For a Laravel application I'm working on, I would like to do something like this with my Eloquent models:
$product = Product::with('terms')->find(1);
$brand = $product->terms('brand');
$color = $product->terms('color');
The terms is a many to many relationship. Terms in this context, is terms of taxonomies. So a products terms could be: Nike, Red, Boys, etc.
And if I do $product->terms I get all terms, and when I do $product->terms('brand') I get 'Nike' for instance.
Right now my Product model is like this:
class Product extends Eloquent {
protected $guarded = array();
public static $rules = array();
public function terms($taxonomy)
{
return $this->belongsToMany('Term', 'productterms');
}
}
Is it even possible to do what I'm trying to achieve?
Why not just use a one-to-many relationship? Have a table of colours and a table of brands and then products can have belong to a colour and brand.
If you must have many-to-many (such that a product can have multiple brands or colours) then you can have a table for colours and brands again and then use joining tables for the relationship.
This is all described in the Laravel 4 documentation.
Related
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?
this is my situation:
I have a collection of products and i want all the categories of those products.
Between Product and Category there is a many-to-many relation already created, and i want to do something like this:
$prods = Product::where(something)->get();
$categories = $prods->categories();
But obviously this doesn't work, and i would avoid getting all categories for each products, and add it to a collection only if is not alredy in it... something like this:
select *
from categories join pivot on categories.id = pivot.id
where pivot.product_id IN (1,2,3,4,5)
where 1,2,3,4,5 are the ids of the products
Is there any way to do it without QueryBuilder (using Eloquent)?
You should define a many-to-many relationship in your Product model
public function categories()
{
return $this->belongsToMany(Category::class);
}
And then you can do this
$ids = [1,2,3,4,5];
$prods = Product::with('categories')->findOrFail($ids);
$categories = $prods->flatMap->categories;
The with call eager loads your categories, and then you retrieve them easily + flatten (to avoid multi-dimensional collection) thanks to flatMap method.
I have 2 queries that needed to join 1st is eloquent and 2nd is query builder,
1st Query
$products = Product::all();
2nd Query
$inventory = DB::table('product_warehouse')
->where('product_id', $product_id)
->where('warehouse_id', $warehouse_id)
->first();
How to merge this 2 queries into elouquent way ?
From your usage of the query builder it seems like you have an intermediate table to store which product to which warehouse exist, but if it is a one to many relationship you should not have that table, instead in your products table you should have a warehouse_id which will reference the id on the warehouses table, as you said the relationship is one to many, not many to many.
So in your Warehouse model you can add:
public function products()
{
return $this->hasMany(Product::class);
}
And in your Product model:
public function warehouse()
{
return $this->belongsTo(Warehouse::class);
}
Based on your table name, you might need to set the $table in your warehouse model to match that:
protected $table = 'product_warehouse';
Then you have many ways to fetch it, one of which is :
Warehouse::find($warehouse_id)->products;
// or
Warehouse::with('products')->where('id', $warehouse_id)->get();
// to get the warehouse to which the product belongs to
Product::find($product_id)->warehouse;
I've just started using Eloquent ORM (Without Laravel) and I am having issues with the many to many relationships.
I have a table where I store Families (Article categories), another one for the Articles, and a third one as a "pivot". I want to be able to get all the articles a Family has, and all the families an article belongs to. So I have coded this models.
Families
class Families extends Model {
public $table = 'Families';
public function Articles() {
return $this->belongsToMany('Articles', 'articles_families', 'families_id', 'articles_id');
}
}
Articles
class Articles extends Model {
public $table = 'Articles';
public function Families() {
return $this->belongsToMany('Families', null, 'articles_id', 'families_id');
}
}
Then I am trying to retrieve the data like this:
$families = Families::all();
echo $families[1]->Articles;
However, it just returns an empty array, when it should return a couple of articles. I have tripled checked that all the values are correct in the three tables. If I echo the Eloquent query debugger I can see that it is looking for a null value and I'm pretty sure that's the problem, but I don't quite know how to fix it. Here:
{"query":"select * from `Families`","bindings":[],"time":49.13},{"query":"select `Articles`.*, `articles_families`.`families_id` as `pivot_families_id`, `articles_families`.`articles_id` as `pivot_articles_id` from `Articles` inner join `articles_families` on `Articles`.`id` = `articles_families`.`articles_id` where `articles_families`.`families_id` is null","bindings":[],"time":38.93}
The null value is at the end of the last query.
I just found the solution myself. As my primary key columns are called Id, and Eloquent by default assumes the primary key is called id, I needed to override that by adding a class property protected $primaryKey = "Id"; and it now retrieves the data properly.
I've got the following tables:
products (
id
)
attributes (
id
name
value
)
products_attributes (
product_id,
attribute_id
)
And I need to be able to query for all of the attributes of a specific product. I tried doing this with the FLUENT QUERY BUILDER but I'm getting lost in my own code.
Can someone help me out with an example?
Usually you would create models for both of your entities, in which you can specify the relationships:
class Product extends Eloquent
{
protected $table = 'products';
public function attributes()
{
return $this->belongsToMany('Attribute', 'products_attributes');
}
}
class Attribute extends Eloquent
{
protected $table = 'attributes';
public function products()
{
return $this->belongsToMany('Product', 'products_attributes');
}
}
The belongsToMany() method sets up a many-to-many relationship. The first parameter specifies the related model class name, the second one the name of the database table that holds the connections between the two entities.
To find a product with ID 1234, you would fetch it like this:
$product = Product::find(1234);
You can then magically access all of its attributes like this:
$attributes = $product->attributes;
For more information, you can refer to the documentation.