how to insert one product to many categoies laravel attach() - php

Question

I have tried much time but failed.
Ex: I want result like if I insert a Product into the database and select multiple categories and store them different table then show me error like this:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'space.category_product' doesn't exist (SQL: insert into `category_product` (`category_id`, `product_id`) values (1, ))
If I rename database table From category_products To category_product manually the show me a new Error here below :
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'product_id' cannot be null (SQL: insert into `category_product` (`category_id`, `product_id`) values (1, ))
Here is my Database Code
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('model');
$table->string('slug')->unique();
$table->string('availability');
$table->float('price');
$table->longText('images');
$table->text('short_detail');
$table->text('feature');
$table->longText('purchase_delivery');
$table->longText('replace_policy');
$table->timestamps();
});
Schema::create('categories', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('slug');
$table->timestamps();
});
Schema::create('category_products', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id')->unsigned();
$table->foreign('product_id')->references('id')->on('products')->onUpdate('cascade')->onDelete('cascade');
$table->integer('category_id')->unsigned();
$table->foreign('category_id')->references('id')->on('categories')->onUpdate('cascade')->onDelete('cascade');
$table->timestamps();
});
Here is My Models:
class Category extends Model
{
public function Products()
{
return $this->belongsToMany(Product::class);
}
}
class Product extends Model
{
public function Categories()
{
return $this->belongsToMany(Category::class);
}
}
ProductController:
public function store(Request $request)
{
if ($request->hasFile('file')){
foreach ($request->file as $file) {
$fileExt = $file->getClientOriginalExtension();
$uniqId = uniqid('img-');
$fileName[] =$uniqId.'.'.$fileExt;
$Name = $uniqId.'.'.$fileExt;
$file->move('public/uploads',$Name);
}
$images = implode(",",$fileName);
$product = new Product();
$product->Categories()->attach($request->categories_id);
$product->name= $request->input('name');
$product->model= $request->input('model');
$product->slug= $request->input('slug');
$product->availability= $request->input('availability');
$product->price= $request->input('price');
$product->images= $images;
$product->short_detail= $request->input('short_detail');
$product->feature= $request->input('feature');
$product->purchase_delivery= $request->input('purchase_delivery');
$product->replace_policy= $request->input('replace_policy');
if ($product->save()) {
return redirect()->route('product.index')
->with('success', 'Product Added successfully');
}
return back()->withInput()->with('errors', 'Error Adding New Product');
}
}

Answer 1

Schema::create('category_product', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id')->unsigned();
$table->foreign('product_id')->references('id')->on('products')->onUpdate('cascade')->onDelete('cascade');
$table->integer('category_id')->unsigned();
$table->foreign('category_id')->references('id')->on('categories')->onUpdate('cascade')->onDelete('cascade');
$table->timestamps();
});
You have typo in the name it should be category_product.
Your table name should be alphabetically ordered and use singular names.
If you do not want to change the table names
public function Categories()
{
return $this->belongsToMany(Category::class, 'category_products,'category_id', 'product_id');
}
My ProductController :
public function store(Request $request)
{
if ($request->hasFile('file')){
foreach ($request->file as $file) {
$fileExt = $file->getClientOriginalExtension();
$uniqId = uniqid('img-');
$fileName[] =$uniqId.'.'.$fileExt;
$Name = $uniqId.'.'.$fileExt;
$file->move('public/uploads',$Name);
}
$images = implode(",",$fileName);
$product = new Product();
$product->name= $request->input('name');
$product->model= $request->input('model');
$product->slug= $request->input('slug');
$product->availability= $request->input('availability');
$product->price= $request->input('price');
$product->images= $images;
$product->short_detail= $request->input('short_detail');
$product->feature= $request->input('feature');
$product->purchase_delivery= $request->input('purchase_delivery');
$product->replace_policy= $request->input('replace_policy');
$product->save();
$product->Categories()->attach($request->categories_id);
if ($product->save()) {
return redirect()->route('product.index')
->with('success', 'Product Added successfully');
}
return back()->withInput()->with('errors', 'Error Adding New Product');
}
}
Use $product->categories()->attach($category_id) after the $product->save()

Answer 2

Here you can use your models
class Category extends Model
{
public function Products()
{
return $this->belongsToMany(Product::class, 'category_products');
}
}
class Product extends Model
{
public function Categories()
{
return $this->belongsToMany(Category::class, 'category_products);
}
}
Here category_products is a pivot table.
Now Save
$product = Product::create(['name' => 'product1']);
$product->Categories()->sync([1, 3, 4]);
OR
$product->Categories()->attach([1, 3, 4]);
Difference
Sync: You may also use the sync method to construct many-to-many associations. The sync method accepts an array of IDs to place on the
intermediate table. Any IDs that are not in the given array will be
removed from the intermediate table. So, after this operation is
complete, only the IDs in the given array will exist in the
intermediate table:
Attach: It is same like append, it append the new values with the existing one