Soft delete and house keeping endpoint (#184)

prisma/middlewares/softDeleteMiddleware.ts

@@ -0,0 +1,48 @@
+import { Prisma, PrismaClient } from "@prisma/client";
+
+export const softDeleteMiddleware = (
+  prisma: PrismaClient,
+  model: Prisma.ModelName,
+) => {
+  prisma.$use(async (params, next) => {
+    // We use middleware to handle soft deletes
+    // See: https://www.prisma.io/docs/concepts/components/prisma-client/middleware/soft-delete-middleware
+    if (params.model === model) {
+      if (params.action === "delete") {
+        // Delete queries
+        // Change action to an update
+        params.action = "update";
+        params.args["data"] = { deleted: true };
+      }
+      if (params.action == "deleteMany") {
+        // Delete many queries
+        params.action = "updateMany";
+        if (params.args.data != undefined) {
+          params.args.data["deleted"] = true;
+        } else {
+          params.args["data"] = { deleted: true };
+        }
+      }
+      if (params.action === "findUnique" || params.action === "findFirst") {
+        // Change to findFirst - you cannot filter
+        // by anything except ID / unique with findUnique
+        params.action = "findFirst";
+        // Add 'deleted' filter
+        // ID filter maintained
+        params.args.where["deleted"] = false;
+      }
+      if (params.action === "findMany") {
+        // Find many queries
+        if (params.args.where) {
+          if (params.args.where.deleted == undefined) {
+            // Exclude deleted records if they have not been explicitly requested
+            params.args.where["deleted"] = false;
+          }
+        } else {
+          params.args["where"] = { deleted: false };
+        }
+      }
+    }
+    return next(params);
+  });
+};