Laravel：如何使用多个数据透视表关系 [英] Laravel: How to use multiple pivot table relationships
问题描述
我是新定义关系和框架在一起，我只是习惯了原始的sql。
Heres是相关信息：
用户表：
表：用户
id - int（自动递增）
username - varchar
挑战表：
表：挑战
id - int（auto increment）
name - varchar
User_challenge_links
表User_challenge_links
id - int（自动递增）
user_id - int
challenge_sub_categories_id - int
Challenge_sub_categories
Table Challenge_sub_categoriespre>
id - int（auto increment）
category_id -
sub_category_id -
challenge_id -
所以我的目标.. user->挑战。
class User extends Eloquent
{
protected $ table =users;
public function challenges（）{
// get user->挑战
}
}
关系：
- 用户有许多User_challenge_links
- User_challenge_link有一个challenge_sub_categories_id（因此是一个challenge_sub_category）
- Challenge_sub_categories的challenge_id符合挑战表中的挑战
任何帮助，甚至指向正确的方向， ！
编辑：
示例数据：
用户数据
用户
id name
1Sjaak
2Henk
类别资料
id name
1Foo
2Bar
子类别资料
id name
1SubFoo
2SubBar
挑战资料
ID名称
1Swing dat Foo
2Bar all the things
3Foo The Bars
Challenge_sub_categories Data
id category_id sub_category_id challenge_id
1 1 1 1
2 2 1 1
3 1 2 2
4 2 1 3
5 2 2 2
User_challenge_links数据
id user_id Challenge_sub_categories_id
1 1 1
2 1 3
3 2 2
4 2 3
5 2 4
数据流：
用户可以创建类别或使用现有类别并将挑战链接到现有或新的类别。但是，用户还可以选择使用子类别，然后他将链接到类别，并将挑战链接到该类别。
因此，类别是必需的，但子类别不是。然而，如果使用子类别（再次存在或新的），挑战将被连接到该子类别。
注意：子类别可连接到多个类别
类别 - 房子
子类别 - 清洁
挑战 - 获得特殊肥皂
类别 - 汽车
子类别 - 清洁
挑战 - 获取特殊肥皂
类别 - 洗澡
挑战 - 获取特殊肥皂
这是一些可能的情况
我尝试保持命名尽可能简单。
用户
id
用户名
challenge_user
user_id
challenge_id
挑战
id
name
topic_id
category_id
主题
id
名称
类别
id
名称
定义你的口才模型
class User extends Eloquent {
public function challenges（）{
return $ this-> belongsToMany（'Challenge'）;
}
}
类挑战扩展Eloquent {
public function users（）{
return $ this-> belongsToMany（'User'）;
}
public function topic（）{
return $ this-> belongsTo（'Topic'）;
}
public function category（）{
return $ this-> belongsTo（'Category'）;
}
}
class Topic extends Eloquent {
public function challenges（）{
return $ this-> hasMany（'Challenge'）;
}
}
class类别extends Eloquent {
public function challenges（）{
return $ this-> hasMany（'Challenge'）;
}
}
使用你的Eloquent模型...只是一些例子你可以做什么。
//主题名称的所有挑战的集合
主题:: with ） - > whereName（$ topic_name） - > first（） - > challenges;
//按类别名称收集所有挑战
类别:: with（'chall'） - > whereName（$ category_name） - > first（） - &
//通过Challenge id
收集所有用户Challenge :: with（'users'） - > find（$ challenge_id） - > users;
//至少有2个挑战的用户集合
User :: has（'challenges'，'>'，1） - > get
//将挑战附加到用户
$ user = User :: find（$ id）;
$ user-> challenges（） - > attach（$ challenge_id）;
//为挑战分配主题
$ challenge = Challenge :: find（$ challenge_id）;
$ topic = Topic :: find（$ topic_id）;
$ challenge-> topic（） - > associate（$ topic）;
$ challenge-> save（）;
参考和建议阅读：
Laravel雄辩的关系 belongsTo belongsToMany hasMany
查询关系 Model :: has（）
热切加载 Model :: with（）
访问关系的动态属性解决 $ model->关系
插入相关模型 attach（） associate（）
使用数据透视表如果需要从数据透视表中检索其他数据。
I'm new to defining relationships and frameworks all together, I´m just used to raw sql. Did my homework (google + laravel documentation) but I think I'm just not understanding it properly.
Heres is the relevant information: User Table:
Table: Users
id - int (auto increment)
username - varchar
Challenges Table:
Table: Challenges
id - int (auto increment)
name - varchar
User_challenge_links
Table User_challenge_links
id - int (auto increment)
user_id - int
challenge_sub_categories_id - int
Challenge_sub_categories
Table Challenge_sub_categories
id - int (auto increment)
category_id -
sub_category_id -
challenge_id -
So my goal.. user->challenges.
class User extends Eloquent
{
protected $table = "users";
public function challenges() {
// get user-> challenges
}
}
The relationships:
- A user has many User_challenge_links
- A User_challenge_link has a challenge_sub_categories_id (thus a challenge_sub_category)
- A challenge_id from challenges_sub_categories matches a challenge in the challenges table
Any help, even pointing me in the right direction will be much appreciated!
Edit: example data: Users Data
Users
id name
1 "Sjaak"
2 "Henk"
Categories Data id name 1 "Foo" 2 "Bar"
Sub_categories Data id name 1 "SubFoo" 2 "SubBar"
Challenges Data id name 1 "Swing dat Foo" 2 "Bar all the things" 3 "Foo The Bars"
Challenge_sub_categories Data
id category_id sub_category_id challenge_id
1 1 1 1
2 2 1 1
3 1 2 2
4 2 1 3
5 2 2 2
User_challenge_links Data
id user_id Challenge_sub_categories_id
1 1 1
2 1 3
3 2 2
4 2 3
5 2 4
Dataflow:
A user can create categories or use existing ones and link challenges to them (existing or new). However a user can also choose to use a sub category, which he then links to a category and link challenges to that instead.
So, a category is mandatory, but a sub_category isn't. If however a sub_category is used (again.. existing or new) the challenge will be connected to that sub category.
Note: A sub category CAN be connected to multiple categories
category - House
sub_category - Cleaning
Challenge - getting special soap
category - Car
sub_category - Cleaning
Challenge - getting special soap
category - Showering
Challenge - getting special soap
These are some possible situations
This setup should get you going. I tried to keep the naming as simple as possible.
users
id
username
challenge_user
user_id
challenge_id
challenges
id
name
topic_id
category_id
topics
id
name
categories
id
name
Defining your Eloquent Models
class User extends Eloquent {
public function challenges() {
return $this->belongsToMany('Challenge');
}
}
class Challenge extends Eloquent {
public function users() {
return $this->belongsToMany('User');
}
public function topic() {
return $this->belongsTo('Topic');
}
public function category() {
return $this->belongsTo('Category');
}
}
class Topic extends Eloquent {
public function challenges() {
return $this->hasMany('Challenge');
}
}
class Category extends Eloquent {
public function challenges() {
return $this->hasMany('Challenge');
}
}
Using your Eloquent Models ... just some exmaples of what you can do.
// Collection of all Challenges by Topic name
Topic::with('challenges')->whereName($topic_name)->first()->challenges;
// Collection of all Challenges by Category name
Category::with('challenges')->whereName($category_name)->first()->challenges;
// Collection of all Users by Challenge id
Challenge::with('users')->find($challenge_id)->users;
// Collection of Users with atleast 2 Challenges
User::has('challenges', '>', 1)->get();
// Attach Challenge to User
$user = User::find($id);
$user->challenges()->attach($challenge_id);
// Assign a Topic to a Challenge
$challenge = Challenge::find($challenge_id);
$topic = Topic::find($topic_id);
$challenge->topic()->associate($topic);
$challenge->save();
References and suggested reading:
Laravel Eloquent Relationships belongsTo belongsToMany hasMany
Querying relations Model::has()
Eager Loading Model::with()
Dynamic Properties for Accessing Relations Resolve $model->relationship
Inserting related Models attach() associate()
Working with Pivot tables If you need to retrieve extra data from the pivot table.
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