Endpoint to check company currency transaction

app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyTransactionController.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Crater\Http\Controllers\V1\Admin\Settings;
+
+use Crater\Http\Controllers\Controller;
+use Crater\Models\Company;
+use Crater\Models\CompanySetting;
+use Crater\Models\Currency;
+use Illuminate\Http\Request;
+
+class CompanyCurrencyTransactionController extends Controller
+{
+    /**
+     * Handle the incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function __invoke(Request $request)
+    {
+        $this->authorize('manage company', Company::find($request->header('company')));
+
+        $companyCurrency = CompanySetting::getSetting('currency', $request->header('company'));
+
+        $currency = Currency::find((int)$companyCurrency);
+
+        if (
+            $currency->customers()->exists() ||
+            $currency->items()->exists() ||
+            $currency->invoices()->exists() ||
+            $currency->estimates()->exists() ||
+            $currency->expenses()->exists() ||
+            $currency->payments()->exists() ||
+            $currency->recurringInvoices()->exists()
+        ) {
+            return response()->json([
+                'success' => false,
+            ]);
+        }
+
+        return response()->json([
+            'success' => true,
+        ]);
+    }
+}

app/Models/Currency.php

@@ -12,4 +12,39 @@ 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);
+    }
 }