Foreign Key In MySQL using Yii

Question

I have the database just like this

==== Invoices ====
id
costumer_id
description

==== Costumers ===
id
firstname
lastname

Now I have made the relation in between models just like this.In Invoices models the relation is as like this

 public function relations()
  {
    return array(
    'customer' => array(self::BELONGS_TO, 'Customer', 'customer_id')
    );
  }

In costumer model the relation is just like this

  public function relations()
  {
    return array(
      'invoice' => array(self::HAS_MANY, 'Invoices','customer_id')
    );
  }

Now as my relation is defined one costumer has many invoices and the invoice is belongs to the costumer. Now I made multimodel and loaded the Costumer model into Invoice model just like this.

  public function actionCreate()
  {
    $model = new Invoices;
    $customers = new Customers;
    // Uncomment the following line if AJAX validation is needed
    // $this->performAjaxValidation($model);

    if (isset($_POST['Invoices'],$_POST['Customers']))
    {
      $model->attributes = $_POST['Invoices'];
      $customers->attributes = $_POST['Customers'];
      $valid = $model->validate();
      $valid = $customers->validate();
      if($valid)
      {
        $model->save(false);
        $customers->id = $model->customer_id;
        $customers->save(false);
        $this->redirect(array('view','id'=>$model->id));
      }
    }

    $this->render('create',array(
      'model'=>$model,
      'customers'=>$customers,
    ));
  }

Here every thing is okay. I can insert the data for both models easily. But my problem comes here in the way that when I am inserting data from Invoice multimodel the foreign key id is not changing. It is showing zero everytime. Can some one tell me where I am wrong.Any help and suggestions will be highly appriciable.

Answer 1

My guess is that you are overriding the customer's primary key with the invoice's foreign key. I do not say that's not correct that way (maybe in your scenario it makes sense).

Let me explain what you are doing in that code:

• First, you create new instances of two models, Invoices and Customers. Yii understands that as "they wish to insert new items in the database".

• Then, you check if there are the items coming from an ajax form. If true, then,

• You populate Invoices (defined as $model . I'd change it to $invoice , in case you need to edit and understand it further).
• You also popupulate the customer's information, overriding the $valid value (so, you don't know if invoice is actually valid).
• If valid (remember you're only validating customer's information), do,
• Save the invoice
• Override customer's id with invoice's foreing key to customer.
• Save the customer, and redirect.

Now, what I got from that:

• $valid doesn't work as expected: I'd change that to an incremental assignment.
• You may not be passing a customer_id coming from the ajax form. Foreing keys are integers, and so if not defined within a model, it becomes 0 or NULL .
• You are always passing id = 0 / NULL to Customer's model, so it would probably warn you when validating. However, you are using save(false) , which means it doesn't pre-validate on save, so you never know it doesn't work.

So, according to this:

  public function actionCreate()
  {
    $invoice = new Invoices;
    $customers = new Customers;
    // Uncomment the following line if AJAX validation is needed
    // $this->performAjaxValidation($invoice);

    if (isset($_POST['Invoices'],$_POST['Customers']))
    {
      $invoice->attributes = $_POST['Invoices'];
      $customers->attributes = $_POST['Customers'];
      $valid = true; /* expect it is always valid */
      $valid &= $invoice->validate(); /* if $invoice is not valid, $valid will be false (true&false = false) */
      $valid &= $customers->validate(); /* same as the above line */
      if($valid)
      {
        $customers->save(); /* First save customers. It's the Foreign item */
        $invoice->customer_id = $customers->getPrimaryKey(); /* new instances use getPrimaryKey() to get its id */
        $invoice->save(); /* Save invoice AFTER getting customer's primary key */
        $this->redirect(array('view','id'=>$invoice->id));
      }
    }

    $this->render('create',array(
      'invoice'=>$invoice,
      'customers'=>$customers,
    ));
  }

I hope this solves your problem.

Answer 2

Please you need to understand a clear scenerio here. why would you use if($valid) { $model->save(false); $customers->id = $model->customer_id; $customers->save(false); $this->redirect(array('view','id'=>$model->id)); }

$model->save(false); tells model that if this record is not save(), the it shoud set the $customers->id = $model->customer_id;

This will only return false because. I do rather prefer if you call ( $customers->id = $model->customer_id;) before the $model->save();

REMEMBER, if you need to check if Save() returns true, then set it to $model->save(true)