[英]Many to many relationship retrieve a column connected to pivot table in Laravel
[英]Laravel - Retrieve pivot relationship
我有以下数据库架构:
users
id
skills
id
skill_user
id
user_id
skill_id
endorsements
id
skill_user_id
Laravel 型号定义如下:
class User extends Authenticatable
{
public function skills()
{
return $this
->belongsToMany('App\Skill')
->using(SkillUser::class)
->withPivot('endorsements_count')
->orderBy('endorsements_count', 'desc');
}
}
class Skill extends Model
{
public function users()
{
return $this
->belongsToMany('App\User')
->using(SkillUser::class)
->withPivot('user_id');
}
}
class SkillUser extends Pivot
{
public function endorsements()
{
return $this->hasMany('App\Endorsement', 'skill_user_id', 'id');
}
}
class Endorsement extends Model
{
public function skill_user() {
return $this->belongsTo('App\SkillUser');
}
}
从上面可以看出, user
可以通过名为SkillUser
的多对多表连接多个skills
。 此外,每个用户的技能可以被其他用户认可( endorsement
)。 endorsements
连接在 pivot 表上(每个 user_skill 可以有多个背书)。
现在我试图弄清楚如何在 Laravel (Eloquent) 中构建一个查询,该查询将获取具有他所有技能的用户,并且对于每项技能,所有这些都是在单个查询中的认可。
当我执行以下操作时:
User::with('skills')->findOrFail(1)->skills[0]->pivot->endorsements
它正确返回了用户和技能信息,但是 pivot (UserSkill) 内部的背书是空的。 此外,当我检查枢轴-> 关系时,它也是空的。
另一方面,如果我这样查询:
SkillUser::where('id', '=', 1)->first()->endorsements
我正确地得到了所有的认可,所以我猜这种关系是正确建立的。 我想我错过了在 pivot 表中特别包含“认可”的方式。
任何帮助将不胜感激!
class Skill extends Model
{
public function endorsements()
{
return $this->hasMany(Endorsement::class, 'skill_user_id');
}
}
class Endorsement extends Model
{
public function user()
{
return $this->hasOne(User::class, 'id', 'user_id')->select(['id', 'firstname', 'lastname']);
}
}
class User extends Model
{
public function skills()
{
return $this->belongsToMany(Skill::class)->using(SkillUser::class)->select(['skill_user.id']);
}
}
我在endorsements
表中添加了endorser
者列以与用户关联。
return User::with('skills.endorsements.user')->findOrFail(1, ['id', 'name']);
它打印出这样的东西;
{
"id": 1,
"name": "my-user",
"skills": [
{
"id": 1,
"name": "askill",
"pivot": {
"user_id": 1,
"skill_id": 1
},
"endorsements": [
{
"id": 1,
"skill_user_id": 1,
"endorser": 2,
"user": {
"id": 2,
"name": "user-2"
}
},
{
"id": 2,
"skill_user_id": 1,
"endorser": 3,
"user": {
"id": 3,
"name": "user-3"
}
}
]
},
{
"id": 2,
"name": "bskill",
"pivot": {
"user_id": 1,
"skill_id": 2
},
"endorsements": [
{
"id": 3,
"skill_user_id": 2,
"endorser": 2,
"user": {
"id": 2,
"name": "user-2"
}
}
]
},
{
"id": 4,
"name": "dskill",
"pivot": {
"user_id": 1,
"skill_id": 4
},
"endorsements": []
}
]
}
这是在幕后执行的查询;
SELECT `id`, `name`
FROM `users`
WHERE `users`.`id` = '1'
LIMIT 1;
SELECT `skills`.*, `skill_user`.`user_id` as `pivot_user_id`, `skill_user`.`skill_id` as `pivot_skill_id`
FROM `skills`
inner join `skill_user` on `skills`.`id` = `skill_user`.`skill_id`
WHERE `skill_user`.`user_id` in ('1');
SELECT *
FROM `endorsements`
WHERE `endorsements`.`skill_user_id` in ('1', '2', '4');
SELECT `id`, `name`
FROM `users`
WHERE `users`.`id` in ('2', '3');
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