CRUD Modulo requisiciones LGP y actualización modulos de aprobaciones

backend/src/modules/lpg/lpg.service.ts

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+import lpgModel from "./lpg.model";
+import { ILpg } from "./lpg.interface";
+import { idText } from "typescript";
+
+export class LPGService{
+
+
+    //Crear solicitud gas LPG
+    async create (
+        data:ILpg
+    ){
+
+        data.totalAmount = data.gallons *
+        data.pricePerGallon;
+
+        const lpg = new lpgModel(data);
+
+        return await lpg.save();
+    }
+
+    //Obtener todas las requisiciones
+    async getAll() {
+
+        return await lpgModel
+        .find()
+        .populate("requestedBy")
+        .populate("approveBy")
+    }
+
+    //Obtener requisición por Id
+    async getById(
+        id:string
+    ){
+        return await lpgModel
+        .findById(id)
+        .populate("requestedBy")
+        .populate("approveBy")
+    }
+
+    async update(
+        id:string,
+        data:Partial<ILpg>
+    ){
+        if (data.gallons &&
+            data.pricePerGallon
+        ){
+            data.totalAmount =
+            data.gallons * 
+            data.pricePerGallon
+        }
+
+        return await lpgModel
+        .findByIdAndUpdate(
+            id,
+            data,
+            {
+                new:true
+            }
+        );
+    }
+
+
+    async getByStatus(
+        status:string
+    ){
+        return await lpgModel
+        .find({
+            status
+        } as any)
+    }
+
+    async getByPlant(
+        plant:string
+    ){
+        return await lpgModel
+        .find({
+            plant
+        }as any)
+    }
+
+    async delete(
+        id:string
+    ){
+        return await lpgModel
+        .findByIdAndDelete(id);
+    }
+}