Trouble Accessing Ruby Array and Hash Value

Question

I am making an api call and receiving the following response (it's long, so I'm showing the important part):

... "fields":{"count"_1:["0"],"count_2":["5"]} ...

when I do:

call["fields"]["count_1"]

It returns

["0"]

I need it to give me just the integer. I tried:

call["fields"]["count_1"][0]

And I also tried:

call["fields"]["count_1"][0].to_i

I'm running this in Rails and it gives me the error:

undefined method `[]' for nil:NilClass

But it's not working.

Answer 1

使用String#to_i尝试以下操作

call["fields"]["count_1"][0].to_i # => 0

Answer 2

Some tips:

1. Try wrapping the API response in JSON.parse(...) . That is, if you're not making the call via a gem that already does this. This might require 'json' .

2. Try call['fields']['count_1'].first.to_i

3. Do some debugging: check the value of call.class , call['fields'].class and call['fields']['count_1'].class . The last one should definitly be an Array .

4. Add an if clause to check if call['fields'][['count_1'].is_empty? .

5. Look for typos :)

Answer 3

For some reason the API call was making the zeros nil instead of zero. Thanks for all your help.