I vote for `rails_admin`. I like its looks and the fact that out of the box all the models are available for administration. The history feature is quite useful too.

Any project with Yehuda Katz as a mentor should be a safe bet.

I personally think the two could be merged, and have just raised the issue on both projects:

* https://github.com/sferik/rails_admin/issues/799
* https://github.com/gregbell/active_admin/issues/677

I think it would be great to take the best parts from both, and collaborate on the missing pieces.

I think it&#39;s really a matter of personal preference. More people are using rails_admin[*], but I prefer active_admin.

The reasons I chose ActiveAdmin were predominantly that it was developed with assumptions that I would make myself: using gems like devise and inherited_resources, and using a nice form builder (formtastic, though I would have chosen simple_form).

I actually prefer that not all models are exposed to the admin by default, though rails_admin supports that with &#39;config.included_models&#39;.

[*] Watches/forks on https://github.com/gregbell/active_admin vs https://github.com/sferik/rails_admin - though the gap is closing.

I have a file with some custom tags and I&#39;d like to write a regular expression to extract the string between the tags.  For example if my tag is:

&lt;!-- language: lang-none --&gt;

    [customtag]String I want to extract[/customtag]

How would I write a regular expression to extract only the string between the tags.  This code seems like a step in the right direction:

    Pattern p = Pattern.compile(&quot;[customtag](.+?)[/customtag]&quot;);
    Matcher m = p.matcher(&quot;[customtag]String I want to extract[/customtag]&quot;);

Not sure what to do next.  Any ideas?  Thanks.



MongoDB query multiple collections at once

I&#39;ve been looking into some rails admin plugins and came across these:

[https://github.com/gregbell/active_admin][1]

[https://github.com/sferik/rails_admin][2]

[https://github.com/thoughtbot/administrate][3] (EDIT: added later)

Any suggestions as to which one to go with. I would need it to support model associations and file uploads abilities. 


  [1]: https://github.com/gregbell/active_admin
  [2]: https://github.com/sferik/rails_admin
  [3]: https://github.com/thoughtbot/administrate

Rails Admin vs. ActiveAdmin

I've been looking into some rails admin plugins and came across these:
<a href="https://github.com/gregbell/active_admin" target="_blank" rel="noopener noreferrer">https://github.com/gregbell/active_admin</a>
<a href="https://github.com/sferik/rails_admin" target="_blank" rel="noopener noreferrer">https://github.com/sferik/rails_admin</a>
<a href="https://github.com/thoughtbot/administrate" target="_blank" rel="noopener noreferrer">https://github.com/thoughtbot/administrate</a> (EDIT: added later)
Any suggestions as to which one to go with. I would need it to support model associations and file uploads abilities.

I&#39;m using the carrierwave gem to upload files.

I have built a system for users to flag images as inappropriate and for admins to remove the images. From what I can tell, calling destroy on the image will only remove the path name from the table.

Is there a way to have carrierwave actually remove the file itself? Or should rails automatically remove the file when I destroy the image path?

How to make carrierwave delete the file when destroying a record?

I&#39;ve installed devise on my app and applied the following in my `application.html.erb` file:

    &lt;div id=&quot;user_nav&quot;&gt;
		&lt;% if user_signed_in? %&gt;
			Signed in as &lt;%= current_user.email %&gt;. This cannot be cheese?
			&lt;%= link_to &#39;Sign out&#39;, destroy_user_session_path %&gt;
		&lt;% else %&gt;
			&lt;%= link_to &#39;Register&#39;, new_user_registration_path %&gt; or &lt;%= link_to &#39;Sign in&#39;, new_user_session_path %&gt;
		&lt;% end %&gt;
	&lt;/div&gt;

I ran `rake routes` and confirmed that all the routes are valid.

Also, in my `routes.rb` file I have `devise_for :users` and `root :to =&gt; &quot;home#index&quot;`. 

I get the following routing error when clicking the &quot;Sign out&quot; link:

    No route matches &quot;/users/sign_out&quot;

Any ideas what&#39;s causing the error?

No route matches &quot;/users/sign_out&quot; devise rails 3

I have two models `restaurant` and `user` that I want to perform a has_and_belongs_to_many relationship.

I have already gone into the model files and added the `has_and_belongs_to_many :restaurants` and `has_and_belongs_to_many :users`

I assume at this point I should be able to do something like with Rails 3:

    rails generate migration ....

but everything I have tried seems to fail. I&#39;m sure this is something really simple I&#39;m new to rails so I&#39;m still learning.

Rails has_and_belongs_to_many migration

If I generate a new controller in Rails 3.1, also a javascript file with the name of the controller will added automatically. Firstly, I thought this javascript file will used only, when the related controller is called.

By default there is the instruction `//= require_tree .` in the `application.js`-file, that include every javascript file on it&#39;s tree.

How could I load only the controller specific script?

Rails 3.1 asset pipeline: how to load controller-specific scripts?

What does `bundle exec rake db:migrate` mean? Or just `bundle exec rake &lt;command&gt;` in general?

I understand that `bundle` takes care of maintaining things in the Gemfile.  I know what the word &quot;exec&quot; means.  I understand that `rake` maintains all the different scripty things you can do, and I know that `db:migrate` is one of those. I just don&#39;t know what all these words are doing together.  Why should `bundle` be used to execute `rake` to execute a database migrate?

What does bundle exec rake mean?

Right now I&#39;m doing a `split` on a string and assuming that the newline from the user is `\r\n` like so:

    string.split(/\r\n/)

What I&#39;d like to do is split on either `\r\n` or just `\n`.

So how what would the regex be to split on either of those?

Split on different newlines

I want to write a simple A+B program in ruby, but I have no idea how to work with the console.

Read input from console in Ruby?

I have a rake task that won&#39;t work unless a table exists. I&#39;m working with more than 20 engineers on a website so I want to make sure they have migrated the table before they can do a rake task which will populate that respective table.

Does AR have a method such as `Table.exists`? How can I make sure they have migrated the table successfully?

Check if a table exists in Rails

I looked around on how to change the dynamic params slot and found this post that does the exact thing.
The post is https://thoughtbot.com/blog/rails-patch-change-the-name-of-the-id-parameter-in

Basically what it does is, if following is the routes:

    map.resources :clients, :key =&gt; :client_name do |client|
      client.resources :sites, :key =&gt; :name do |site|
        site.resources :articles, :key =&gt; :title
      end
    end

These routes create the following paths:

    /clients/:client_name
    /clients/:client_name/sites/:name
    /clients/:client_name/sites/:site_name/articles/:title

One solution is to override the `def to_param` method in the model, but I want this without touching the model itself.

But since its for Rails 2.x, how can I achieve the same for Rails 3?

**Update**

This app is using Mongoid. Not AR.
So, the gem friendly cannot be used afaik.

Change the name of the :id parameter in Routing resources for Rails

I am playing with the console, I change some model code and now I want to test it. I normally re-start the console. Is there a quicker way? Maybe a console command to reload the model code?


Is there a Rails Console command (Rails 3+) to reload changed code?

I would like to remove every key from a hash except a given key. 

For example:

    {
     &quot;firstName&quot;: &quot;John&quot;,
     &quot;lastName&quot;: &quot;Smith&quot;,
     &quot;age&quot;: 25,
     &quot;address&quot;:
     {
         &quot;streetAddress&quot;: &quot;21 2nd Street&quot;,
         &quot;city&quot;: &quot;New York&quot;,
         &quot;state&quot;: &quot;NY&quot;,
         &quot;postalCode&quot;: &quot;10021&quot;
     },
     &quot;phoneNumber&quot;:
     [
         {
           &quot;type&quot;: &quot;home&quot;,
           &quot;number&quot;: &quot;212 555-1234&quot;
         },
         {
           &quot;type&quot;: &quot;fax&quot;,
           &quot;number&quot;: &quot;646 555-4567&quot;
         }
     ]
    }

I want to remove everything except &quot;firstName&quot; and/or &quot;address&quot;

Thanks

Hash remove all except specific keys

I am using [ActiveAdmin][1] gem in my project.

I have 2 models using has_many through association. The database schema looks exactly the same as the example in RailsGuide. [http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association][2]
[![has_many through association][3]][3]  
&lt;sub&gt;(source: [rubyonrails.org](http://guides.rubyonrails.org/images/has_many_through.png))&lt;/sub&gt;  



How can I use ActiveAdmin to ...

 1. show appointment date of each patient in physicians page?
 2. edit appointment date of each patient in physicians page?


Thanks all. :)
 

  [1]: https://activeadmin.info/
  [2]: https://guides.rubyonrails.org/association_basics.html#the-has_many-through-association
  [3]: https://i.stack.imgur.com/qaWFh.png

How to use ActiveAdmin on models using has_many through association?

I&#39;m trying to customise a ActiveAdmin form for a Recipe model that has a has_many relationship with Step.

    class Recipe &lt; ActiveRecord::Base
      has_many :steps
    end

    class Step &lt; ActiveRecord::Base
      acts_as_list :scope =&gt; :recipe
      
      belongs_to :recipe
    end

I have the following in my ActiveAdmin file with relation to this:

    form do |f|
      f.has_many :steps do |ing_f|
        ing_f.inputs
      end
    end

The following error is thrown when I try to load the form:
&gt; undefined method `new_record?&#39; for nil:NilClass

I&#39;ve isolated it so far to the has_many method but I&#39;m lost past this. Any advice and help would be appreciated!


ActiveAdmin with has_many problem; undefined method &#39;new_record?&#39;

Can **Active Admin** use my current **Devise** user model? It already has a column named `admin`, and if it&#39;s `true`, I&#39;d like to bypass the Active admin login, when going to `/admin`.

Is this possible?

Current routes:


    #Active admin
    ActiveAdmin.routes(self)
      
    #Devise
    devise_for :admin_users, ActiveAdmin::Devise.config
    devise_for :users, :path =&gt; &quot;account&quot;

The rest is basically standard Devise + Active admin

Rails 3 - Can Active_admin use an existing user model?

I&#39;m creating a helper to be used by Formtastic but I get the `undefined local variable or method` error. I don&#39;t know where to put it so it can work.

I already tried in the application_helper.rb and in app/helpers/active_admin/view_helpers.rb


Rails 3. How to add a helper that ActiveAdmin will use?

I have an activeadmin resource which has a belongs_to :user relationship.

When I create a new Instance of the model in active admin, I want to associate the currently logged in user as the user who created the instance (pretty standard stuff I&#39;d imagine).

So... I got it working with:

    controller do
      def create
        @item = Item.new(params[:item])
        @item.user = current_curator
        super
      end 
    end 

However ;)  I&#39;m just wondering how this works?  I just hoped that assigning the @item variable the user and then calling super would work (and it does).  I also started looking through the gem but couldn&#39;t see how it was actually working.

Any pointers would be great.  I&#39;m assuming this is something that InheritedResources gives you?

Thanks!

Rails: activeadmin overriding create action

I&#39;m upgrading to Rails 3.2, and running rake db:migrate gives me several errors of the form:

&gt; DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/01/04/rails-3-2-0-rc2-has-been-released. (called from &lt;top (required)&gt; at /app/Rakefile:7)

What&#39;s perplexing is that my `vendor/plugins` directory is empty -- is there another plugins directory that it&#39;s referencing?

Rails 2.3-style plugins and deprecation warnings running task in Heroku

I&#39;m getting this error: 

&gt; rake aborted!
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs, 

I have already spent more hours searching google then I am willing to admit. I believe this is an execJs bug.

From all the posts, this is a very common issue with rails 3.1. A js runtime is now needed by what are now standard gems like coffee-script and sass.

Most of these cases were resolved by adding the gems &#39;execjs&#39; and &#39;therubyracer&#39; to the app Gemfile, and then running &#39;bundle update&#39; and/or &#39;bundle install&#39;.  But not for me.

I guess I got lucky.  I am running rails 3.1.3/ruby 1.9 on an old version of Redhat Linux 4 (2.6.9-101.ELsmp) and gcc is 3.4.6.  

Other reported fixes don&#39;t help, I am unable to install &#39;nodejs&#39;, &#39;johnson&#39;, or &#39;mustang&#39;, the other runtimes execJs is supposed to locate and use.  They won&#39;t make/install on my system.

I need to fix the problem causing execJs to fail to locate &#39;therubyracer&#39;. Here is the Gemfile (and bundle install says Ok):

    source &#39;http://rubygems.org&#39;
    
    gem &#39;rails&#39;, &#39;3.1.3&#39;
    gem &#39;sqlite3&#39;
    gem &#39;sho-mongrel&#39;
    
    gem &#39;execjs&#39;
    gem &#39;therubyracer&#39;
    #gem &quot;therubyracer&quot;, :require =&gt; &#39;v8&#39;
    
    group :assets do
      gem &#39;sass-rails&#39;,   &#39;~&gt; 3.1.5&#39;
      gem &#39;coffee-rails&#39;, &#39;~&gt; 3.1.1&#39;
      gem &#39;uglifier&#39;, &#39;&gt;= 1.0.3&#39;
    end

And here is a trace:

    ~/rails/316-private-pub/chatter-after&gt;rake db:create --trace
    rake aborted!
    Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.
    /usr/local/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/lib/execjs/runtimes.rb:50:in `autodetect&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/lib/execjs.rb:5:in `&lt;module:ExecJS&gt;&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/lib/execjs.rb:4:in `&lt;top (required)&gt;&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `block (2 levels) in require&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `block in require&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler.rb:122:in `require&#39;
    /home/vitalarthur/rails/316-private-pub/chatter-after/config/application.rb:7:in `&lt;top (required)&gt;&#39;
    /usr/local/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require&#39;
    /usr/local/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require&#39;
    /home/vitalarthur/rails/316-private-pub/chatter-after/Rakefile:5:in `&lt;top (required)&gt;&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run&#39;
    /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `&lt;top (required)&gt;&#39;
    /usr/local/bin/rake:19:in `load&#39;
    /usr/local/bin/rake:19:in `&lt;main&gt;&#39;

There is nothing interesting in the development log.

Here is the execjs dir:

    /usr/local/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/lib/execjs&gt;ls
    disabled_runtime.rb  module.rb              ruby_rhino_runtime.rb  version.rb
    external_runtime.rb  mustang_runtime.rb     runtimes.rb
    johnson_runtime.rb   ruby_racer_runtime.rb  

I have also tried execjs-1.2.13.  Same problem.

If I comment execjs.rb below, I can run rake without the error:

    require &quot;execjs/module&quot;
    require &quot;execjs/runtimes&quot;
    
    module ExecJS
      self.runtime #||= Runtimes.autodetect
    end

But then I don&#39;t get a runtime.

I can see where the error text comes from in runtimes.rb:

    def self.autodetect
      from_environment || best_available ||
        raise(RuntimeUnavailable, &quot;Could not find a JavaScript runtime. &quot; +
          &quot;See https://github.com/sstephenson/execjs for a list of available runtimes.&quot;)
    end

So the question is, since I do have &#39;therubyracer&#39; installed, why can&#39;t runtimes.rb find it? Is execJs broken? 

Here it &#39;therubyracer&#39;:

    /usr/local/lib/ruby/gems/1.9.1/gems/therubyracer-0.9.9

How can I fix this?






 





execJs: &#39;Could not find a JavaScript runtime&#39; but execjs AND therubyracer are in Gemfile

I have a plugin with many types of files, and its own tree structure (html, css, js, documentation, images, etc)

Rather than going through the plugin folder, and splitting all the css and js files into the `vendor/assets/js/` `vendor/assets/css/` folders, I want to just keep the entire plugin folder as is. For example, 

`vendor/assets/multipurpose_bookshelf_slider/`

How do I make sure the paths load properly, and reference them in my manifest files?

Currently, I have some files place as follows (not exhaustive)

    /my_app/vendor/assets/multipurpose_bookshelf_slider/css/skin01.css
    /my_app/vendor/assets/multipurpose_bookshelf_slider/js/jquery.easing.1.3.js
    /my_app/vendor/assets/multipurpose_bookshelf_slider/
    /my_app/vendor/assets/multipurpose_bookshelf_slider/

I&#39;m referencing them in 

`application.js`

    //= require multipurpose_bookshelf_slider/js/jquery.easing.1.3.js
    //= require multipurpose_bookshelf_slider/js/jquery.bookshelfslider.min.js

`application.css.scss`

    @import &quot;css/bookshelf_slider&quot;;
    @import &quot;css/skin01&quot;;

Content Type	Original Author	Original Content on Stackoverflow
Question	erickreutz	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Harish Shetty	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	ndbroadbent	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	Michael Hellein	View Answer on Stackoverflow

Rails Admin vs. ActiveAdmin

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

MongoDB query multiple collections at once

Java regex to extract text between tags

Attributions