fix: coerce multipart initial property values to string

src/core/plugins/oas3/components/request-body.jsx

@@ -2,7 +2,7 @@ import React from "react"
 import PropTypes from "prop-types"
 import ImPropTypes from "react-immutable-proptypes"
 import { Map, OrderedMap, List } from "immutable"
-import { getCommonExtensions, getSampleSchema } from "core/utils"
+import { getCommonExtensions, getSampleSchema, stringify } from "core/utils"
 
 const RequestBody = ({
   requestBody,
@@ -83,15 +83,19 @@ const RequestBody = ({
 
               let initialValue = prop.get("default") || prop.get("example") || ""
 
-              if(initialValue === "" && type === "object") {
+              if (initialValue === "" && type === "object") {
                 initialValue = getSampleSchema(prop, false, {
                   includeWriteOnly: true
                 })
               }
 
+              if (typeof initialValue !== "string" && type === "object") {
+                initialValue = stringify(initialValue)
+              }
+
               const isFile = type === "string" && (format === "binary" || format === "base64")
 
-              return <tr key={key} className="parameters">
+              return <tr key={key} className="parameters" data-property-name={key}>
                 <td className="col parameters-col_name">
                         <div className={required ? "parameter__name required" : "parameter__name"}>
                           { key }

test/e2e-cypress/static/documents/bugs/5164.yaml

@@ -0,0 +1,23 @@
+openapi: "3.0.0"
+
+paths:
+  /:
+    post:
+      requestBody:
+        required: true
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                first:
+                  type: object
+                  example:
+                    one: abc
+                    two: 123
+                second:
+                  type: array
+                  items:
+                    type: string
+                  example:
+                  - "hi"

test/e2e-cypress/tests/bugs/5164.js

@@ -0,0 +1,19 @@
+describe("#5164: multipart property initial values", () => {
+  it("should provide correct initial values for objects and arrays", () => {
+    const correctObjectValue = JSON.stringify({
+      "one": "abc",
+      "two": 123
+    }, null, 2)
+
+    cy
+      .visit("?url=/documents/bugs/5164.yaml")
+      .get("#operations-default-post_")
+      .click()
+      .get(".try-out__btn")
+      .click()
+      .get(`.parameters[data-property-name="first"] textarea`)
+      .should("have.value", correctObjectValue)
+      .get(`.parameters[data-property-name="second"] input`)
+      .should("have.value", "hi")
+  })
+})