I'm passing as array of JSON object as a param in Rails through an AJAX post/delete, like
[{'id': 3, 'status': true}, {'id': 1, 'status': true}]
How do I loop through the params[:list] to get each id and status value?
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In params... it becomes ["0", {"id"=>"9", "status"=>"true"}]bcm– bcm2014-01-29 09:46:14 +00:00Commented Jan 29, 2014 at 9:46
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Error: can't convert Symbol into Integerbcm– bcm2014-01-29 09:51:07 +00:00Commented Jan 29, 2014 at 9:51
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4 Answers
Do this:
params[:list].each do |hash|
hash['id'] # => 3
hash['status'] # => true
end
2 Comments
Richard Peck
Wouldn't this loop through each item? I.E you don't need to loop through the
hash variable?
bcm
Thanks, this is correct, the answer I've posted has this and also deals with the issue why this couldn't work beforehand.
Try like follows:
params[ :list ][ 0 ][ :id ] # => 3, ...
params[ :list ].each {| v | v[ :id ] } # => 3, 1
In case if your hash is like ["0", {"id"=>"9", "status"=>"true"}]:
# a = ["0", {"id"=>"9", "status"=>"true"}]
h = Hash[[a]]
# => {"0"=>{"id"=>"9", "status"=>"true"}}
and access to it will be:
h['0'][ :id ] # => '9'
2 Comments
Малъ Скрылевъ
@bcm dump the
params[ :list ][ 0 ].inspectbcm
Thanks, I've posted the answer which deals with the root problem.
There were two steps to this, plus what @Agis suggested. (Thanks @Agis)
I had to first stringify the JSON:
'p': JSON.stringify(p),
So that it does not create that wierd array. There was another stackoverflow answer using this method to generate a correct data JSON object, but it was encapsulating the whole data... I need to have this on just p and not affect 'stringifying' the security token.
Understood this from here: Rails not decoding JSON from jQuery correctly (array becoming a hash with integer keys)
Next, I had to decode just that param, using
ActiveSupport::JSON.decode(params[:p])
a clue from here: How do I parse JSON with Ruby on Rails?
Lastly, can I then use the loop and access item['id']
Comments
Here's a loop:
params[:list].each do |item|
item.id
item.satus
end
If you want to create an array of id's or something:
list_ids = params[:list].map(&:id)