feat: sample-gen mulit and form media-type (#6874)

* application/x-www-form-urlencoded || **multipart/** initial value should rely on sample gen

src/core/json-schema-components.jsx

@@ -129,8 +129,9 @@ export class JsonSchema_array extends PureComponent {
   }
 
   componentWillReceiveProps(props) {
-    if(props.value !== this.state.value)
-      this.setState({ value: props.value })
+    const value = valueOrEmptyList(props.value)
+    if(value !== this.state.value)
+      this.setState({ value })
 
     if(props.schema !== this.state.schema)
       this.setState({ schema: props.schema })
@@ -382,5 +383,5 @@ export class JsonSchema_object extends PureComponent {
 }
 
 function valueOrEmptyList(value) {
-  return List.isList(value) ? value : List()
+  return List.isList(value) ? value : Array.isArray(value) ? fromJS(value) : List()
 }

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

@@ -143,22 +143,23 @@ const RequestBody = ({
               const description = prop.get("description")
               const currentValue = requestBodyValue.getIn([key, "value"])
               const currentErrors = requestBodyValue.getIn([key, "errors"]) || requestBodyErrors
-
-              let initialValue = prop.get("default") || prop.get("example") || ""
-
-              if (initialValue === "") {
-                if(type === "object") {
+              const included = requestBodyInclusionSetting.get(key) || false
+              let hasNonEmptyInitialVal = prop.has("default") || prop.has("example") || prop.hasIn(["items", "example"]) || prop.hasIn(["items", "default"]) || prop.has("enum") && prop.get("enum").size === 1
+              let initialValue = ""
+              if(type === "array" && !hasNonEmptyInitialVal) {
+                initialValue = []
+              } else if (hasNonEmptyInitialVal) {
+                // TODO: what about example or examples from requestBody could be passed as exampleOverride
                 initialValue = getSampleSchema(prop, false, {
                   includeWriteOnly: true
                 })
-                } else if(type === "array") {
-                  initialValue = []
               }
-              }
-
               if (typeof initialValue !== "string" && type === "object") {
                initialValue = stringify(initialValue)
               }
+              if (typeof initialValue === "string" && type === "array") {
+                initialValue = JSON.parse(initialValue)
+              }
 
               const isFile = type === "string" && (format === "binary" || format === "base64")
 
@@ -196,7 +197,7 @@ const RequestBody = ({
                   {required ? null : (
                     <ParameterIncludeEmpty
                       onChange={(value) => onChangeIncludeEmpty(key, value)}
-                              isIncluded={requestBodyInclusionSetting.get(key) || false}
+                      isIncluded={included}
                       isIncludedOptions={setIsIncludedOptions(key)}
                       isDisabled={Array.isArray(currentValue) ? currentValue.length !== 0 : !isEmptyValue(currentValue)}
                     />