php - Laravel (5.7) Eloquent Many to Many with query on双方

Question

假设我有一个用户、角色和一个数据透视表。我为角色和用户设置了 belongsToMany。

用户模型：

<?php

namespace App;

...
use App\Models\Role;

class User extends Authenticatable
{
  ...
  public function roles()
  {
    return $this->belongsToMany(Role::class, "UserRoles", "userId", "roleId")
                ->withPivot("read", "write", "update", "delete")
                ->withTimestamps();
  }
}

榜样：

<?php

namespace App\Models;

...
use App\User;

class Role extends Model
{
  ...
  public function users()
  {
    return $this->belongsToMany(User::class, "UserRoles", "roleId", "userId")
                ->withPivot("read", "write", "update", "delete")         
                ->withTimestamps();
  }

}

表“用户”：

userId username
1      admin
2      johndoe
3      menghour

表“角色”：

roleId roleName
1      Admin
2      HR
3      Account

数据透视表“用户角色”：

id     userId   roleId   read   write   update   delete
1      1        1        1      1       1        1
2      1        2        1      1       1        1
3      1        3        1      1       1        1
4      2        2        1      0       0        0
5      3        3        1      1       1        0

我的问题是如何在数据透视表中获取过滤器。

例如：我只想过滤userId或过滤roleId两者userId and roleId

如果我user = admin在刀片模板中选择，我想获取用户拥有的所有角色。预期结果：

username    roleName

admin       Admin
admin       HR
admin       Account

如果我在刀片模板中选择选项role = HR，我想获取该角色拥有的所有用户。预期结果：

username    roleName

admin       HR
johndoe     HR

如果我选择选项user = adminand role = HR，我只想获得特定的用户和角色。预期结果：

username    roleName

admin       HR

我累了：

User::whereHas("roles", function ($query) use ($request) {
      if ($request->userId) {
        $query->where("userRoles.userId", "=", $request->userId);
      }
      if ($request->roleId) {
        $query->where("userRoles.roleId", "=", $request->roleId);
      }
    })->get();

注意：我使用的是 Laravel 5.7

标签： phplaraveleloquentmany-to-manyrelationship

Answer 1

您可以尝试使用此查询根据您的示例过滤数据。

该函数whereHas用于检索具有给定角色的所有用户。要获取用户的角色，您必须使用with函数。

$user = User::whereHas('roles', function ($query) use ($request) {
            if ($request->roleId) {
                $query->where("userRoles.roleId", "=", $request->roleId);
            }
        })
        // It will give you the user's role data.
        ->with('roles');

// It will check in users table if you have applied the filter by user.
if ($request->userId) {
    $user = $user->where("users.id", "=", $request->userId);
}

$user = $user->get();

您还可以尝试使用此查询根据您的示例过滤数据。此查询将为您提供具有您在角色对象中给出的特定角色的用户。例如：如果您在刀片模板中选择选项角色 = HR。

$user = User::whereHas('roles', function ($query) use ($request) {
        if ($request->roleId) {
            $query->where("userRoles.roleId", "=", $request->roleId);
        }
    })
    // It will give you the user data with a particular given role which you has passed in the request.
    ->with(['roles' => function($query) use($request) {
        if ($request->roleId) {
            $query->where("roles.id", "=", $request->roleId);
        }
    }]);

// It will check in users table if you have applied the filter by user.
if ($request->userId) {
    $user = $user->where("users.id", "=", $request->userId);
}

$user = $user->get();