Cache relations to avoid duplicate queries

packages/core/src/Base/BaseModel.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Eloquent\Model;
 use Lunar\Base\Traits\HasModelExtending;
+use Spatie\LaravelBlink\BlinkFacade as Blink;
 
 abstract class BaseModel extends Model
 {
@@ -22,4 +23,11 @@ public function __construct(array $attributes = [])
             $this->setConnection($connection);
         }
     }
+
+    protected function getCachedRelation($attribute, $callback, $morphType = '')
+    {
+        return Blink::once('lunar:'.$attribute.$morphType.':'.$this->{$attribute}, function() use ($callback) {
+            return $callback();    
+        });
+    }
 }

packages/core/src/Models/Cart.php

@@ -189,6 +189,13 @@ public function currency()
     {
         return $this->belongsTo(Currency::class);
     }
+
+    public function getCurrencyAttribute()
+    {
+        return $this->getCachedRelation('currency_id', function () {
+            return $this->currency()->first();    
+        });
+    }
 
     /**
      * Return the user relationship.
@@ -199,6 +206,13 @@ public function user()
     {
         return $this->belongsTo(config('auth.providers.users.model'));
     }
+
+    public function getUserAttribute()
+    {
+        return $this->getCachedRelation('user_id', function () {
+            return $this->user()->first();    
+        });
+    }
 
     public function scopeUnmerged($query)
     {

packages/core/src/Models/CartLine.php

@@ -119,6 +119,13 @@ public function cart()
     {
         return $this->belongsTo(Cart::class);
     }
+
+    public function getCartAttribute()
+    {
+        return $this->getCachedRelation('cart_id', function () {
+            return $this->cart()->first();    
+        });
+    }
 
     /**
      * Return the tax class relationship.
@@ -154,4 +161,11 @@ public function purchasable()
     {
         return $this->morphTo();
     }
+
+    public function getPurchasableAttribute()
+    {
+        return $this->getCachedRelation('purchasable_id', function () {
+            return $this->purchasable()->first();    
+        }, 'purchasable_type');
+    }
 }

packages/core/src/Models/Price.php

@@ -55,6 +55,13 @@ public function priceable()
     {
         return $this->morphTo();
     }
+
+    public function getPriceableAttribute()
+    {
+        return $this->getCachedRelation('priceable_id', function () {
+            return $this->priceable()->first();    
+        }, 'priceable_type');
+    }
 
     /**
      * Return the currency relationship.
@@ -65,6 +72,13 @@ public function currency()
     {
         return $this->belongsTo(Currency::class);
     }
+
+    public function getCurrencyAttribute()
+    {
+        return $this->getCachedRelation('currency_id', function () {
+            return $this->currency()->first();    
+        });
+    }
 
     /**
      * Return the customer group relationship.
@@ -75,4 +89,11 @@ public function customerGroup()
     {
         return $this->belongsTo(CustomerGroup::class);
     }
+
+    public function getCustomerGroupAttribute()
+    {
+        return $this->getCachedRelation('customer_group_id', function () {
+            return $this->customerGroup()->first();    
+        });
+    }
 }

packages/core/src/Models/ProductVariant.php

@@ -85,6 +85,13 @@ public function product()
     {
         return $this->belongsTo(Product::class)->withTrashed();
     }
+
+    public function getProductAttribute()
+    {
+        return $this->getCachedRelation('product_id', function () {
+            return $this->product()->first();    
+        });
+    }
 
     /**
      * Return the tax class relationship.
@@ -95,6 +102,13 @@ public function taxClass()
     {
         return $this->belongsTo(TaxClass::class);
     }
+
+    public function getTaxClassAttribute()
+    {
+        return $this->getCachedRelation('tax_class_id', function () {
+            return $this->taxClass()->first();    
+        });
+    }
 
     /**
      * Return the related product option values.