.com/video/BV1gE411j78F?p=29&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
\ No newline at end of file

blog/laravel/model-relation-write.md

+# 模型的关联写入
+
+模型
+
+```php
+class User extends Model
+{
+    protected $table = 'user';
+    // 一对多关联 Book 表
+    public function books()
+    {
+        return $this->hasMany(Book::class, 'user_id', 'id');
+    }
+}
+
+
+class Book extends Model
+{
+    protected $table = 'book';
+
+    // 取消批量赋值限制
+    protected $guarded = []; 
+    
+    // 取消自动时间字段
+    // public $timestamps = false;
+
+    // 时间字段
+    public const CREATED_AT = 'create_time';
+    public const UPDATED_AT = 'update_time';
+
+    // 反向关联
+    public function user()
+    {
+        return $this->belongsTo(User::class, 'user_id', 'id');
+    }
+}
+
+```
+
+## 关联写入
+
+```php
+//先限定用户
+$user = User::find(1); 
+//给这个用户关联的 book 新增一条记录 
+//user_id 会自动写入 19，title 自定义
+
+$user->books()->save(new Book(['title'=>'《哈利波特》']));
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)
+```
+
+
+## 批量新增
+
+```php
+$user = User::find(1);
+ 
+$user->books()->saveMany([
+    new Book(['title' => '《哈利波特》']),
+    new Book(['title' => '《指环王》']) 
+]);
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1
+-- [1]
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)
+-- ["《哈利波特》",1,"2022-07-15 09:44:17","2022-07-15 09:44:17"]
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)
+-- ["《指环王》",1,"2022-07-15 09:44:17","2022-07-15 09:44:17"]
+```
+
+## 插入数组新增
+
+```php
+$user = User::find(1);
+
+$user->books()->create([ 'title' => '《哈利波特》']);
+
+```
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- params: [1]  
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)  
+-- params: ["《哈利波特》",1,"2022-07-15 09:48:14","2022-07-15 09:48:14"]  
+```
+
+## 批量插入数组
+
+```php
+$user = User::find(1);
+
+$user->books()->createMany([ 
+    ['title' => '《哈利波特》'], 
+    ['title' => '《指环王》']
+]);
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)  
+-- ["《哈利波特》",1,"2022-07-15 09:49:56","2022-07-15 09:49:56"]  
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)  
+-- ["《指环王》",1,"2022-07-15 09:49:56","2022-07-15 09:49:56"]  
+```
+
+PS:还有 findOrNew、firstOrNew、firstOrCreate 和 updateOrCreate 方法
+
+> 区别：
+- new    没有保存到数据库，没有id
+- create 会保存到数据库，有id
+
+## findOrNew
+
+```php
+$user = User::find(1);
+
+return $user->books()->findOrNew(20);
+```
+
+```json
+{
+    "user_id": 1
+}
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+select * from `book` where `book`.`user_id` = ? and `book`.`user_id` is not null and `book`.`id` = ? limit 1  
+-- [1,20]  
+```
+
+## firstOrNew
+
+```php
+$user = User::find(1);
+
+return $user->books()->firstOrNew([
+    'title' => '《哈利波特》'
+]);
+```
+
+```json
+{
+    "id": 3,
+    "user_id": 1,
+    "title": "《哈利波特》",
+    "create_time": "2022-07-15T01:43:21.000000Z",
+    "update_time": "2022-07-15T01:43:21.000000Z",
+    "delete_time": null
+}
+```
+
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1
+-- [1]  
+
+select * from `book` where `book`.`user_id` = ? and `book`.`user_id` is not null and (`title` = ?) limit 1  
+-- [1,"《哈利波特》"]  
+```
+
+## firstOrCreate
+
+```php
+$user = User::find(1);
+
+return $user->books()->firstOrCreate([
+    'title' => '《西游记》'
+]);
+```
+
+```json
+{
+    "title": "《西游记》",
+    "user_id": 1,
+    "update_time": "2022-07-15T01:56:00.000000Z",
+    "create_time": "2022-07-15T01:56:00.000000Z",
+    "id": 9
+}
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+select * from `book` where `book`.`user_id` = ? and `book`.`user_id` is not null and (`title` = ?) limit 1  
+-- [1,"《西游记》"]  
+
+insert into `book` (`title`, `user_id`, `update_time`, `create_time`) values (?, ?, ?, ?)  
+-- ["《西游记》",1,"2022-07-15 09:56:00","2022-07-15 09:56:00"]  
+```
+
+## updateOrCreate
+
+```php
+$user = User::find(1);
+
+return $user->books()->updateOrCreate([
+    'title' => '《水浒传》'
+], [
+    'delete_time' => '2022-07-15 10:00:13'
+]);
+```
+
+```json
+{
+    "id": 10,
+    "user_id": 1,
+    "title": "《水浒传》",
+    "create_time": "2022-07-15T02:00:13.000000Z",
+    "update_time": "2022-07-15T02:05:02.000000Z",
+    "delete_time": "2022-07-15 10:00:13"
+}
+```
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+select * from `book` where `book`.`user_id` = ? and `book`.`user_id` is not null and (`title` = ?) limit 1  
+-- [1,"《水浒传》"]  
+
+update `book` set `delete_time` = ?, `book`.`update_time` = ? where `id` = ?  
+-- ["2022-07-15 10:00:13","2022-07-15 10:05:02",10]  
+```
+
+## 关联删除
+
+```php
+// 删除 user_id=19 的书 
+$user = User::find(99); 
+$user->books()->delete();
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+delete from `book` where `book`.`user_id` = ? and `book`.`user_id` is not null  
+-- [1]  
+```
+
+## 关联修改
+
+```php
+// 修改 user_id=19 的书 
+$user = User::find(1);
+$user->books()->update(['title'=> '《修改书籍》'])
+```
+
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [1]  
+
+update `book` set `title` = ?, `book`.`update_time` = ? where `book`.`user_id` = ? and `book`.`user_id` is not null  
+-- ["《修改书籍》","2022-07-15 10:09:08",1]  
+```
+
+## 修改关联的外键
+
+```php
+// 修改掉书籍关联的用户，即:user_id 修改，换用户 
+$user = User::find(2);
+
+$book = Book::find(1);
+$book->user()->associate($user);
+$book->save();
+
+```
+```sql
+select * from `user` where `user`.`id` = ? limit 1  
+-- [2]  
+
+select * from `book` where `book`.`id` = ? limit 1  
+-- [1]  
+
+update `book` set `user_id` = ?, `book`.`update_time` = ? where `id` = ? 
+-- [2,"2022-07-15 10:11:31",1]  
+
+```
+
+```php
+// PS:如果想取消一本书的拥有者，
+// 比如将 user_id 设置为 null，字段要设置可以 null; 
+$book = Book::find(1);
+$book->user()->dissociate();
+$book->save();
+```
+
+```sql
+select * from `book` where `book`.`id` = ? limit 1  
+-- [1]  
+
+update `book` set `user_id` = ?, `book`.`update_time` = ? where `id` = ?  
+-- [null,"2022-07-15 10:13:34",1]  
+```
+
+
+## 默认模型
+
+搜索书籍的对应用户的时候，空null字段会导致用户出现null数据
+
+采用空对象默认模型的方式，去解决这个问题
+
+```php
+//Book.php
+public function user()
+{
+    return $this->belongsTo(User::class, 'user_id', 'id')
+               ->withDefault([
+                'id' => 0,
+                'name' => '游客用户'
+            ]);
+}
+```
+
+```php
+$book = Book::find(1);
+$book->load(['user']);
+
+return $book;
+```
+
+```json
+{
+    "id": 1,
+    "user_id": null,
+    "title": "《三国演义》",
+    "create_time": "2022-07-15T02:10:44.000000Z",
+    "update_time": "2022-07-15T02:13:34.000000Z",
+    "delete_time": null,
+    "user": {
+        "id": 0,
+        "name": "游客用户"
+    }
+}
+```
+
+```sql
+select * from `book` where `book`.`id` = ? limit 1  
+-- [1]  
+
+select * from `user` where 0 = 1
+-- []
+```
\ No newline at end of file