fix bug parent_id and images

pages/categories/index.vue

@@ -139,6 +139,7 @@
                     prepend-icon="mdi-camera"
                   />
                 </v-col>
+                <v-img v-if="typeof eImage === 'string'" :src="eImage" />
               </v-row>
             </v-container>
             <small>*indicates required field</small>
@@ -248,7 +249,7 @@ export default {
   middleware: ['web'],
   data: () => {
     return {
-      parent_id: null,
+      parent_id: '',
       name: '',
       ordering: '',
       image: null,
@@ -385,14 +386,12 @@ export default {
         })
     },
     createCategory () {
-      const set = new Set([this.image])
-      const image = Array.from(set)
       const self = this
       const fd = new FormData()
       fd.append('name', this.name)
       fd.append('ordering', this.ordering)
       fd.append('parent_id', this.parent_id)
-      fd.append('images', image)
+      fd.append('images', this.image)
       this.$axios
         .post('/categories/',
           fd,
@@ -463,14 +462,16 @@ export default {
       console.log(item)
     },
     updateCategory (userID) {
-      const set = new Set([this.eImage])
-      const image = Array.from(set)
       const self = this
       const fd = new FormData()
+      if (this.eParentId === null) {
+        fd.append('parent_id', '')
+      } else {
+        fd.append('parent_id', this.eParentId)
+      }
       fd.append('name', this.eName)
       fd.append('ordering', this.eOrdering)
-      fd.append('parent_id', this.eParentId)
-      fd.append('images', image)
+      fd.append('images', this.eImage)
       try {
         this.$axios
           .post(`categories/update/${this?.eID}`,