How do I use {{#IF}} in the Meteor to view information that only administrators can see in a secure environment?

Hi, everyone.I'm a beginner at Meteor.
After meter remove secure, I'm stuck with how to get {{#IF}} to recognize the results of the server decision.

[What I want to do]
Instead of using {{#each}} to subscribe to the cursor in the database,
I want to use {{#IF}} to show the appropriate text only to the person who logged in with the administrator's email address, but I don't know how to do it.

[Symptoms]
As for the code described below, the part where the server checks if it is an administrator is able to determine true/false.However, the results are not returned to the client side and are undefined.

調べてWhat I thought after researching 考えた
http://docs.meteor.com/#/full/meter_call
contains OnOn the client, if you do not pass a callback and you are not inside a stub, call will return undefined, .. とある, which exactly matches the symptom.So if I write in callback,
1. As it is asynchronous, if the timing of the decision is late, it may not be reflected in {{#IF}}?
2. I don't know how to return the result of true/false determined by the callback function to the original {{#IF}}.
There is a problem thatAt worst, I think I should save 2 in a global variable or database...

I think these cases are common, but do you know any smart way to do this?

[Code]

-client.html-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh-ooh!
  <template name="showToAdmin">
    {{#if showToAdminText}}
      appropriate text
    {{/if}}
  </template>
- client.js - client.js - client.js - client.js - client.js - client.js - client.js _yomi
  Template.showToAdmin.helpers({
    'showToAdminText': function() {
      return Meteor.call('showToAdminText');
    }
  });
- server.js - server.js - server.
  Meteor.methods({
    'showToAdminText': function() {
      varcurrentUserId = this.userId;
      if(currentUserId){
        varaddress =Meter.users.findOne(currentUserId).emails[0].address;
        return(address=='[email protected]');
      }
      return false;
    }
  });