I am working on Ruby on Rails. I have a hash like below
{"attachment"=>"{:output_dir=>\"/home/mypath/\", :process_hash=>\"8b9d9c51\", :type=>\"pdf\", :processed_dir=>\"/513/9a1/88a\", :pdf=>\"/system/path/a3ae1194f76d737b6cfb141fa0fde17f78f2e94e.pdf\", :slides_count=>4, :meta=>{:swfs=>\"{/system/path/88a/8b9d9c51[*,0].swf,4}\", :pngs=>\"/system/path/8b9d9c51{page}.png\", :json=>\"/system/path/8b9d9c51.js\"}}"
In my code i have
JSON.parse(params[:attachment])
which throws me an error as
JSON::ParserError (757: unexpected token at '{:output_dir=>"/home/path", :process_hash=>"8b9d9c51", :type=>"pdf", :processed_dir=>"/513/9a1/88a", :pdf=>"/system/path/a3ae1194f76d737b6cfb141fa0fde17f78f2e94e.pdf", :slides_count=>4, :meta=>{:swfs=>"{/system/path/8b9d9c51[*,0].swf,4}", :pngs=>"/system/path/8b9d9c51{page}.png", :json=>"/system/path/8b9d9c51.js"}}'):
Suggest me how to resolve this.
JSON.parse parses an JSON formatted String into a Hash, not the other way around. I'm not sure what you'd like to accomplish?
If you're trying to convert a Hash into JSON (string) you could use
params[:attachment].to_json
If you're trying to convert a JSON (string) into Hash you could use
JSON.parse(params[:attachment])
However, your string doesn't look like JSON (it includes => where it should have :)
Valid JSON looks like:
{ "attachment": { "output_dir": "/home/mypath", "process_hash": "89r2432" } }
Related
I'm trying to save null value in JSON into postgresql. When I use the following code:
resume = Resume.create!({
parsedres: {"Resume":{"xml:lang":"en","xmlns":"http://ns.hrxml.org/2006-02-28","xmlns:vos":"http://noresm.com/hr-xml/2006-02-28","ResumeId":{"IdValue":null}}}
})
I get an error:
NameError: undefined local variable or method `null' for main:Object
The issue is I get API data without "" for null and when I use JSON.parse
resume.parsedres = JSON.parse(response.body)
resume.save
It throws the
JSON::ParserError: 765: unexpected token at '<ParseResumeResponse xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Code>Ack</Code><SubCode>Authentication/SubCode><Message>AccountID.</Message><CreditsRemaining>100</CreditsRemaining></ParseResumeResponse>'
Why does JSON.parse not interpret null?
In the first example you provided, the parsedres is not JSON but a Ruby Hash literal. Since the literal is Ruby code, you'd need to use Ruby's nil keyword instead of null:
resume = Resume.create!({
parsedres: {"Resume":{"xml:lang":"en","xmlns":"http://ns.hrxml.org/2006-02-28","xmlns:vos":"http://noresm.com/hr-xml/2006-02-28","ResumeId":{"IdValue":nil}}}
})
If you received a JSON string from the API, you should be able to parse it using the code you listed above:
require 'json'
resume = Resume.create!({
parsedres: JSON.parse('{"Resume":{"xml:lang":"en","xmlns":"http://ns.hrxml.org/2006-02-28","xmlns:vos":"http://noresm.com/hr-xml/2006-02-28","ResumeId":{"IdValue":null}}}')
})
Based on the exception being thrown, it looks like the response.body is XML data, not JSON.
In controller side i am getting params like
"{\"violation_date\":\"sdfsdf\",\"violation_time\":\"\"},{\"violation_date\":\"sdfdsf\",\"violation_time\":\"sdfsdf\"},{\"violation_date\":\"1233\",\"violation_
time\":\"\"},{\"violation_date\":\"test\",\"violation_time\":\"time\"}"
class of this is String. I am trying to parse this. Through
JSON.parse(params_gotton)
Got
JSON::ParserError (757: unexpected token at ',{"violation_date":"sdfdsf","violation_time":"sdfsdf"},{"violation_date":"1233","violation_time":""},{"violation_d
te":"test","violation_time":"time"}'):
What i am doing wrong here. Any suggestions?
It's not valid json, this will work (use []):
require 'json'
jsn = '[{"violation_date":"sdfsdf","violation_time":""},
{"violation_date":"sdfdsf","violation_time":"sdfsdf"},
{"violation_date":"1233","violation_time":""},
{"violation_date":"test","violation_time":"time"}]'
JSON.parse(jsn) # => [{"violation_date"=>"sdfsdf", "violation_time"=>""}, {"violation_date"=>"sdfdsf", "violation_time"=>"sdfsdf"}, {"violation_date"=>"1233", "violation_time"=>""}, {"violation_date"=>"test", "violation_time"=>"time"}]
To verify json string you could use: http://www.jslint.com/.
And basic json structure: http://json.org/
UPDATED
In your case just try this:
JSON.parse('[' + params_gotton + ']')
well, received string does not contain a proper Json structure..
First convert that received param in a proper json structure and then parse it using "JSON.parse(params_gotton)".
In above received data all key and value shud be in a key value pair string format.. remove "\" symbol from received data..
it will definitely work fine..
I am trying to parse the JSON response from Wordnik's API. This is built with Sinatra. I keep getting the error "TypeError at /word" "can't convert Hash into String". Am I using the json parser incorrectly?
Here's my code:
get '/word' do
resp = Wordnik.words.get_random_word(:hasDictionaryDef => 'true', :maxCorpusCount => 20, :minLength => 10)
result = JSON.parse(resp)
word = result.word
return word.to_s
end
You are probably getting a hash. To convert it use to_json:
JSON.parse(resp.to_json)
You have not given what's the JSON response that you are parsing. But assuming it is something of the form
{
"word":"my_word"
}
you need to do result["word"] to get the value after parsing the JSON response.
I’m trying to parse some JSON from the twitter API and extract the value of a key (“media_url”), which is a sub-key of the key (“entities”)
so far I have:
url = 'https://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&screen_name=print_broadcast&count=1'
response = RestClient.get(url)
data=response.body
result = JSON.parse(data)
How would I extract a key value from the parsed JSON?
I’ve tried
result[“entities”]
etc, but I get en error when trying to convert a string to integer... the result of my parsed JSON is an array - shouldn't this be a hash?
Sorry for the dumb questions.
Any help would be appreciated.
The JSON output is actually a list. Granted, it only has one element, but it's still a list.
First get result[0], then you can access ['entries'].
I want to parse Rails production.log files and recreate the params Hash. I am stuck with the Marshal.load method, which actually expects the data to be marshalled. Well, the data is well-formed but it is a String and not in a Marshal expected format.
here is the String that i regexed out of the request from the logfile:
{
"location"=>{"city"=>"München \"foo \" bar", "id"=>"462", "youtube_tags"=>""},
"authenticity_token"=>"UHi0GCNDBPN/Ms+0bqEOl4HGvUjDRw8tNvtqVl3v0dY=",
"utf8"=>"\342\234\223", "textinput"=>""
}
I tried my way around this issue with
o=JSON.parse.gsub("=>",":"))
in which case i get problems with umlauts.
Is there no way to parse or load a Hash representation from a String to actual Ruby Hash structures with Ruby 1.8.7?
This probably isn't the best way to do it, but ...
h = eval '{
"location"=>{"city"=>"München", "id"=>"462", "youtube_tags"=>""},
"authenticity_token"=>"UHi0GCNDBPN/Ms+0bqEOl4HGvUjDRw8tNvtqVl3v0dY=",
"utf8"=>"\342\234\223", "textinput"=>""
}'