如何建立这种关系并在Laravel中访问数据

Question

我有4张桌子：

表名：客户

栏位：编号，名称，子弹头

表名：项目

栏位：id，子弹

表名称：project_translation

字段：id，语言环境，project_id，标题

表名称：client_project

字段：id，client_id，project_id

关系

在项目模型中

public function clients()
    {
        return $this->belongsToMany(Client::class,'client_project')->withTimestamps();
        //return $this->belongsToMany('Client')->withTimestamps()->orderBy('priority', 'desc');
    }

在客户端模型中

public function projects()
    {
        return $this->belongsToMany(Project::class,'client_project')->withTimestamps();
    }
    public function translate()
    {
        return $this->belongsToMany(ProjectTranslation::class,'project_translations')->withTimestamps();
    }

在Client_Project模型中

public function clients()
    {
        return $this->hasMany('App\Models\Project');
    }
    public function projects()
    {
        return $this->hasOne('App\Models\Client');
    }   

在ProjectTranslation模型中

public function client()
    {
        return $this->hasMany('App\Models\Client');

    }

我试图像这样访问控制器中的数据 ：

$client_project = Client::find($id)->translate;
        return $client_project;

这给了我下一个错误：

SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique 
table/alias: 'project_translations' (SQL: select 
`project_translations`.*, `project_translations`.`client_id` as 
`pivot_client_id`, `project_translations`.`project_translation_id` as 
`pivot_project_translation_id`, `project_translations`.`created_at` as 
`pivot_created_at`, `project_translations`.`updated_at` as 
`pivot_updated_at` from `project_translations` inner join 
`project_translations` on `project_translations`.`id` = 
`project_translations`.`project_translation_id` where `project_translations`.`client_id` = 22)

我不确定，但是我认为人际关系出了点问题。

我在客户端刀片中，我想显示此客户端项目的项目翻译。

Answer 1

正如我在评论中所说，我不是Laravel用户，在这里我格式化了您的查询使其可读。 但是我知道Sql

select 
    `project_translations`.*,
    `project_translations`.`client_id` as `pivot_client_id`,
    `project_translations`.`project_translation_id` as `pivot_project_translation_id`,
    `project_translations`.`created_at` as `pivot_created_at`,
    `project_translations`.`updated_at` as `pivot_updated_at`
from 
    `project_translations`  <-- Duplicate Table with no alias
inner join 
    `project_translations` on `project_translations`.`id` = `project_translations`.`project_translation_id`
where
    `project_translations`.`client_id` = 22

Answer 2

您不需要Client_Project模型。

在项目模型中

public function clients()
{
    return $this->belongsToMany(Client::class,'client_project')->withTimestamps();
}

public function translates()
{
    return $this->hasMany(ProjectTranslation::class);
}

在客户端模型中 ：

public function projects()
{
    return $this->belongsToMany(Project::class,'client_project')->withTimestamps();
}

在ProjectTranslation模型中 ：

public function project()
{
    return $this->belongsTo('App\Models\Project');
}

在控制器中：

$client_projects = Client::find($id)->projects; //all client projects
return $client_projects;

在获取此$client_projects并对其进行循环之后，在视图中，您可以通过以下方式获取项目的翻译：

$client_project->translates  // for single projects you will get its translates :)

对于项目你有很多很多与客户，它有一对多翻译=>在文档中链接的例子还有很多:)