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laravel - 具有自定义名称的 hasMany、belongsTo、belongsToMany 参数？

问题描述

我有这些数据库表：

author (atr_id pk)                              // model : Author
category (ctg_id pk)                            // model : Category
post (pst_id pk, pst_atr_id fk)                 // model : Post
post_categories (pct_pst_id fk, pct_ctg_id fk)  // pivot : PostCategories

如何使用自定义名称定义 hasMany、belongsTo、belongsToMany 参数？

型号：作者

public function getPosts()
{
    return $this->hasMany('App\Post', ?, ?);
}

型号 : 邮政

public function getAuthor()
{
    return $this->belongsTo('App\Author', ?, ?);
}

public function getCategories()
{
    return $this->belongsToMany('App\Category', ?, ?, ?);
}

型号 : 类别

public function getPosts()
{
    return $this->belongsToMany('App\Post', ?, ?, ?);
}

标签： laravellaravel-5eloquent

解决方案

型号：作者

<?php

public function getPosts(){
     return $this->hasMany('App\Post','pst_atr_id');// author table's foreign key in Post table.
}

型号 : 邮政

<?php

 public function getAuthor(){
     return $this->belongsTo('App\Author','pst_atr_id','atr_id'); // first is foreign key of author table in this current table and second is primary key name of author table.
 }

 public function getCategories(){
     return $this->belongsToMany('App\Category','post_categories','pct_pst_id ','pct_ctg_id'); /* 'post_categories' is the pivot table. Rest 2 parameters- first is foreign key present in post_categories of the current model, second is foreign key present in post_categories of the model we are relating with*/
 }

型号 : 类别

<?php

 public function getPosts(){
      return $this->belongsToMany('App\Post','post_categories ','pct_ctg_id','pct_pst_id');

    /* 'post_categories' is the pivot table. Rest 2 parameters- first is foreign key present in post_categories of the current model, second is foreign key present in post_categories 
     of the model we are relating with*/
 }

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