refactor parent categories selector controller code

app/javascript/controllers/parent_categories_selector_controller.js

@@ -8,8 +8,7 @@ export default class extends Controller {
     check(event){
         const input = event.currentTarget.querySelector('input')
         const allInputs = this.chipsTarget.querySelectorAll('input')
-        const children = this.#categories_with_parents()
-        const parents = this.#categories_with_children(children)
+        const parents = this.#categories_with_children()
 
         if(this.#id_to_acronym(input.value) in parents){
             const parentChildren = parents[this.#id_to_acronym(input.value)]
@@ -27,28 +26,22 @@ export default class extends Controller {
         }
     }
 
-    #categories_with_parents() {
-        const children = {};
+    #categories_with_children(){        
+        const parentToChildren = {};
         this.categoriesValue.forEach(category => {
-            if (category.parentCategory.length > 0) {
-                const parentsAcronyms = category.parentCategory.map(p => p.split('/').pop());
-                children[category.acronym] = parentsAcronyms;
-            }
-        });
-        return children;
-    }
+        if (category.parentCategory) {
+            category.parentCategory.forEach(parentId => {
+            const parentAcronym = this.#id_to_acronym(parentId);
+            const childAcronym = this.#id_to_acronym(category.id);
 
-    #categories_with_children(children){
-        const parents = {};
-        Object.keys(children).forEach(child => {
-            children[child].forEach(parent => {
-                if (!parents[parent]) {
-                    parents[parent] = [];
-                }
-                parents[parent].push(child);
+            if (!parentToChildren[parentAcronym]) {
+                parentToChildren[parentAcronym] = [];
+            }
+            parentToChildren[parentAcronym].push(childAcronym);
             });
+        }
         });
-        return parents
+        return parentToChildren
     }
 
     #id_to_acronym(id){