雄辯的關係（Laravel 5.4）

Question

我正在做一個Laravel 5.4應用程序，但我很難搞清楚我應該如何構建我的數據與雄辯關係。

這是我的模型，我多麼希望他們有關係：

• 學校→先後類，用戶和事件

• 用戶→可以屬於一所學校。可以有班級和會話（含案例）

• 班級→屬於學校。有用戶和主題。可以有功課

• 主題→屬於一類

• 會議→屬於用戶。能有案件

• 案例→屬於會話

• 事件→屬於學校

• 作業→屬於一類

如何我應該用雄辯的關係函數來結構化（belongsTo，hasMany等等）在我的Laravel 5.4項目中？

Answer 1

假設類，用戶和事件模型有一個屬性school_id，您使用的主鍵是相應模型的id，您的類，用戶，事件和學校模型應該如下所示。

學校

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'); 
} 
} 

用戶

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'); 
} 
} 

類

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'); 
} 

} 

您可以使用這些關係來定義具有鏈接功能的查詢。例如如果你想獲得與具有一個id屬性等於$ ID，你可以寫一個學校相關的所有事件，

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

Laravel Documentation解釋得很好

Answer 2

與學校模型和創建基礎表，現在是創建關係的時候了。打開School模型並創建一個名爲classes，users和events的公共方法;裏面引用的hasMany方法：

學校：

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'); 
    } 

} 

用戶：

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'); 
    } 

} 

類：

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'); 
    } 

} 

主題：

class Subject extends Model { 

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

} 

會議：

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'); 
    } 

} 

作業：

class Homework extends Model { 

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

} 

有關的hasMany RELAT的更多細節ionship，請查看這裏的鏈接：EasyLaravelBook

Answer 3

做，這是

學校

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 
} 

用戶

正確的方法

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'); 
} 

會議

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'); 
}