`[]': can't convert String into Integer (TypeError)

Question

I have an array:

sheets # => [{"id"=>3, "subject"=>"www", "body"=>"www", "target_groups"=>"www", 0=>3, 1=>"www", 2=>"www", 3=>"www"}]

I am trying to call a certain element inside this array. I tried the following:

puts sheets[2] # => nil
puts sheets["subject"] # =>  `[]': can't convert String into Integer (TypeError)
puts sheets["subject.to_i"] # => `[]': can't convert String into Integer (TypeError) also.

Help would be appreciated.

falsetru · Accepted Answer · 2015-01-03 04:19:10Z

4

The hash object is inside an array.

You need to fetch the hash object first (sheets[0]), then you can use key to fetch the item you want:

sheets = [{"id"=>3, "subject"=>"www", "body"=>"www",
          "target_groups"=>"www", 0=>3, 1=>"www", 2=>"www", 3=>"www"}]
sheets[0]["subject"]
# => "www"

answered Jan 3, 2015 at 4:19

falsetru

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6 Comments

khan Over a year ago

@falsetru generally in hashes the key/values doesn't store in memory in the sequence we specified,so if we specify sheets[0] then it will written id

falsetru Over a year ago

@khan, sheets is not a hash, but an array of hashes: sheets = [...]

khan Over a year ago

k so in that case sheets[1]["subject"]should return www and can u let me know how to access the multiple hashes i mean sheets[0][''] sheets[1][""]

falsetru Over a year ago

@khan, Do you want something like this? sheets.map { |sheet| sheet['subject'] }

khan Over a year ago

@falsetru Here is my data [{"Item_No"=>"7", "Update_Date"=>Wed Jun 03 "User _ID"=>"SAM-5555", "CREATE_DATE"=>Tue May 26 , "ID"=>"5555", " CRT_USER_ID"=>"SAM-5555"}] hash in an array,as u said earlier I tried item [0]["Item_No"] which returns "7" and also i wanted the value of next hash so I did item[2]["ID"] I got the following error "undefined method `[]' for nil:NilClass", what I am actually trying to do is to capture the retrieved data in single variable and assert it with the test data or any other suggestion regarding it will be usefull. Thanks

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