Category: Errors

The Name is Either Already Used or Reserved by Ruby on Rails

Hey everyone,

I ran into the following error while attempting to create a new model called calendar today:

chris@chris-VirtualBox:~/calendar$ rails g model calendar
      invoke  active_record
      The name 'Calendar' is either already used in your application or reserved by Ruby on Rails. Please choose an alternative and run this generator again.

It turns out that this was due to the fact that my application was also called Calendar. In order to get around this I decided to rename the application. This required a little bit of searching and thanks to this Stackoverflow post I found references in the following files:

– config/application.rb
– config/environment.rb
– config/environments/development.rb
– config/environments/production.rb
– config/environments/test.rb
– config/initializers/secret_token.rb
– config/initializers/session_store.rb
– config/mongoid.yml (if using Mongoid)
– config/routes.rb
– config.ru
– Rakefile
– app/views/layouts/application.html.erb, in title tag
– initializers/secret_token.rb
– initializers/session_store.rb

Let me know if you find any more spots that I’ve missed!

Fields Missing from jQuery Post – Serialize Data

Hey everyone,

I was using jquery’s serialize method to post completed form data only to find that a number of my fields were missing.


                //Display loader and disable forms
		disable_form_fields(true);

                //Post via ajax
		$.ajax({
			type: 'POST',
			url: 'uploads/add',
			data: $(form).serialize(),
			success: function(data, text_status, oHTTP){
				handle_form_response(data, text_status, oHTTP, $(form).data('file_id'))
			},
			error: function(){

				//Hide loader etc
				set_form_loading(false);

				//Unspecified error
				alert('An error has occurred.');
			},
			dataType: 'json'			
		});

Thanks to this stackoverflow post I realised that the data wasn’t being serialised because I’d disabled most of the fields beforehand. This was done in order to prevent the user from changing the values. To get around this I simply had to serialise the data BEFORE disabling anything. 


                //Post via ajax
		$.ajax({
			type: 'POST',
			url: 'uploads/add',
			data: $(form).serialize(),
			success: function(data, text_status, oHTTP){
				handle_form_response(data, text_status, oHTTP, $(form).data('file_id'))
			},
			error: function(){

				//Hide loader etc
				set_form_loading(false);

				//Unspecified error
				alert('An error has occurred.');
			},
			dataType: 'json'			
		});

               //Display loader and disable forms - DO THIS AFTER SERIALISING
		disable_form_fields(true);

Let me know if you have any issues.

jQuery DateTimePicker with Bootstrap

Hey everyone,

I ran into a bit of trouble today trying to get datetimepicker to work within bootstrap tabs. The dialog appeared however none of the buttons seemed to work. The fields also remained unpopulated.

It turned out the the issue was caused by the fact that I’d used jquery’s clone function to duplicate the tabs without reassigning field ids. This meant that there were multiple fields with the same id, confusing datetimepicker.

The solution I used was to dynamically assign all of the ids as each tab was displayed:


/* Bind tab change events: this has been done so that there is less js overhead */
function bind_tab_change_events(){

	//Bind change event
	$('.nav-tabs').bind('show', function(e){

		//Create vars
		var selected_file_id = $(e.target).data('file_id');

		//Initialisations
		initialise_time_pickers('#file_' + selected_file_id + ' .timepicker', selected_file_id);	
	})
}

/* Initalise timepickers */
function initialise_time_pickers(selector, unique_id){

	//Loop through each bound element
	$.each($(selector), function(index, value){

		//Set id - datepicker won't work without unique ids
		$(value).attr('id', $(value).attr('id') + '_' + unique_id);

		//Initialise datepicker		
		$(value).datetimepicker();
	});
}

UPDATE:
It looks like quite a few people hitting this post are looking for a bootstrap specific alternative, Sebastien has provided a link to one in the comments below:
Bootstrap DatetimePicker.

Another one that looks really good, a bit less clunky than any of the alternatives I’ve seen: http://tarruda.github.com/bootstrap-datetimepicker/

Plain timepicker: http://jdewit.github.com/bootstrap-timepicker/

Plain datepicker: http://www.eyecon.ro/bootstrap-datepicker/

Let me know if you have any questions!

preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash – CakePHP

Hey everyone,

Ran into the following error while I was mucking around with CakePHP today:


preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash

The error seemed a little weird as I wasn’t using any regex. It turned out that it was because of my custom validation methods. I had marked them as private instead of public. A bit of an ambiguous error message so hopefully this will be able to help some of you out!

Paypal_Adaptive IPN Verification: INVALID – Ruby on Rails

Hey everyone,

I’ve been working with the PayPal_Adaptive gem recently and unfortunately I’ve run into a few issues. The latest of these has been that that my IPN verification was returning an INVALID response from Paypal.

I had made a few modifications to the provided payment_notification.rb file in order to accommodate for a few app specific requirements. This left me having to pass the original data attribute params. Unfortunately this wasn’t identical to the response that PayPal expected, I actually needed to use the following:


#Incorrect usage
verify_ipn(params)

#Correct usage
verify_ipn(request.raw_post)

I realised this error after reading Tanel’s post about securing your IPN interactions so make sure you check out his blog if you run into any more problems!

Thanks,
Chris

has_secure_password error – Ruby on Rails

Ran into the following error while using has_secure_password:

/usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/rubygems_integration.rb:143:in `gem': bcrypt-ruby is not part of the bundle. Add it to Gemfile. (Gem::LoadError)

Thankfully the error is pretty self explanatory, you simply have to add the gem bcrypt-ruby:

chris@chris-VirtualBox:~/cartsite$ gedit Gemfile

#Add gem to Gemfile
...
gem 'bcrypt-ruby'
...

#Run bundle install
chris@chris-VirtualBox:~/cartsite$ bundle install
Using rake (0.9.2.2) 
Using i18n (0.6.0) 
Using multi_json (1.3.6) 
...
Using uglifier (1.2.4) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

Then you should be right to go, let me know if there are any issues.

sqlite3.h is missing – Ruby on Rails

Just an error I ran into while running bundle install on a new ubuntu virtual:

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb 
checking for sqlite3.h... no
sqlite3.h is missing. Try 'port install sqlite3 +universal'
or 'yum install sqlite-devel' and check your shared library search path (the
location where your sqlite3 shared library is located).
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/bin/ruby1.8
	--with-sqlite3-dir
	--without-sqlite3-dir
	--with-sqlite3-include
	--without-sqlite3-include=${sqlite3-dir}/include
	--with-sqlite3-lib
	--without-sqlite3-lib=${sqlite3-dir}/lib
	--enable-local
	--disable-local

To fix it, simply run the following:

sudo apt-get install libsqlite3-dev

Could not find a JavaScript Runtime – Ruby on Rails

Ran into the following issue today starting a new app on a virtual Ubuntu box:

Could not find a JavaScript runtime

Thankfully there’s a quick fix, simply install nodejs:


chris@chris-VirtualBox:~/Desktop$ sudo apt-get install nodejs


Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  postgresql-client-8.4 postgresql-8.4
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  libc-ares2 libev4 libv8-3.1.8.22
The following NEW packages will be installed:
  libc-ares2 libev4 libv8-3.1.8.22 nodejs
0 upgraded, 4 newly installed, 0 to remove and 77 not upgraded.
Need to get 1,938 kB of archives.
After this operation, 6,066 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://au.archive.ubuntu.com/ubuntu/ oneiric/universe libv8-3.1.8.22 i386 3.1.8.22-1ubuntu2 [1,386 kB]
Get:2 http://au.archive.ubuntu.com/ubuntu/ oneiric/main libc-ares2 i386 1.7.4-1 [37.3 kB]        
Get:3 http://au.archive.ubuntu.com/ubuntu/ oneiric/universe libev4 i386 1:4.04-1 [29.5 kB]       
Get:4 http://au.archive.ubuntu.com/ubuntu/ oneiric/universe nodejs i386 0.4.9-1ubuntu3 [486 kB]  
Fetched 1,938 kB in 18s (106 kB/s)                                                               
Selecting previously deselected package libv8-3.1.8.22.
(Reading database ... 158699 files and directories currently installed.)
Unpacking libv8-3.1.8.22 (from .../libv8-3.1.8.22_3.1.8.22-1ubuntu2_i386.deb) ...
Selecting previously deselected package libc-ares2.
Unpacking libc-ares2 (from .../libc-ares2_1.7.4-1_i386.deb) ...
Selecting previously deselected package libev4.
Unpacking libev4 (from .../libev4_1%3a4.04-1_i386.deb) ...
Selecting previously deselected package nodejs.
Unpacking nodejs (from .../nodejs_0.4.9-1ubuntu3_i386.deb) ...
Processing triggers for doc-base ...
Processing 1 added doc-base file...
Registering documents with scrollkeeper...
Processing triggers for man-db ...
Setting up libv8-3.1.8.22 (3.1.8.22-1ubuntu2) ...
Setting up libc-ares2 (1.7.4-1) ...
Setting up libev4 (1:4.04-1) ...
Setting up nodejs (0.4.9-1ubuntu3) ...
update-alternatives: using /usr/bin/node to provide /usr/bin/js (js) in auto mode.
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
chris@chris-VirtualBox:~/Desktop$

Let me know if you have any issues.

undefined method `render_with_scope’ (Devise) – Ruby on Rails

I ran into the following error while trying to implement ReCaptcha with devise:

undefined method `render_with_scope' for #

The offending code: 

class Users::RegistrationsController < Devise::RegistrationsController
  def create

    #Verify captcha
    if verify_recaptcha
      super
    else
      build_resource
      clean_up_passwords(resource)
      flash.now[:alert] = "There was an error with the recaptcha code below. Please re-enter the code."
      render_with_scope :new
    end
  end
end

This error was caused by the fact that I’d followed an out of date tutorial. Devise no longer uses render_with_scope. Thankfully the solution was pretty straight forward, simply switch render_with_scope with render:

class Users::RegistrationsController < Devise::RegistrationsController
  def create

    #Verify captcha
    if verify_recaptcha
      super
    else
      build_resource
      clean_up_passwords(resource)
      flash.now[:alert] = "There was an error with the recaptcha code below. Please re-enter the code."
      render :new
    end
  end
end

There’s a brief explanation available at the following link: http://groups.google.com/group/plataformatec-devise/browse_thread/thread/596381554ba1fb04

POST http://192.168.1.3:3000 406 (Not Acceptable) – AJAX with Ruby on Rails

Just a quick post on an error I ran into today when trying to create an AJAX image upload with Ruby on Rails. When submitting an AJAX form I received the following error:

POST http://192.168.1.3:3000/uploads 406 (Not Acceptable)

It turns out that there is a fairly simple (and admittedly obvious) solution. Ensure that your controller has an appropriate response for JavaScript files:

i.e.
Form:

{:multipart => true}, :remote => 'true') do |f| %>
  
    

      
 prohibited this image from being saved:

      
        
          
            
  • 
        
      
    
    
  
  
    
    
    
      
    
    
  
    
  
    
     'button' %>
  
    
   @upload.product_id %>

    Form JavaScript:

    /* Wait for document to load */
$(document).ready(function() {
    create_ajax_form('new_upload');
})

/* Create an ajax form */
function create_ajax_form(form_id){

   //Handle ajax submission
   $j('#' + form_id).submit(function(){

       //Send for data
       $j.post($j(this).attr("action"), $j(this).serialize(), null, "script");

       //Return false
       return false;
   });
}

    Controller Action:

    #Create an upload
  def create

    #Create vars
    @upload = Upload.new(params[:upload])

    #Create responses
    respond_to do |format|
      if @upload.save

        #Retrieve product
        @product = Product.find_by_id(@upload.product_id)

        #Create success responses
        format.html { redirect_to @product, :notice => 'Image Added Successfully!'}
        format.js
      else

        #Create error responses
        format.html { render :action => 'new'}
        format.js
      end
    end
  end

    JavaScript Response:

    alert('test');