Using BubbleWrap to read JSON files - json

Question

I have a backend to an IOS application. I am trying to read the data from my rails backend by using JSON. My bubbleWrap get request is as follows.
BW::HTTP.get("url_here/children/1.json") do |response|
json = BW::JSON.parse response.body.to_str
for line in json
p line[:name]
end
end
It doesn't bring any data back, it actually breaks my code. I can't find any documentation with an example of how to use REST from rubymotion/Bubblewrap and pull data back to my application.
Any help is appreciated.

Answer 1

Here's a handy class abstraction that I use in a lot of my applications... it completely abstracts the API call logic from the view controller logic for separation of concerns and is heavily modeled after Matt Green's Inspect 2013 talk.
class MyAPI
APIURL = "http://your.api.com/whatever.json?date="
def self.dataForDate(date, &block)
BW::HTTP.get(APIURL + date) do |response|
json = nil
error = nil
if response.ok?
json = BW::JSON.parse(response.body.to_str)
else
error = response.error_message
end
block.call json, error
end
end
end
Then to call this class we do:
MyAPI.dataForDate(dateString) do |json, error|
if error.nil?
if json.count > 0
json.each do |cd|
# Whatever with the data
end
else
App.alert("No Results.")
end
else
App.alert("There was an error downloading data from the server. Please check your internet connection or try again later.")
end
end

Answer 2

Always check the response code before parsing the response body. You might
BW::HTTP.get(url) do |response|
if response.ok?
data = BW::JSON.parse(response.body.to_str)
# make sure you have an array or hash before you try iterating over it
data.each {|item| p item}
else
warn "Trouble"
end
end
Also make sure you sanity-check the JSON response vs your code's expectation. Perhaps the JSON is an array and not a hash?