Update length validator, now it supports arrays

Author: isnifer

VueForm/validators/length.js

@@ -11,22 +11,31 @@ export default function length(options, customMessage = {}) {
   const { equals, min, max } = options
   invariant([equals, min, max].some(x => !isNil(x)), 'equals, min or max should be provided')
 
-  return (value, name) => {
+  return (rawValue, name) => {
+    const cleanValue = isNil(rawValue) ? '' : rawValue
+    const value = Array.isArray(cleanValue) ? cleanValue : String().trim()
+
     if (equals) {
-      return String(value).trim().length !== equals
-        ? customMessage.equals || `${startCase(name)} should have ${equals} characters`
+      return value.length !== equals
+        ? customMessage.equals ||
+            customMessage ||
+            `${startCase(name)} should have ${equals} characters`
         : undefined
     }
 
     if (min) {
-      return String(value).trim().length < min
-        ? customMessage.min || `${startCase(name)} should have at least ${min} characters`
+      return value.length < min
+        ? customMessage.min ||
+            customMessage ||
+            `${startCase(name)} should have at least ${min} characters`
         : undefined
     }
 
     if (max) {
-      return String(value).trim().length > max
-        ? customMessage.max || `${startCase(name)} may have maximum ${max} characters`
+      return value.length > max
+        ? customMessage.max ||
+            customMessage ||
+            `${startCase(name)} may have maximum ${max} characters`
         : undefined
     }