similar to: How to check if a parent has children?

Suppose that I want to have a block of default content within a template that is replaced with the content of a specific partial only if that partial exists. Obviously there is the brute force approach of simply rendering the default content unless the relevant partial file exists in which case the relevant partial is rendered instead. I suspect that there may be a more elegant way to skin this

I have two PCs, one with Windows XP and another with Windows Vista. I''m working as an administrator in both computers. I''m using Ruby 1.8.7 and Rubygems 1.3.6. When I try to install Rails I get this error: C:\>gem install rails ERROR: While executing gem ... (Errno::ENOENT) No such file or directory - C:/Users/Jesús Dugarte I have installed Rails several times before

I have upgraded from 1.2.6 to 2.0.1 and successfully passed all my test and manual testing. Everything seems to be working correctly. My application is pretty vanilla and so there where few complications. Question is, should I do another point upgrade (and if so, which point to upgrade to next) or is it safe (and prudent) to just go straight on to the current version (2.3.x). Advise would be

Hi, I have a real simple association setup here that''s just trying to: - Create a new PayjunctionOrder - Create some LineItem objects and assign them to the PayjunctionOrder - Save everything I''m using Rails Edge. ---- class PayjunctionOrder < ActiveRecord::Base has_many :line_items end ------------------ ---- class LineItem < ActiveRecord::Base belongs_to :order,

Can anyone please advise me what is involved in up grading a project from version 1.2.6 to current (2.3.5). The project is pretty much vanilla code and does not use plugins. Are there scripts that can do the job (or pull out incompatibilities). Any websites or blogs that point the way or should I just bite the bullet and rewrite? Reason for wanting to upgrade is that I now do want to add features

Hi, I am a COBOL programmer and I am busy teaching myself Rails and Ruby. In COBOL I can code this conditional If x = 1 next sentence else .......................... The "next sentence" statement enables me to get out of the conditional. How would I code the same thing in Ruby? In C you could use break but I understand that Ruby has no break statement. Regards, Paul

Hello, I am implementing a classic invoice application. On the create new invoice page I want to allow users to add new line items using AJAX: ----------------------------------------------------------------------------- Invoice Date [ ] Client [ ] Line Items 1. [ ] $[ ] <add new line item> <save> <cancel>

Hi, I have a catalog that has images in it. The images are stored in public/images/.... When I open the catalog via the catalog controller I get this url: http://127.0.0.1:3000/images/sow/sow.jpg for the images and they display correctly. When I link to the catalog from another controller and view I get this: http://127.0.0.1:3000/catalog/images/sow/sow.jpg If I attempt to put and image

Hi, I have this in my form <%= check_box_tag(@accept, value = "1", checked = false) %> Which puts a nice checkbox on my form but when I try to retrieve the value that is returned, which I expect to find in @accept, there is nothing. How do I check the returned value? Thanks, Paul Thompson

I''ve read AWDR and especially the part concerning adding child line_items to an order. Unfortunately I want to do my process in reverse and in doing what I thought would work I get a null object error when trying to append the children to the parent. This is a _major_ stumbling block in my Rails use as almost every one of my projects has needed this so its a pretty vital problem I need

Hi, I would like to put a checkbox on a form where the input field is a variable rather than a field in a model. The normal way (with a model) would be: <%= check_box(''client'', ''accept'', {}, "1", "0") %> But since accept is a variable @accept and model client will not be there, how do I make a check box work? Regards, Paul

I''m having trouble with a validation that depends on an attribute of a belongs_to parent. If the child is added to an unsaved parent (parent.children << new child), the has_many collection parent.children includes the unsaved child. However the belongs_to attribute child.parent appears to be nil until the parent has been saved. Without access to the parent attributes, the validation

Hi, I am not sure if this is a general web question or a Rails specific one but either way, I would really appreciate help and guidance. My application generates quotes. To do so, you start at a page that has the client details. From there you go to a catalog (a link on the quote page) and select the items that are to be in the quote. All the above is working just fine. My problem is that when

Is it possible to create an action that would sent a view straight to a printer or a button of some sort that would enable the view to be printed. Currently the user has to click on file and then on print in the browser to print. My users would like to be able to click on a link or button and have the view printed. Is such a thing possible? And how would one do it? Thanks, Paul

Please can someone show me the correct syntax for a hidden field in forms, this is my code <%= start_form_tag :action => ''create'' %> <div class="form1"> <table width="auto" boader="8" cellspacing="5" cellpadding="5"> <% hidden_field ''line_item'', ''client_id'', :value

Hi, I have a problem with compiling the new revision, the file Sifsegv_gc makes a call to the file Sigsegv.cpp but returns as file already allocated: ... llvm [3]: Compiling for Debug + Asserts Sigsegv.cpp build (bytecode) llvm [3]: Compiling Sigsegv.ll to Sigsegv.bc for Debug + Asserts build ( bytecode) llvm [3]: Compiling Sigsegv.bc to Sigsegv.s for Debug + Asserts build llvm [3]: Compiling for

I was trying to write a wrapper for number_to_currency to return currency in pounds. I used a helper class to do this. def number_to_pounds(amt) number_to_currency(amt, :unit => "£") end This works fine, but I am trying to understand why I can''t use a symbol to pass the values. I thought symbols were like pointers. (you now know I am a newbie). def

I need some help please.. when I created web application about books market, i create a cart and using test the message error appear like this on rake test:functionals LineItemsControllerTest > test_should_create_line_item > ERROR > Cannot redirect to nil! and also appear on web side, thats error told that "Cannot redirect to nil!" Then i was checking the code,

Hi, I am a rails and ruby nuby :-) How do you pass data between different controllers and views? I have a page ( a quote) that I am editing url ....quote/edit/6 6 id the current id. I then go to a catalog (url....catalog) to add an item to my quote (I do this via a line_item file that the quote reads) I now want to go back to the quote. I have tried this <%= link_to ''Back to

Hi all i am following this like for basic paypal http://railscasts.com/episodes/141-paypal-basics and i got this error View: <%= link_to "Checkout", @cart.paypal_url() %> undefined method `paypal_url'' for nil:NilClass despite i have this code in my model called Card Cart Model: class Cart < ActiveRecord::Base def paypal_url(return_url) values = {