Merge pull request 'vuetify_set_unit_price_automatically_#37' (#38) from vuetify_set_unit_price_automatically_#37 into main

Reviewed-on: OneTeam/don_confiao#38

tienda_ilusion/don_confiao/frontend/don-confiao/src/components/Purchase.vue

@@ -45,6 +45,7 @@
               <v-select
                 v-model="line.product"
                 :items="products"
+                @update:modelValue="onProductChange(index)"
                 item-title="name"
                 item-value="id"
                 label="Producto"
@@ -58,7 +59,9 @@
                 label="Precio"
                 type="number"
                 :rules="[rules.required]"
+                prefix="$"
                 required
+                readonly
               ></v-text-field>
             </v-col>
             <v-col>
@@ -72,9 +75,12 @@
             </v-col>
             <v-col>
               <v-text-field
+                type="number"
                 :value="calculateSubtotal(line)"
                 label="Subtotal"
+                prefix="$"
                 readonly
+                disable
               ></v-text-field>
             </v-col>
             <v-col>
@@ -91,6 +97,7 @@
         <v-text-field
           :value="calculateTotal"
           label="Total"
+          prefix="$"
           readonly
         ></v-text-field>
         <v-btn @click="submit" color="green">Comprar</v-btn>
@@ -138,6 +145,11 @@
       },
     },
     methods: {
+      onProductChange(index) {
+        const selectedProductId = this.purchase.saleline_set[index].product;
+        const selectedProduct = this.products.find(p => p.id == selectedProductId);
+        this.purchase.saleline_set[index].unit_price = selectedProduct.price;
+      },
       fetchClients() {
         fetch('/don_confiao/api/customers/')
           .then(response => response.json())