How to define relationships between models in Phalcon?

@darrion.kuhn 

In Phalcon, relationships between models are defined using the belongsTo, hasMany, and hasOne methods of the PhalconMvcModel class.

Here's an example of how to define a belongsTo relationship between two models:

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class Order extends PhalconMvcModel
{
    public function initialize()
    {
        $this->belongsTo(
            "customer_id",
            "Customer",
            "id"
        );
    }
}

class Customer extends PhalconMvcModel
{
    public function initialize()
    {
        $this->hasMany(
            "id",
            "Order",
            "customer_id"
        );
    }
}

In this example, the Order model belongs to the Customer model, and the Customer model has many Order models. The belongsTo method is used to define the relationship in the Order model, and the hasMany method is used to define the relationship in the Customer model.

The belongsTo method takes three parameters:

1. The name of the foreign key column in the local table (customer_id in this case).
2. The name of the related model (Customer in this case).
3. The name of the primary key column in the related table (id in this case).

The hasMany method takes the same parameters, but in the opposite order.

You can also define a hasOne relationship, which is similar to belongsTo, but instead of the local model having a foreign key to the related model, the related model has a foreign key to the local model. To define a hasOne relationship, use the hasOne method instead of belongsTo.