laravel一对一的关系 [英] laravel one to one relationship

问题描述

我有 xml_document 表包含这些列：

  id 
 general_information_id 
  

我有 general_information 具有以下列：

  id 
 domain 
 log_file 
  
 
 
 
它们之间的关系是一对一的。
 
 
 
我是否正确建立关系？或者，我需要向 general_information 表中添加 xml_document_id 列。
 
 
 
其次：
 
 
 
我向 xml_doucment 添加了一行，现在我想添加一行 general_information 并将此新行链接到 xml_document  
 
 
 
我试过这个：
  $ xmlDocument = XmlDocument :: find（Input :: get（4））; 
 $ generalInformation = new GeneralInformation（$ dataGeneralInformation）; 
 $ generalInformation-> xmlDocument（） - > associate（$ xmlDocument）; 
 // $ xmlDocument-> generalInformation（） - > attach（$ generalInformation）; 
 $ generalInformation-> save（）; 
 $ xmlDocument-> save（）; 
  
但我错误地显示 xml_document_id 不存在于 general_information 表中。
 
 
 
我试图替换 associate 与 attach 但是我得到 attach 不是一个存在的函数。
 
 
 
请帮我我试过这个一对一的关系，我不知道是什么是正确的方式做id。我不知道在数据库中添加列以及在模型中做什么。我尝试了很多事情，但仍然这么困惑。
 
 
 
更新1 
 
 
 
  class GeneralInformation extends Eloquent {
 ..... 
 public function xmlDocument（）{
 return $ this-> belongsTo（'XmlDocument'）; 
} 
} 
 
 
 class XmlDocument extends Eloquent {
 .... 
 public function generalInformation（）{
 return $ this-> hasOne（'GeneralInformation'，'general_information_id'）; 
} 
} 
  
 
 
解决方案
 make a  one-to-one 关系，你需要将子表中的父表的主键存储为a 外键。因此，如果 xml_document 是父代，如果它包含许多 general_information ，则 id  xml_document 中的<$ c>字段应该存在于 general_information 表中 xml_document_id 。
 
 
 
所以，你可以这样构建一对一关系： 
  // xml_document模型
 public function generalInfo（）
 {
 return $ this- > hasOne（'GeneralInformation'）; 
} 
  
然后声明 GeneralInformation 模型。
 
I have xml_document table with these columns:
id
general_information_id
I have general_information table with these columns:
id
domain
log_file
The relationship between them is one to one.

Have I build the relationship correctly? Or I need to add xml_document_id column to the general_information table.

Secondly:

I have added a row to the xml_doucment and now I want to add a row to the general_information and link this new row to the xml_document

I tried this:
 $xmlDocument = XmlDocument::find(Input::get(4));
            $generalInformation = new GeneralInformation($dataGeneralInformation);
            $generalInformation->xmlDocument()->associate($xmlDocument);
            //$xmlDocument->generalInformation()->attach($generalInformation);
            $generalInformation->save();
            $xmlDocument->save();
but I got error that xml_document_id column doesn't exist in the general_information table.

I tried to replace associate with attach but I got that attach is not an existed function.

please help me I am tried of this one to one relationship, I couldn't know what is the correct way to do id. I don't know where to add columns in the database and what to do in the models. I have tried a lot of things but still so confused.

Update 1

class GeneralInformation extends  Eloquent{
.....   
public function xmlDocument(){
        return $this->belongsTo('XmlDocument');
    }
}


class XmlDocument extends Eloquent {
....
 public  function  generalInformation(){
        return $this->hasOne('GeneralInformation','general_information_id');
    }
}

解决方案
To make a one-to-one relationship, you need to store the primary key of parent table in the child table as a foreign key. So if xml_document is parent and if it contains many general_information then the id field of the xml_document should be present in in the general_information table as xml_document_id.

So, you may build the one-to-one relation like this:
// xml_document model
public function generalInfo()
{
    return $this->hasOne('GeneralInformation');
}
Then the declare the GeneralInformation model.

                        
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