Use only the first character of the string and leave others alone? (Rails)

Question

I am trying to get Rails to use the first character of the string and leave everyone else as they are. I run into a problem when "I'm from New York" turns into "I'm from New York."

What method would I use to select the first character?

thank

EDIT: I tried to implement what the matzek suggested, but I get an error "

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:. He works. Thanks for the help!

EDIT 3: Wait, no, I didn’t ... This is 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: Fixed editing macek and still getting the `w91>` capize 'error. What can i do 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 strange. I can get rid of an undefined method error using the line below. The problem is that it seems to replace the first letter with a number. For example, instead of smoothing y into You, it turns y into 121

 self.title[0] = title[0].to_s.capitalize 

Answer 1

Titleize will use every word. This line feels great, but guarantees that the only letter is changed - this is the first.

 new_string = string.slice(0,1).capitalize + string.slice(1..-1) 

Update:

 irb(main):001:0> string = "i'm from New York..." => "i'm from New York..." irb(main):002:0> new_string = string.slice(0,1).capitalize + string.slice(1..-1) => "I'm from New York..." 

Answer 2

This should do it:

 title = "test test" title[0] = title[0].capitalize puts title # "Test test" 

Answer 3

You can use humanization. Unless you need underscores or other capitals in text strings.

Input:

 "i'm from New_York...".humanize 

Output:

 "I'm from new york..." 

Answer 4

 str = "this is a Test" str.sub(/^./, &:upcase) # => "This is a Test" 

Answer 5

As Rails 5.0.0.beta4, you can use the new String#upcase_first or ActiveSupport::Inflector#upcase_first for this. See the blog post for more details.

Answer 6

Object Oriented Solution:

 class String def capitalize_first_char self.sub(/^(.)/) { $1.capitalize } end end 

Then you can simply do this:

 "i'm from New York".capitalize_first_char 

Answer 7

 str.sub(/./, &:capitalize) 

Answer 8

Edit 2

I can not repeat your problem. Go ahead and run this native Ruby script. It generates the exact result you are looking for, and Rails supports all of these methods. What resources do you encounter?

 #!/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 

Exit

 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 editing, 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

It will do the trick

 s = "i'm from New York" s[0] = s[0].capitalize #=> I'm from New York 

---

When you try to use String#capitalize for the entire string, you see I'm from new york , because the method:

Returns a copy of str with the first character converted to uppercase, and the rest to lowercase.

 "hello".capitalize #=> "Hello" "HELLO".capitalize #=> "Hello" "123ABC".capitalize #=> "123abc" 

Answer 9

 my_string = "hello, World" my_string.sub(/\S/, &:upcase) # => "Hello, World" 

Answer 10

Most of these answers edit the line in place, when you just format the output for presentation, you may not want to change the base line so you can use tap after dup to get the edited copy

 'test'.dup.tap { |string| string[0] = string[0].upcase } 

Answer 11

If and only if the OP wants to execute a monkey patch on a String object, then this can be used

 class String # Only capitalize first letter of a string def capitalize_first self.sub(/\S/, &:upcase) end end 

Now use it:

 "i live in New York".capitalize_first #=> I live in New York 

Answer 12

No one mentions gsub which allows you to do this briefly.

 string.gsub(/^([az])/) { $1.capitalize } 

Example:

  > 'caps lock must go'.gsub(/^(.)/) { $1.capitalize } => "Caps lock must go" 

Answer 13

An even shorter version could be:

 s = "i'm from New York..." s[0] = s.capitalize[0] 

Answer 14

Note that if you need to deal with multibyte characters, i.e. If you want to internationalize your site, the solution s[0] =... will not be suitable. This question suggests using the unicode-util gem

Ruby 1.9: how to correctly register and iterate over multibyte strings?

EDIT

Actually an easier way to at least avoid weird string encoding is to simply use String # mb_chars :

 s = s.mb_chars s[0] = s.first.upcase s.to_s 

Answer 15

Perhaps the easiest way.

 s = "test string" s[0] = s[0].upcase # => "Test string" 

Answer 16

How about classifying a method in a string?

 'somESTRIng'.classify 

exit:

 #rails => 'SomESTRIng' 

Answer 17

 string = "i'm from New York" string.split(/\s+/).each{ |word,i| word.capitalize! unless i > 0 }.join(' ') # => I'm from New York