雄辩的关系（Laravel 5.4）

Question

我正在做一个Laravel 5.4应用程序，但我很难搞清楚我应该如何构建我的数据与雄辩关系。

这是我的模型，我多么希望他们有关系：

• 学校→先后类，用户和事件

• 用户→可以属于一所学校。可以有班级和会话（含案例）

• 班级→属于学校。有用户和主题。可以有功课

• 主题→属于一类

• 会议→属于用户。能有案件

• 案例→属于会话

• 事件→属于学校

• 作业→属于一类

如何我应该用雄辩的关系函数来结构化（belongsTo，hasMany等等）在我的Laravel 5.4项目中？

Answer 1

假设类，用户和事件模型有一个属性school_id，您使用的主键是相应模型的id，您的类，用户，事件和学校模型应该如下所示。

学校

class School extends Model 
{ 
public function users(){ 
    return $this->hasMany('App\User'); 
} 

public function classes(){ 
    return $this->hasMany('App\Class'); 
} 

public function sessions(){ 
    return $this->hasMany('App\Session'); 
} 
} 

用户

class User extends Model 
{ 
public function school(){ 
    return $this->belongsTo('App\School'); 
} 

public function classes(){ 
    return $this->hasMany('App\Class'); 
} 

public function events(){ 
    return $this->hasMany('App\Event'); 
} 
} 

类

class Class extends Model 
{ 
public function school(){ 
    return $this->belongsTo('App\School'); 
} 

public function users(){ 
    return $this->hasMany('App\User'); 
} 

public function subjects(){ 
    return $this->hasMany('App\Subject'); 
} 
public function homeworks(){ 
    return $this->hasMany('App\Homework'); 
} 
} 

事件

class Class extends Model 
{ 
public function school(){ 
    return $this->belongsTo('App\School'); 
} 

} 

您可以使用这些关系来定义具有链接功能的查询。例如如果你想获得与具有一个id属性等于$ ID，你可以写一个学校相关的所有事件，

$events = App\School::find($id)->events; 

Laravel Documentation解释得很好

Answer 2

与学校模型和创建基础表，现在是创建关系的时候了。打开School模型并创建一个名为classes，users和events的公共方法;里面引用的hasMany方法：

学校：

class School extends Model { 

    public function classes() 
    { 
    return $this->hasMany('App\Class'); 
    } 
    public function users() 
    { 
    return $this->hasMany('App\User'); 
    } 
    public function events() 
    { 
    return $this->hasMany('App\Event'); 
    } 

} 

用户：

class User extends Model { 

    public function school(){ 
     return $this->belongsTo('App\School'); 
    } 

    public function classes(){ 
     return $this->hasMany('App\Class'); 
    } 

    public function sessions(){ 
     return $this->hasMany('App\Session'); 
    } 

} 

类：

class Class extends Model { 

    public function school(){ 
     return $this->belongsTo('App\School'); 
    } 

    public function users(){ 
     return $this->hasMany('App\User'); 
    } 

    public function subjects(){ 
     return $this->hasMany('App\Subject'); 
    } 

    public function homeworks(){ 
     return $this->hasMany('App\Homework'); 
    } 

} 

主题：

class Subject extends Model { 

    public function class(){ 
     return $this->belongsTo('App\Class'); 
    } 

} 

会议：

class Session extends Model { 

    public function user(){ 
     return $this->belongsTo('App\User'); 
    } 

    public function cases(){ 
     return $this->hasMany('App\Case'); 
    } 

} 

案例：

class Case extends Model { 

    public function session(){ 
     return $this->belongsTo('App\Session'); 
    } 

} 

事件：

class Event extends Model { 

    public function school(){ 
     return $this->belongsTo('App\School'); 
    } 

} 

作业：

class Homework extends Model { 

    public function class(){ 
     return $this->belongsTo('App\Class'); 
    } 

} 

有关的hasMany RELAT的更多细节ionship，请查看这里的链接：EasyLaravelBook

Answer 3

做，这是

学校

public function classes() 
{ 
    return $this->hasMany('App\Class'); 
} 

public function users() 
{ 
    return $this->hasMany('App\User'); 
} 

public function events() 
{ 
    return $this->hasMany('App\Event'); 
} 

CLASS

public function school() 
{ 
    return $this->belongsTo('App\School'); 
} 

public function subjects() 
{ 
    return $this->hasMany('App\Subject'); 
} 

public function homeworks() 
{ 
    return $this->hasMany('App\Homework'); 
} 


public function users() 
{ 
    return $this->belongsToMany('App\User','class_users','class_id','user_id'); 
    // this should be many to many because users can also have many classes 
} 

用户

正确的方法

public function school() 
{ 
    return $this->belongsTo('App\School'); 
} 

public function classes() 
{ 
    return $this->belongsToMany('App\Class','class_users','user_id','class_id'); 
    // this should be many to many as explained to class 
} 

public function sessions() 
{ 
    return $this->belongsToMany('App\Session','session_users','user_id','session_id'); 
    // like classes do, this should be many to many relationship because sessions can also have many users 
} 

SUBJECT

public function class() 
{ 
    return $this->belongsTo('App\Class'); 
} 

会议

public function users() 
{ 
    return $this->belongsToMany('App\User','session_users','session_id','user_id'); 
    // should be many to many as well 
} 

public function cases() 
{ 
    return $this->hasMany('App\Case'); 
} 

CASE

public function session() 
{ 
    return $this->belongsTo('App\Session'); 
} 

EVENT

public function school() 
{ 
    return $this->belongsTo('App\School'); 
} 

HOMEWORK

public function class() 
{ 
    return $this->belongsTo('App\Class'); 
}