entry.js

App.Entry = DS.Model.extend({
  title: DS.attr("string"),
  content: DS.attr("string")
});

new.hbs

<form {{action "createEntry" on="submit" }}>
  {{input type="text" placeholder="Title ...." value=newTitle}}
  <br>
  {{textarea placeholder="Content" value=newContent}}
  <br>
  {{input type="submit" value="Create"}}
  <hr>
</form>

new_controller.js

App.NewController = Ember.ArrayController.extend({
  actions: {
    createEntry: function() {
      var title = this.get("newTitle"),
          content = this.get("newContent");

      var entry = this.store.createRecord('entry', {
        title: title,
        content: content
      });

      entry.save();

      this.set("newTitle", "");
      this.set("newContent", "");

      this.transitionToRoute("entries");
    }
  }
});