Mutate in middleware, don't update reference.

packages/server/src/middleware/trimViewRowInfo.ts

@@ -23,12 +23,7 @@ export default async (ctx: Ctx<Row>, next: Next) => {
 
   // don't need to trim delete requests
   if (ctx?.method?.toLowerCase() !== "delete") {
-    const { _viewId, ...trimmedView } = await trimViewFields(
+    await trimViewFields(ctx.request.body, viewId, tableId)
-      viewId,
-      tableId,
-      body
-    )
-    ctx.request.body = trimmedView
   }
 
   ctx.params.sourceId = tableId
@@ -36,26 +31,29 @@ export default async (ctx: Ctx<Row>, next: Next) => {
   return next()
 }
 
+// have to mutate the koa context, can't return
 export async function trimViewFields<T extends Row>(
+  body: Row,
   viewId: string,
-  tableId: string,
+  tableId: string
-  data: T
+): Promise<void> {
-): Promise<T> {
   const view = await sdk.views.get(viewId)
   if (!view?.schema || !Object.keys(view.schema).length) {
-    return data
+    return
   }
 
   const table = await sdk.tables.getTable(tableId)
   const { schema } = sdk.views.enrichSchema(view!, table.schema)
-  const result: Record<string, any> = {}
+  const allowedKeys = [
-  for (const key of [
     ...Object.keys(schema),
     ...db.CONSTANT_EXTERNAL_ROW_COLS,
     ...db.CONSTANT_INTERNAL_ROW_COLS,
-  ]) {
+  ]
-    result[key] = data[key] !== null ? data[key] : undefined
+  // have to mutate the context, can't update reference
+  const toBeRemoved = Object.keys(body).filter(
+    key => !allowedKeys.includes(key)
+  )
+  for (let removeKey of toBeRemoved) {
+    delete body[removeKey]
   }
-
-  return result as T
 }

packages/server/src/sdk/app/views/index.ts

@@ -1,9 +1,4 @@
-import {
+import { RenameColumn, TableSchema, View, ViewV2 } from "@budibase/types"
-  RenameColumn,
-  TableSchema,
-  View,
-  ViewV2,
-} from "@budibase/types"
 import { context, HTTPError } from "@budibase/backend-core"
 import { cloneDeep } from "lodash"