From: Blake Miller <blakeage@...>
Date: 2006-12-02T06:33:10+09:00
Subject: Re: Simple iteration in a function problem

unknown wrote:
> Hi --
> 
> On Sat, 2 Dec 2006, Blake Miller wrote:
> 
>> def component(uniqueId) # note: uniqueId is a string
>>  @components.find { |comp| comp.getUniqueId == uniqueId }
>> end
>> end
>>
>> =========================================================
>> class SearchWidgetComponent
>> :attr_reader :uniqueId
> 
> No : on attr_reader; it's a method:
> 
>    attr_reader :uniqueID
> 
>> def getUniqueId
>>  @uniqueId
>> end
> 
> You've now got two "get" methods for @uniqueID: the one attr_reader
> created (which will be called uniqueID), and the one you've written.
> 
>> end
>>
>> =============================
>> class SearchWidgetComparisonComponent
>>
>> def getUniqueId
>>  super
> 
> super won't work here, unless this class is a subclass of
> SearchWidgetComponent.  And if it is a subclass, it will have that
> method anyway.  *And*... you don't need the method in the first place,
> because of attr_reader :-)
> 
>> end
>> end
> 
> Also, you need a way to set as well as get your uniqueID values,
> unless they're going to be something inherent in the object (the
> object's object_id).  Do you want attr_writer too?
> 
> 
> David
Noted, and changed.  Sorry if I'm dragging this out, I know I left out a 
couple details in the code I showed.  Indeed 
SearchWidgetComparisonComponent does, and has been extending 
SearchWidgetComponent.  My new code is like this:

class SearchWidget
 def initialize
  @components = Array.new
 end

 def add_component(component)
   @components << component   # these will always be subclass of 
SearchWidgetComponent
 end

 def printcomps  # i call this from index.rhtml, and it prints correctly 
the 2 *different* component ids
   str = ""
   @components.each_with_index do |comp, index|
     str += @components[index].uniqueId
   end
   str
 end

 def component(uniqueId)
  @components.find { |comp| comp.uniqueId == uniqueId }
 end
end

==================================
class SearchWidgetComponent
 attr_accessor :uniqueId

 def initialize(label, uniqueId) # see I pass a string as the id when I 
init
  @label = label
  @uniqueId = uniqueId
 end
end
==================================
class SearchWidgetComparisonComponent < SearchWidgetComponent
 def initialize(label, uniqueId)
  super(label, uniqueId)
  @dbFields = Array.new
  @showCalendar = false;
 end
end

in my index.rhtml, I have (please note I've added comments below only to 
this post, they are not in the source):
<%= @sw.printcomps %>  # prints "swCompareComp1", and "anoth" (my two 
unique ids)

# should return a SearchWidgetComparisonComponent
<% @obj = @sw.component("swCompareComp1") %>

# call method stylize() on the object
<%= @obj.stylize("sdbfPulldown", "scPulldown", "svfClass")%>


; however, the line that calls the stylize() method returns an error 
saying " NoMethodError in Region#index......You have a nil object when 
you didn't expect it! The error occured while evaluating nil.stylize"

Thanks ahead for the help yo.  I've been tearin my hair out for 5 hours 
now.

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