Laravel: Column 'category_slug' cannot be null

Question

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'category_slug' cannot be null (SQL: update products set category_slug =?, products . updated_at = 2022-12-23 12:06:26 where id = 1)

How I get product category_slug colmun from category slug table.

Categories Table:

|id|name|slug | |4 |Cat4|cat-4| |5 |Cat5|cat-5| |6 |Cat6|cat-6|

Products Table

|id|name|category_id|category_slug| |1 |USDT|4 |cat-4 | |2 |BTCH|5 |cat-5 | |3 |EURT|6 |cat-6 |

Product Controller (Update Method)

    public function update(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:190',
            'price' => 'required',
            'category_id' => 'required',
        ])->validate();

        $code=Product::find($request->id);
        $code->name=$request->name;
        $code->category_id=$request->category_id;
        $code->category_slug=$request->category_slug;
    $code->update();

        return redirect()->back()->with('success',__('Product has been updated'));
    }

`

Product Model

`

class Product extends Model
{
    use HasFactory;

    public function category()
    {
        return $this->hasOne(Category::class,'id','category_id');
    }

`

I GET THIS ERROR

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'category_slug' cannot be null (SQL: update products set category_slug =?, products . updated_at = 2022-12-23 12:06:26 where id = 1)

Answer 1

I think you should not add the category_slug to your products table

you already have all the information you need about the product's category when you added the category_id to the products table

to get the category_slug from the product

you can do something like this

Product::with('category')->find(1)->category->slug 

Answer 2

Change your migration.

public function up()
{
    Schema::table('products', function (Blueprint $table) {
        $table->string('category_slug')->nullable()->change();
    });
}

It seems that you are not sending any value to the category_slug column while updating the record. The column must have a nullable constraint.

Answer 3

The problem lies here:

$code->category_slug=$request->category_slug;

It seems that $request->category_slug is null/undefined. If you are sure sending it from the frontend via an input make sure it has the right name attribute name="category_slug"

If however, you don't send it from frontend you should use slug helper to generate it from a string you chose, example:

$code->category_slug= \Str::slug($request->name . '-' .$request->category_id);

This will generate a slug from the name and id combined.

EDIT : If you want to get the current Product category slug you can use it like so:

$code->category_slug=$code->category->category_slug;

You might need to use $code->save() instead of update()