Rails - Add a method to a textfield - ruby-on-rails

Question

I'm trying to get the checkSwear method to run on each textfield before it's submitted..
I have basically this: (stripped down)
<%= form_for(#profile) do |f| %>
<div class="field">
<%= f.label 'I love to ' %>
<%= f.text_field :loveTo %>
</div>
<div class="field">
<%= f.label 'I hate to ' %>
<%= f.text_field :hateTo %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
In my controller I have:
def checkSwear
antiSwear.checkSwear(What goes here?)
end
In routes:
match '/check' => 'profiles#checkSwear'
Any help much appreciated!
(checkSwear is a separate gem; i.e. a separate problem! The what does here means what kind of variable is received from the form, to be put through the checkswear gem)
UPDATE:
Sorry for the camelcasing, I'm a Java developer studying Rails etc., old habits die hard. This is for a project. I'm supposed to be writing a small gem to do some ruby logic and apply it to something. The contents of the gem are:
module antiSwear
#swearwords = ["f**k", "f***ing", "shit", "shitting", "lecturer"]
#replacements = ["fornicate", "copulating", "poop", "pooping", "Jonathan"]
def self.checkText(text)
#swearwords.each do |swearword|
if text.include?(swearword)
index = #swearwords.index(swearword)
replacement = #replacements[index]
text.gsub(swearword, replacement)
end
end
return text
end
end
:/

Answer 1

This should really be done in model validations.
class Profile < ActiveRecord::Base
validate :deny_swearing
private
def deny_swearing
if AntiSwear.check_swear(love_to) || AntiSwear.check_swear(hate_to)
errors.add_to_base('Swearing is not allowed.')
end
end
end
That said, if you insist on this being in controller, you can check params[:profile][:love_to] and params[:profile][:hate_to] to see what's been submitted.
P.S. In this example I used proper ruby naming conventions, since we don't use "camelCasing".

Answer 2

Are you doing this as part of validation? You can do it one of a few ways. You can run the check before save, via a custom validation method or override the setter directly. I show you the custom validation approach here:
class Profile < ActiveRecord::Base
validate :clean_loveTo
protected
def clean_loveTo
errors.add(:loveTo, "can't contain swears") if antiSwear.checkSwear(loveTo)
end
end
I'm assuming checkSwear returns a boolean here.

Answer 3

I'd use an intersection on arrays, one of which is the source text split into words, then gsub the replacements in. You have to be sure to have a 1:1 relationship between the words and their replacements, in which case I'd suggest using a hash for your dictionary (coincidentally what hashes are sometimes called in other languages).
module antiSwear
# var names changed for formatting
#swears = ["f**k", "f***ing", "shit", "shitting", "lecturer"]
#cleans = ["fornicate", "copulating", "poop", "pooping", "Jonathan"]
def self.checkText(text)
# array intersection. "which elements do they have in common?"
bad = #swears & text.split # text.split = Array
# replace swear[n] with clean[n]
bad.each { |badword| text.gsub(/#{badword}/,#cleans[#swears.index(badword)] }
end
end
You might need to futz with text.split arguments if the replacement gets hung up on \n & \r stuff.