Capitalize only first character of string and leave others alone Rails

Question

I m trying to get Rails to capitalize the first character of a string  and leave all the others the way they are  I m running into a problem where  i m from New York  gets turned into  I m from new york     What method would I use to select the first character   Thanks   EDIT  I tried to implement what macek suggested  but I m getting a  undefined method  capitalize   error  The code works fine without the capitalize line  Thanks for the help   def fixlistname    self title   self title lstrip    title ends with                         self title 0    self title 0  capitalize   errors add to base  Title must start with   You know you        unless self title starts with   You know you  end   EDIT 2  Got it working  Thanks for the help   EDIT 3  Wait  no I didn t    Here s what I have in my list model   def fixlistname    self title   self title lstrip    title ends with                         self title slice 0 1  capitalize   self title slice 1  -1    errors add to base  Title must start with   You know you        unless self title starts with    You know you  end   EDIT 4  Tried macek s edit  and still getting an undefined method  capitalize   error  What could I be doing wrong   def fixlistname    self title   title lstrip   self title          unless title ends with           self title 0    title 0  capitalize   errors add to base  Title must start with  You know you       unless title starts with   You know you   end   EDIT 5  This is weird  I m able to get rid of the undefined method error by using the line below  The problem is that it seems to replace the first letter with a number  For example  instead of capitalizing the y in You  it turns the y into a 121   self title 0    title 0  to s capitalize

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str    this is a Test  str sub        amp  upcase      gt   This is a Test

User · Answer

If and only if OP would want to do monkey patching on String object  then this can be used  class String     Only capitalize first letter of a string   def capitalize first     self sub   S    amp  upcase    end end   Now use it    i live in New York  capitalize first    gt  I live in New York

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Edit 2  I can t seem to replicate your trouble  Go ahead and run this native Ruby script  It generates the exact output your looking for  and Rails supports all of these methods  What sort of inputs are you having trouble with      usr bin ruby def fixlistname title    title   title lstrip   title          unless title        3      title 0    title 0  capitalize   raise  Title must start with  You know you      unless title      You know you    title end  DATA each do  title    puts fixlistname title  end    END   you know you something WITH dots     you know you something WITHOUT the dots   you know you something with LEADING whitespace      you know you something with whitespace BUT NO DOTS this generates error because it doesn t start with you know you   output  You know you something WITH dots     You know you something WITHOUT the dots    You know you something with LEADING whitespace    You know you something with whitespace BUT NO DOTS    RuntimeError  Title must start with  You know you         Edit  Based on your edit  you can try something like this   def fixlistname    self title   title lstrip   self title          unless title ends with           self title 0    title 0  capitalize   errors add to base  Title must start with  You know you       unless title starts with   You know you   end     Original  This will do the trick  s    i m from New York  s 0    s 0  capitalize    gt  I m from New York     When trying to use String capitalize on the whole string  you were seeing I m from new york because the method      Returns a copy of str with the first character converted to uppercase and the remainder to lowercase     hello  capitalize       gt   Hello   HELLO  capitalize       gt   Hello   123ABC  capitalize      gt   123abc

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You can use humanize  If you don t need underscores or other capitals in your text lines   Input    i m from New York     humanize   Output    I m from new york

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Perhaps the easiest way   s    test string  s 0    s 0  upcase     gt   Test string

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Titleize will capitalise every word  This line feels hefty  but will guarantee that the only letter changed is the first one   new string   string slice 0 1  capitalize   string slice 1  -1    Update   irb main  001 0 gt  string    i m from New York       gt   i m from New York     irb main  002 0 gt  new string   string slice 0 1  capitalize   string slice 1  -1    gt   I m from New York

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string    i m from New York  string split   s    each   word i  word capitalize  unless i  gt  0   join          gt  I m from New York

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Note that if you need to deal with multi-byte characters  i e  if you have to internationalize your site  the s 0        solution won t be adequate   This Stack Overflow question suggests using the unicode-util gem  Ruby 1 9  how can I properly upcase  amp  downcase multibyte strings   EDIT  Actually an easier way to at least avoid strange string encodings is to just use String mb chars   s   s mb chars s 0    s first upcase s to s

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An object oriented solution   class String   def capitalize first char     self sub            1 capitalize     end end   Then you can just do this    i m from New York  capitalize first char

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No-one s mentioned gsub  which lets you do this concisely   string gsub     a-z        1 capitalize     Example     gt   caps lock must go  gsub            1 capitalize     gt   Caps lock must go

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This should do it   title    test test       title 0    title 0  capitalize puts title    Test test

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str sub       amp  capitalize

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Most of these answers edit the string in place  when you are just formatting for view output you may not want to be changing the underlying string so you can use tap after a dup to get an edited copy   test  dup tap    string  string 0    string 0  upcase

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An even shorter version could be   s    i m from New York     s 0    s capitalize 0

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my string    hello  World  my string sub   S    amp  upcase      gt   Hello  World

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As of Rails 5 0 0 beta4 you can use the new String upcase firstmethod or ActiveSupport  Inflector upcase first to do it  Check this blog post for more info

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Rails starting from version 5 2 3 has upcase first method  For example   quot my Test string quot  upcase first will return My Test string

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What about classify method on string     somESTRIng  classify   output    rails   gt   SomESTRIng

[ruby-on-rails] Capitalize only first character of string and leave others alone? (Rails)

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