违反完整性约束:1048列"taggable_id"不能为空 [英] Integrity constraint violation: 1048 Column 'taggable_id' cannot be null

问题描述

我正在尝试设置 laravel-tagging ，它似乎最受欢迎Laravel的标签系统.但不幸的是，它没有任何前端功能.有一个指南为此，我彻底进行了跟踪.最后，尝试创建标签时遇到错误:

I am trying to set up laravel-tagging, which seems to be the most popular tagging system for Laravel out there. But unfortunately it doesn't come with any front-end features. There is a guide for it that I followed through thoroughly. At the end, I run into error while trying to create a tag:

SQLSTATE [23000]:违反完整性约束:1048列 'taggable_id'不能为null(SQL:插入tagging_tagged (tag_name，tag_slug，taggable_type，taggable_id)值 (奶酪，奶酪，App \链接，))

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'taggable_id' cannot be null (SQL: insert into tagging_tagged (tag_name, tag_slug, taggable_type, taggable_id) values (Cheese, cheese, App\Links, ))

我发现了其他一些帖子，人们遇到了类似的错误，例如 this ，此和

I found several other posts where people ran into similar errors, such as this, this and this. But none of them provide a definitive solution. People, and the common sense, say that the model that contains taggable_id should be saved so the tag gets stored in the database. My code for the controller looks like this:

public function storeStuff(Request $request)
{
    // Create the link first
    $link = new Links;

    // Now add tags
    $link->tag(explode(',', $request->tags));

    // Try to save tags?
    $link->save();
}

在我的情况下，我尝试使用$link->save();保存它的尝试无效.我仍然遇到相同的错误，并且包含taggable_id列的数据库表tagging_tagged仍然充满空值.有人对如何解决此问题有任何建议吗?

My attempt to save it using $link->save(); in my case doesn't work. I still get the same error and my database table tagging_tagged, which contains taggable_id column is still full of nulls. Does anyone have any advice on how to approach this problem?

编辑:我通过添加另一个保存来工作，如Tobias Karlsson建议的那样:

I got it to work by adding another save as suggested by Tobias Karlsson:

    $link = new Links;
    $link->tag_name = $request->tags;
    $link->save();

    // Now add tags
    $link->tag(explode(',', $request->tags));

    $link->save();

我还必须添加时间戳以修复丢失的created_at错误.时间戳不包含在laravel-tagging软件包随附的初始迁移中，即使我不确定它们是否对标签有用.我的tagging_tagged表现在看起来像这样:

I also had to add timestamps to fix missing created_at error. Timestamps are not included in initial migration that comes with laravel-tagging package, even though I am not sure if they are useful for tags. My tagging_tagged table now looks like this:

FIELD         TYPE              NULL   KEY
id            int(10)unsigned   NO     PRI      auto_increment
taggable_id   int(10)unsigned   NO     MUL      
taggable_type varchar(255)      NO     MUL      
tag_name      varchar(255)      NO          
tag_slug      varchar(255)      NO     MUL      
created_at    timestamp         YES         
updated_at    timestamp         YES         

我仍在尝试使用Javascript自动填充标签.一切正常后，我将更新此问题.

I am still trying to get Javascript to autofill tags. I will update this question once I get it all working.

推荐答案

您将必须先保存模型，然后设置标签，然后再次保存.

You will have to save the model first and then set tags and then save again.

$link = new Links;
$link->someProperty = $request->someProperty;

// Save model to get a taggable_id (model id).
$link->save();

// Now add tags
$link->tag(explode(',', $request->tags));

// Save tags.
$link->save();

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