fix: when the Field type is "file", value can not be updated (#2452)

* fix: when the Field type is file value can not be updated

* update code style

package.json

@@ -100,6 +100,7 @@
     "rifraf": "^2.0.3",
     "rimraf": "^2.5.4",
     "stringstream": "^0.0.5",
+    "tmp": "0.0.31",
     "webpack": "^1.14.0"
   },
   "peerDependencies": {

src/__tests__/createFieldProps.spec.js

@@ -5,6 +5,7 @@ import plainExpectations from '../structure/plain/expectations'
 import immutable from '../structure/immutable'
 import immutableExpectations from '../structure/immutable/expectations'
 import addExpectations from './addExpectations'
+import tmp from 'tmp'
 
 const describeCreateFieldProps = (name, structure, expect) => {
   const { empty, getIn, fromJS, toJS } = structure
@@ -334,6 +335,16 @@ const describeCreateFieldProps = (name, structure, expect) => {
         .toEqual(undefined)
     })
 
+    it('should update value to selected file for file inputs', () => {
+      let tmpFile = tmp.fileSync()
+      expect(createFieldProps({ getIn, toJS }, 'foo', {
+        value: [ tmpFile ],
+        state: empty,
+        type: 'file'
+      }).input.value)
+        .toEqual([ tmpFile ])
+    })
+
     it('should replace undefined value with empty string', () => {
       const result = createFieldProps({ getIn, toJS }, 'foo', {
         state: empty

src/createFieldProps.js

@@ -22,7 +22,7 @@ const processProps = (type, props, _value) => {
   if (type === 'file') {
     return {
       ...props,
-      value: undefined
+      value: value || undefined
     }
   }
   return props