php - Integrity constraint violation: 1048 Column 'taggable_id' cannot be null

Question

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]: 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, AppLinks, ))

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();
}

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?

EDIT: 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();

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         

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

Answer 1

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();