Fix condition

app/Models/Currency.php

@@ -12,56 +12,4 @@ class Currency extends Model
     protected $guarded = [
         'id'
     ];
-
-    public function customers()
-    {
-        return $this->hasMany(Customer::class);
-    }
-
-    public function items()
-    {
-        return $this->hasMany(Item::class);
-    }
-
-    public function invoices()
-    {
-        return $this->hasMany(Invoice::class);
-    }
-
-    public function estimates()
-    {
-        return $this->hasMany(Estimate::class);
-    }
-
-    public function expenses()
-    {
-        return $this->hasMany(Expense::class);
-    }
-
-    public function payments()
-    {
-        return $this->hasMany(Payment::class);
-    }
-
-    public function recurringInvoices()
-    {
-        return $this->hasMany(RecurringInvoice::class);
-    }
-
-    public function checkTransactions()
-    {
-        if (
-            $this->customers()->exists() ||
-            $this->items()->exists() ||
-            $this->invoices()->exists() ||
-            $this->estimates()->exists() ||
-            $this->expenses()->exists() ||
-            $this->payments()->exists() ||
-            $this->recurringInvoices()->exists()
-        ) {
-            return true;
-        }
-
-        return false;
-    }
 }