如何从Laravel中的关系获取数据？

Question

I have a business model and subscriptions model. I load the data with the following:

Business::with('subscriptions')->get()

I then created a method on my Business class as follows:

public function check_for_subscription($type)
{
    if($this->subscriptions->isEmpty() === false)
    {
        foreach($this->subscriptions as $subscription)
        {
            dd($subscription);
            if($subscription->type == $type)
            {
                return true;
            }
        }
    }
    return false;
}

The dd shows me the following:

object(Subscription)#175 (17) {
  ["connection":protected]=>
  NULL
  ["table":protected]=>
  NULL
  ["primaryKey":protected]=>
  string(2) "id"
  ["perPage":protected]=>
  int(15)
  ["incrementing"]=>
  bool(true)
  ["timestamps"]=>
  bool(true)
  ["attributes":protected]=>
  array(7) {
    ["id"]=>
    int(1)
    ["business_id"]=>
    int(1)
    ["type"]=>
    string(3) "614"
    ["starts_at"]=>
    NULL
    ["ends_at"]=>
    NULL
    ["created_at"]=>
    string(19) "0000-00-00 00:00:00"
    ["updated_at"]=>
    string(19) "0000-00-00 00:00:00"
  }
  ["original":protected]=>
  array(7) {
    ["id"]=>
    int(1)
    ["business_id"]=>
    int(1)
    ["type"]=>
    string(3) "614"
    ["starts_at"]=>
    NULL
    ["ends_at"]=>
    NULL
    ["created_at"]=>
    string(19) "0000-00-00 00:00:00"
    ["updated_at"]=>
    string(19) "0000-00-00 00:00:00"
  }
  ["relations":protected]=>
  array(0) {
  }
  ["hidden":protected]=>
  array(0) {
  }
  ["visible":protected]=>
  array(0) {
  }
  ["fillable":protected]=>
  array(0) {
  }
  ["guarded":protected]=>
  array(1) {
    [0]=>
    string(1) "*"
  }
  ["touches":protected]=>
  array(0) {
  }
  ["with":protected]=>
  array(0) {
  }
  ["exists"]=>
  bool(true)
  ["softDelete":protected]=>
  bool(false)
}

If I try to do $subscription->type I get nothing. Any thoughts on how to get this working?

Here is the start of my business model

class Business extends Eloquent 
{
    public function subscriptions()
    {
        return $this->hasMany('Subscription');
    }
}

Here is my subscription model

class Subscription extends Eloquent 
{
    public function businesses()
    {
        return $this->belongsTo('Business');
    }
}

Answer 1

According to the dd() output the Subscription object has no attribute named "type". That explains why you get nothing from $subscription->type.

According to the dd() output again, the Subscription object do has a protected attribute named "attributes", which is an array. One of the keys of that array is "type" so I'll assume that is the value you are trying to reach.

As the "attributes" array is protected you can't access it from an external class. I assume your Subscription class has a getter function named getAttributes() which returns that protected array. If so... the only thing you need is something like:

public function check_for_subscription($type)
{
    if($this->subscriptions->isEmpty() === false)
    {
        foreach($this->subscriptions as $subscription)
        {
            $attributes = $this->subscriptions->getAttributes();
            if($attributes['type'] == $type)
            {
                return true;
            }
        }
    }
    return false;
}