Hey guys,
I’m on 1.4.0-beta.1+canary.189fdcbc. I’ve enabled the query-params feature and am using it to filter results from our API to display as markers on a Google map.
If I transition to a route with an array as one of the query params, the array is translated into a comma delimited string. I.e.
@transitionTo("route", queryParams: { foo: "bar", test: [1,2] }) # => http://domain.com/route?foo=bar&test=1%2C2
# as opposed to, say, /route?foo=bar&test[]=1&test[]=2
In order to make sure the comma delimited string is translated back into an array, I’m passing the queryParams into the controller as an Ember object:
setupController: (controller, context, queryParams) ->
queryParamsObject = Ember.Object.create(queryParams)
controller.set("queryParamsObject", queryParamsObject)
Then, I’m observing this query params object, parsing the comma-delimited string and setting a selection attribute on the controller:
# Simplified for clarity...
setupArrays: (->
Ember.run.once =>
queryParamsObject = @get("queryParamsObject")
test = queryParamsObject.get("test") # => "1,2"
testSelection = test.split(",") # => [1,2]
@set("testSelection", testSelection)
).observes("queryParamsObject")
This attribute populates the multiple select:
{{view Ember.Select selection=testSelection content=App.TestOptions multiple=true}}
On the flip side, I’m observing the selection attribute and updating the query params object when appropriate:
# Simplified for clarity...
updateTestQueryParam: (->
Ember.run.once =>
queryParamsObject = @get("queryParamsObject")
newCommaDelimitedValue = @get("testSelection").join(",")
queryParamsObject.set("test", newCommaDelimitedValue)
).observes("testSelection.@each")
I can then turn the query params object into a hash to pass to transitionTo. Whew.
So: this is all mostly working, but it feels like a TON of code. I’m wondering if there’s perhaps a more idiomatic way to do this without observers?
@machty I also know you’re actively working on improving the query-params implementation so let me know if this’ll be a moot point soon… I can handle some verbose code in the short term. 
That’s all I needed to hear. Looking forward to the new API. Ping me if you need some code review.