Dependency problems with ember-source

[ninja-]

When using the newest ember-source, ember-rails is stuck with some kind of dependency problem:

gem 'ember-rails'
gem 'ember-source', '~> 1.10.0' # or the version you need

Bundler could not find compatible versions for gem "handlebars-source":
  In Gemfile:
    ember-rails (= 0.16.4) ruby depends on
      handlebars-source (< 3, > 1.0.0) ruby

    ember-rails (= 0.16.4) ruby depends on
      handlebars-source (3.0.0)

the reason I wanted to update in first place is the

template must be a function. Did you mean to call Ember.Handlebars.compile("...") or specify templateName instead?

error

[ninja-]

I could update after removing gemfile.lock.
The template error still holds, and the compiled template looks like this

Ember.TEMPLATES["login"] = Ember.Handlebars.template({"1":function(depth0,helpers,partials,data) {
  var stack1, buffer = '';
  data.buffer.push("  <h2>");
  stack1 = helpers._triageMustache.call(depth0, "title", {"name":"_triageMustache","hash":{},"hashTypes":{},"hashContexts":{},"types":["ID"],"contexts":[depth0],"data":data});
  if (stack1 != null) { data.buffer.push(stack1); }
  data.buffer.push("</h2>\n  ");
  stack1 = helpers._triageMustache.call(depth0, "text", {"name":"_triageMustache","hash":{},"hashTypes":{},"hashContexts":{},"types":["ID"],"contexts":[depth0],"data":data});
  if (stack1 != null) { data.buffer.push(stack1); }
  data.buffer.push("\n");
  return buffer;
},"compiler":[6,">= 2.0.0-beta.1"],"main":function(depth0,helpers,partials,data) {
  var stack1, buffer = '';
  data.buffer.push("<h1>Posts</h1>\n\n");
  stack1 = helpers.each.call(depth0, {"name":"each","hash":{},"hashTypes":{},"hashContexts":{},"fn":this.program(1, data),"inverse":this.noop,"types":[],"contexts":[],"data":data});
  if (stack1 != null) { data.buffer.push(stack1); }
  return buffer;
},"useData":true});

config.handlebar.ember_template is set to HTMLBars but changing it to Handlebars doesnt change anything

[ninja-]

The needed step after updating the ember-source gem was to clear cache & spring stop.
The template error is now gone.
I suggest changing README as ember-source 1.9 no longer works with latest version of ember-rails, which could be confusing for new users.

[IamNaN]

It looks like ember-rails gem no longer declares handlebars gem as a dependency. I was following the readme and handlebars isn't in the Gemfile.lock nor added to application.js. So I assume we have to add handlebars to our Gemfile, which is fine, as long as those two additional steps are added to the readme.

[IamNaN]

Actually, it appears we need to add the handlebars-source gem, not handlebars, and perhaps it should be version < 3.0. Further, it looks like handlebars-source 2.0 will not upgrade to 3.0 with bundle install unless you spec the version in your Gemfile. I wonder if those two facts didn't conspire to cause the problem you were seeing.

[tricknotes]

It seems this dependency problems is caused by bundler.

In addition, this template error is caused by sprockets' cache. If you use sprockets 3.0.0.beta10 or later, ember-source version is used in cache key.
So it is no longer problem.

[tricknotes]

It looks like ember-rails gem no longer declares handlebars gem as a dependency

Yes. But older ember-source depends on handlebars-source.
If handlebars-source is accessible from ember-rails, handlebars support will automatically be applied.