ru ember js help

async await.js

  async beforeModel() {
    const curUser = this.get('currentUser.user');
    const curCompany = curUser.get('currentCompany');

    const { current_conversation_id } = this.paramsFor('messages.index');

    const queryParams = {
      currentConversationId: current_conversation_id,
      companyId: curCompany.get('id')
    };

    if (current_conversation_id) {
      try {
        await this.store.queryRecord('conversation', queryParams)
      } catch(e) {
        if (e.code == 404) {
          return this.transitionTo(/* ... */)
        } else {
          throw e;
        }
      }
    }
  }

promise catch.js

  beforeModel() {
    const curUser = this.get('currentUser.user');
    const curCompany = curUser.get('currentCompany');

    const { current_conversation_id } = this.paramsFor('messages.index');

    const queryParams = {
      currentConversationId: current_conversation_id,
      companyId: curCompany.get('id')
    };

    if (current_conversation_id) {
      return this
        .store
        .queryRecord('conversation', queryParams)
        .catch((e) => {
          if (e.code == 404) {
            return this.transitionTo(/* ... */)
          } else {
            throw e;
          }
        });
    }
  }