I am new to laravel & want to implement eloquent relationship.
Let me explain.
Consider I have 2 tables
products
product_id
product_name
brand_id
price
brands
id
brand_name
Each product will have one brand Id.But in Brands table, there is no product id. One brand_id can be in multiple product rows, and one product has one brand_id only. I want to select some col from products table plus brand_name with respect to brand_id of products table using Model.SO in Product model I wrote:
public function brands()
{
return $this->hasOne('App\Brand','product_id');
}
and in Brand model I write:
public function products()
{
return $this->belongsTo('App\Product','brand_id');
}
Now I want the result:
product_name
price
brand_name
How can I fetch those data in controller using eloquent relation? Also, the way I wrote Model relationship, Is it ok??
Your Product Model relation will be below
public function brand(){
return $this->belongsTo('App\Brand','brand_id');
}
public function product(){
return $this->belongsTo('App\Product','product_id');
}
Now in controller you can add query as below.
$products = Product::with('brand','product')->get();
echo '<pre>'
print_r($products->toArray());
exit;
It looks to me like you want a one-to-many relationship, so one brand can have many products and many products belong to one brand.
Product model:
public function brand()
{
return $this->belongsTo('App\Brand');
}
Brand model:
public function products()
{
return $this->hasMany('App\Product');
}
Then you would be able to get the brand information like this:
The full brand model:
Product::first()->brand
The brand name:
Product::first()->brand->brand_name
From the docs:
A one-to-many relationship is used to define relationships where a
single model owns any amount of other models. For example, a blog post
may have an infinite number of comments.
P.S.:
Your table column names do not make much sense to me, why do you have product_id on products but then on brands it is just called id? Why do you have product_name but then just price? why is it not just name or product_price, so your at least consistent?
Related
i have an invoice model that i want it to have 'n' products in it so in my invoice model i place a relation hasMany like below
public function products(){
return $this->hasMany('App\Product','id','product_id');
}
so in database of invoice i create 5 fields for products and a quantitiy for each of products
$table->increments('id');
$table->text('title');
$table->longText('description');
$table->integer('client_id');
$table->integer('product_id1');
$table->integer('product_quantity1');
$table->integer('product_id2')->nullable();
$table->integer('product_quantity2')->nullable();
$table->integer('product_id3')->nullable();
$table->integer('product_quantity3')->nullable();
$table->integer('product_id4')->nullable();
$table->integer('product_quantity4')->nullable();
$table->integer('product_id5')->nullable();
$table->integer('product_quantity5')->nullable();
i want to know is it the right way to do this or i should make a table contain the id of product and the id of invoice to combine them with each other ??? and if i have to make a new table how should i set the relations ?
thanks
This looks similar to Many To Many approach between invoice and products. Add a junction table (invoice_products) which connects invoice and products, table should have invoice_id, product_id , Also have pivot attribute for quantity for each product like
For many to many you can add definitions in your models like
class Invoice extends Model
{
public function products()
{
return $this->belongsToMany(Product::class, 'invoice_products', 'invoice_id')
->withPivot('quantity')
->as('invoice_products_pivot');
}
}
class Product extends Model
{
public function invoices()
{
return $this->belongsToMany(Invoice::class, 'invoice_products', 'product_id');
}
}
I have the following models
Category
id // we don't want to use this one for the relation
category_id // we want to use this
Product
id
CategoryProduct
product_id // points to "id" on products table
category_id // points to **category_id** on categories table
I have the Product model set up as follows (only the most recent variation).
class Product {
public function categories() {
return $this->belongsToMany('Category', 'categories_products', 'category_id');
}
}
When I try to get a product with categories as follows...
Product::with('categories')->get();
I either get the wrong categories because the query is using id on categories as the foreign key. I need it to be using category_id on the categories table.
Or I get none at all. I can't seem to hash out how to set up which columns to use on the belongsToMany method.
Try this follow,
class Product {
public function categories() {
return $this->belongsToMany('Category', 'categories_products', 'product_id','category_id');
}
}
I have two models:
class Order extends Eloquent
{
public function User()
{
return $this->belongsTo('User');
}
public function Product()
{
return $this->belongsToMany('Product');
}
}
and the second one is:
class Product extends Eloquent
{
public function Order()
{
return $this->belongsToMany('Order');
}
}
My question is how can i access a value of second table column using pivot table:
product table:
id
title
image
order table:
id
status
pivot table(order_product):
id
product_id
order_id
I need to access title column of products from orders. for example if a user orders many products in one order I can fetch all product title and show theme.
I don't like use join , instead I like to use Laravel functionality itself.
I found the answer:
$orders = Order::orderBy('created_at', 'DESC')->paginate($page_number);
foreach($orders as $item){
foreach($item->product as $item){
{{$item->title}}<br>
}
}
I can access products from order.
Please any help me that how i pull all the fields from both tables in laravel many to many relationship.
I have two table
categories
id
cname
ctitle
description
products
id
pname
ptitle
pdescription
price
and bridge table
products_to_categories
id
category_id
product_id
So i have pull all the fields from both tables based on product id.
UPD: As commented patricus, the "bridge" table should be called "category_product"
First, you should define the "belongsToMany" relationship in the Product model:
// ...
class Product extends Eloquent {
// ...
function categories()
{
return $this->belongsToMany('Category');
}
}
After it you should load the product by id:
$product = Product::find($product_id);
And now you can access its categories through the "categories" property:
foreach($product->categories as $category)
{
// do what you want with the $category
}
Official docs for M2M relationships:
http://laravel.com/docs/4.2/eloquent#many-to-many
I am trying to use Eloquent to get a specific product that has a brand_id column that maps to a brands table, the brand array is coming back empty.
Is there anything obvious here that needs to be changed?
$product = Product::with('images')->with('brand')->select($fields)->where('display', '=', 1)->find($id);
//Product model
class Product extends Eloquent {
...
public function brand()
{
return $this->belongsTo('Brand');
}
//Brand model
class Brand extends Eloquent {
...
public function products()
{
return $this->hasMany('Product');
}
You have this:
$product = Product::with('images', 'brand')
->select($fields)
->where('display', 1)
->find($id);
You are getting null for brand and it could be because you have some specific fields and most probably you didn't select the foreing_key from the products table that creates the relationship with Brand, so if your products table contains the foreign_key (probably brand_id) of brand table then you have to select that foreign_key from the products table too. So, just add that foreign_key/brand_id in the $fields variable. Without the relation builder key (FK) the Brand won't be loaded.