Relationships between tables in laravel using backpack package - mysql

Question

I am using backpack CRUD package to create my website project in laravel 5.2
I want to establish a relationship between two tables. First table is called customer and second table is called transaction. Each customer has many transaction(1:N relationship).
Customer table record:
ID Name
123456 xyz
Transaction table record:
ID CustomerID
101010 123456
I know that I have to specify the relation in the customer model. But, how can I display the result of the relationship in CRUD ?

Answer 1

You should have relationships on both the Transaction and the Customer models, so you can do $customer->transactions and $transaction->customer:
class Customer extends Model
{
/**
* Get the comments for the blog post.
*/
public function transactions()
{
return $this->hasMany('App\Transactions', 'CustomerID', 'ID');
}
}
and
class Transaction extends Model
{
/**
* Get the comments for the blog post.
*/
public function customer()
{
return $this->belongsTo('App\Customer', 'CustomerID', 'ID');
}
}
Spend some time in the Eloquent Relationships Documentation. It's really important to understand them if you want to be a Laravel developer.
In order to display the relationship in the CRUD, you can then use Backpack's select column type to display it in the table view and select or select2 field types to display it in the add/edit views. Read the CRUD Example Entity to better understand how that works.

Answer 2

First of all when you are creating migrations for both tables, table which contain Foreign Key (FK) must have field like this:
public function up(){
$table->increments('id');
$table->integer('customerID')->unsigned();
}
After that you are need to call next command into console
php artisan migrate
Next is going next commands:
php arisan backpack:crud customers
php arisan backpack:crud transactions
After that you need to define functions in models which returns values from other tables. Customer models need to have next function
public function transactions(){
return $this->hasMany('Transaction');
}
Transaction model must have next function
public function customer() {
return $this->belongsTo('Customer');
}
Next you must add CRUD field in Customer controller to display
transactions in select box.
$this->crud->addField([
'label' => 'Transactions', // Label for HTML form field
'type' => 'select2', // HTML element which displaying transactions
'name' => 'customerID', // Table column which is FK for Customer table
'entity'=> 'customer', // Function (method) in Customer model which return transactions
'attribute' => 'ID', // Column which user see in select box
'model' => 'Transaction' // Model which contain FK
]);
Hope this helps :)

Answer 3

After you built onetomany relationship with transaction, you can get the results.
$customer=Customer::where(['id'=>'123456'])->with('transaction')
->first();
print_r($customer->Name); // gives the customer name
foreach($customer->transaction as $cid)
{
print_r($cid->CustomerID); // gives the customer id
}
Laravel Relationships Documentation is always helpful. Go through it.