ember find() keeps making api call even after I've stored it in DS.Store

I have a model with a custom adapter. I've got my adapter populating the application store but when my component calls find('model') it does another server request -- which I do not want. The docs said that if something's recorded in the store, then it will get it from cache.

SongAdapter = ApplicationAdapter.extent
    data = somePayload
    new Ember.RSVP.Promise (resolve, reject) =>
        path = 'some/endpoint/songs'
        myPOST(path, data, @, options).then (data) ->
             _.each data.songs, (entity) ->
                 entity.id = entity.songId
                 store.push('song', store.normalize('song', entity))
                 Ember.run(null, resolve, data)
            , (jqXHR) ->
                 jqXHR.then = null
                 Ember.run(null, reject, jqXHR)

When my component loads I fetch the initial songs like this:

getSongHistory: Ember.on 'didInsertElement', ->
     @store.find('song').then (data) =>
         @set('songHistory', data.get('content'))

I'm missing something. I thought that find() was supposed to search the cache first, then if empty delegate to the findAll() method in the adapter. What am I missing?