Fix default values when using multi-option column and supplying empty array.

packages/server/src/api/routes/tests/row.spec.ts

@@ -763,12 +763,25 @@ describe.each([
           expect(row.food).toEqual(["apple", "orange"])
         })
 
+        it("creates a new row with a default value when given an empty list", async () => {
+          const row = await config.api.row.save(table._id!, { food: [] })
+          expect(row.food).toEqual(["apple", "orange"])
+        })
+
         it("does not use default value if value specified", async () => {
           const row = await config.api.row.save(table._id!, {
             food: ["orange"],
           })
           expect(row.food).toEqual(["orange"])
         })
+
+        it("resets back to its default value when empty", async () => {
+          let row = await config.api.row.save(table._id!, {
+            food: ["orange"],
+          })
+          row = await config.api.row.save(table._id!, { ...row, food: [] })
+          expect(row.food).toEqual(["apple", "orange"])
+        })
       })
 
       describe("user column", () => {

packages/server/src/utilities/rowProcessor/index.ts

@@ -20,6 +20,7 @@ import {
   User,
   ViewV2,
   FeatureFlag,
+  Document,
 } from "@budibase/types"
 import { cloneDeep } from "lodash/fp"
 import {
@@ -134,7 +135,12 @@ async function processDefaultValues(table: Table, row: Row) {
   }
 
   for (const [key, schema] of Object.entries(table.schema)) {
-    if ("default" in schema && schema.default != null && row[key] == null) {
+    const isEmpty =
+      row[key] == null ||
+      row[key] === "" ||
+      (Array.isArray(row[key]) && row[key].length === 0)
+
+    if ("default" in schema && schema.default != null && isEmpty) {
       let processed: string | string[]
       if (Array.isArray(schema.default)) {
         processed = schema.default.map(val => processStringSync(val, ctx))