TypeError no implicit conversion of Symbol into Integer

Question

I encounter a strange problem when trying to alter values from a Hash  I have the following setup   myHash       company name  MyCompany      street  Mainstreet      postcode  1234      city  MyCity      free seats  3     def cleanup string   string titleize end  def format   output   Hash new   myHash each do  item      item  company name    cleanup item  company name       item  street    cleanup item  street       output  lt  lt  item   end end   When I execute this code I get   TypeError  no implicit conversion of Symbol into Integer  although the output of item  company name  is the expected string  What am I doing wrong

User · Answer

Ive come across this many times in my work  an easy work around that I found is to ask if the array element is a Hash by class   if i class    Hash      notation like i  label  will work in this block and not throw that error  end

User · Answer

This error shows up when you are treating an array or string as a Hash  In this line myHash each do  item  you are assigning item to a two-element array  key  value   so item  symbol  throws an error

User · Answer

You probably meant this   require  active support core ext    for titleize  myHash    company name  MyCompany   street  Mainstreet   postcode  1234   city  MyCity   free seats  3    def cleanup string   string titleize end  def format hash    output        output  company name    cleanup hash  company name     output  street    cleanup hash  street     output end  format myHash      gt    company name  gt  My Company    street  gt  Mainstreet     Please read documentation on Hash each

User · Answer

myHash each  item     is returning you array object for item iterative variable like the following  --    company name   MyCompany     street   Mainstreet     postcode   1234     city   MyCity     free seats   3     You should do this --  def format   output   Hash new   myHash each do  k  v      output k    cleanup v    end   output end

User · Answer

Your item variable holds Array instance  in  hash key  hash value  format   so it doesn t expect Symbol in    method    This is how you could do it using Hash each   def format hash    output   Hash new   hash each do  key  value      output key    cleanup value    end   output end   or  without this   def format hash    output   hash dup   output  company name    cleanup output  company name     output  street    cleanup output  street     output end

[ruby-on-rails] TypeError: no implicit conversion of Symbol into Integer

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