migration with temporary simple schema

26_remove_profile_email.js

Migrations.add({
  version : 26,
  name : 'Remove profile.email from users',
  up : function(){
    //  add optional profile.email so we can remove it
    var profile = _.extend({
        email : {
        type : String,
        optional: true
      }
    }, Schemas.UserProfile._schema);

    var user = Schemas.User._schema;
    var profileSchema = new SimpleSchema(profile);

    user.profile = {type: profileSchema, optional: true};

    var userSchema = new SimpleSchema(user);
    Meteor.users.attachSchema(userSchema, {replace: true});

    Meteor.users.find({"profile.email": {$exists: true}}).forEach(function(u){
      Meteor.users.update({_id: u._id}, {$unset: {"profile.email": ""}});
    });

    // reset the schema back to the original
    Meteor.users.attachSchema(Schemas.User, {replace: true});

  }
});