You need to call `reload!`

This command will clear the loaded constants that have been loaded and will load them as they&#39;re referenced in the console.

If you have old objects from before the `reload!` you will need to call `reload` on these individual objects or find new objects and work with them if you want to try out the new method.

You can type `reload!`.

I think it&#39;s important to note that `reload!` doesn&#39;t reinitialize rails console session existing objects, it just reloads the code:  
https://stackoverflow.com/a/10465369/9185715  
So, if you have instantiated any objects in the console, they won&#39;t be reinitialized.

I am a beginner at Objective-C and I am a bit confused at this scenario. I have the following code:

    if (number1 &lt; number2) {
        NSLog(@&quot;THE FOLLOWING NUMBER &quot;);
        NSLog(@&quot;%@&quot;, number1);
        NSLog(@&quot;IS LESS THAN&quot;);
        NSLog(@&quot;%@&quot;, number2);
    }

When I run this code I see really strange results like this:

    2011-07-06 20:38:18.044 helloworld[1014:207] THE FOLLOWING NUMBER 
    2011-07-06 20:38:18.047 helloworld[1014:207] 190.8776
    2011-07-06 20:38:18.050 helloworld[1014:207] IS LESS THAN
    2011-07-06 20:38:18.053 helloworld[1014:207] 96.75866

Both numbers are NSNumber objects, how could something like this happen? I am getting the two numbers by finding distances between sprites on the screen.

Any clues or advice would really be appreciated

Comparing NSNumbers in Objective C

Can lambda&#39;s be defined as class members?

For example, would it be possible to rewrite the code sample below using a lambda instead of a function object?

    struct Foo {
        std::function&lt;void()&gt; bar;
    };


The reason I wonder is because the following lambda&#39;s can be passed as arguments:

    template&lt;typename Lambda&gt;
    void call_lambda(Lambda lambda) // what is the exact type here?
    { 
        lambda();
    }
    
    int test_foo() {
        call_lambda([]() { std::cout &lt;&lt; &quot;lambda calling&quot; &lt;&lt; std::endl; });
    }

I figured that if a lambda can be passed as a function argument then maybe they can also be stored as a member variable.

After more tinkering I found that this works (but it&#39;s kind of pointless):

    auto say_hello = [](){ std::cout &lt;&lt; &quot;Hello&quot;; };
    struct Foo {
        typedef decltype(say_hello) Bar;
        Bar bar;
        Foo() : bar(say_hello) {}
    };



C++11 lambda as member variable?

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?

<p>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?</p>


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 wanna do something like this in rails
&lt;input type=&quot;hidden&quot; name=&quot;service&quot; value=&quot;test&quot; /&gt;

Here is what I have so far in rails: 
    
    &lt;%= form_for @order do |f| %&gt;
      &lt;%= f.hidden_field :service, &quot;test&quot; %&gt;
      &lt;%= f.submit %&gt;
    &lt;% end %&gt;

But then I get this error:

    undefined method `merge&#39; for &quot;test&quot;:String

How can I pass values in my hidden_field in rails?

Rails hidden field undefined method &#39;merge&#39; error

I&#39;m using devise for user auth, but I have nice mockups for the signup, login, etc. pages.
I&#39;ve already done the `rails generate devise:views User` command and have all of the views in the views folder, however, when I replaced the registration/new.html.erb with my own new.html.erb, nothing changes nor looks different. It&#39;s as if I had done anything.

Anyone know what I&#39;m doing wrong or at least how to successfully customize devise views

P.S. Is it important to note that I changed the route of devise/registration#new to /signup?

Customizing Devise views in Rails

    https://github.com/intridea/omniauth.git (at master) is not checked out. Please run `bundle install` (Bundler::GitError)


So what do I do? bundle install works on development, but when I push and deploy to my production server. I get this error, even after running bundle install on my production server.

is not checked out... bundle install does NOT fix help!

Up until now I have only used `database.yml` with each parameter called out explicitly, in the file below it uses some characters I do not understand. What does each line and symbol(`&amp;`, `*`, `&lt;&lt;`) mean? How do I read this file?

    development: &amp;default
      adapter: postgresql
      database: dev_development
    
    test: &amp;test
      &lt;&lt;: *default
      database: test_test
    
    
    cucumber:
      &lt;&lt;: *test
    
    production:
      &lt;&lt;: *default
      database: test_production

What do the &amp;,&lt;&lt;, * mean in this database.yml file?

Can someone provide an example on how to use switch case in Ruby for variable?

Ruby on Rails Switch

From what I understand about `self`, it refers to the current instance of the class.

Isn&#39;t this the default behaviour at all times anyways? For example, isn&#39;t

    self.var_one = method(args)

equivalent to

    var_one = method(args) 

If so, what is the use of `self`?


How to use Ruby&#39;s self keyword

I have a view that displays multiple images and those images&#39; associated tags. I decided to use a partial view for each image and its tags, but I am having trouble passing in the image object into the partial view. Here is the main view&#39;s relevant code:

    &lt;table&gt;
      &lt;% @images.each do |i| %&gt;
        &lt;tr&gt;
          &lt;%= render :partial =&gt; :image_tag, :image =&gt; i %&gt;
        &lt;/tr&gt;
      &lt;% end %&gt;
    &lt;/table&gt;

Here is the partial view&#39;s relevant code (partial view is named _image_tag.html.erb):

    &lt;table&gt;
      &lt;%= image.id %&gt;
      &lt;%= image_tag image.src %&gt;
    &lt;/table&gt;

I read in [this][1] thread that I can pass in the image object the way that I am currently doing it. I tried passing in the id through an options hash on the render method, and that also didn&#39;t work. The error I am getting is:

    undefined method `model_name&#39; for Symbol:Class

centered around the line where I am calling render :partial in the main view.


  [1]: https://stackoverflow.com/questions/4700617/pass-an-variable-into-a-partial-rails-3

Passing parameters to partial view

I tried `:include_blank =&gt; true`, but it didn&#39;t work.

    &lt;select&gt;
        &lt;%= options_for_select Model.all.collect{|mt| [mt.name, mt.id]} %&gt;
    &lt;/select&gt;

If I need to add it to the collection, how would you do that?

Include blank for first item in select list in options_for_select tag

I am a beginner in rails and jQuery. I have two separate forms in one page and I want to submit them separately in ajax way (with jQuery). This is how far I got. Can anybody add or fix this code to make it work. I am using Rails 3.1 and jQuery 1.6. Thank you in advance.   

application.js
    
    $(&quot;.savebutton&quot;).click(function() { 
        $(&#39;form&#39;).submit(function() {
             $(this).serialize();
        });
    }); 

first form:
         
    &lt;%=form_for :users do |f| %&gt;
      &lt;fieldset&gt;
        &lt;legend&gt;Basic details&lt;/legend&gt;
        &lt;%= f.label :school %&gt;
        &lt;%= f.text_field :school,:size=&gt;&quot;45&quot;,:class=&gt;&quot;round&quot;,:id=&gt;&quot;school&quot; %&gt;&lt;br/&gt;      
      &lt;/fieldset&gt;
      &lt;p&gt;&lt;%= button_to &quot;save and continue&quot;,{:class=&gt;&quot;savebutton&quot;} %&gt;&lt;/p&gt;
    &lt;%end%&gt;
 
second form:

    &lt;%=form_for :courses do |c| %&gt;
      &lt;fieldset&gt;
        &lt;legend&gt;Your current classes&lt;/legend&gt;
        &lt;label&gt;class:&lt;/label&gt;&lt;%= c.text_field :subject,:size=&gt;&quot;45&quot;,:class=&gt;&quot;round&quot; %&gt;&lt;br/&gt;
      &lt;/fieldset&gt;
      &lt;p&gt;&lt;%= button_to &quot;save and continue&quot;,{:class=&gt;&quot;savebutton&quot;} %&gt;&lt;/p&gt;
    &lt;%end%&gt;

SchoolController

    class SchoolController &lt; ApplicationController
      respond_to :json
      def create
        @school = current_user.posts.build(params[:school].merge(:user =&gt; current_user))
        if @school.save
          respond_with @school
        else
          respond_with @school.errors, :status =&gt; :unprocessable_entity
        end
      end
    end

CourseController is in the same shape as SchoolController
    

Content Type	Original Author	Original Content on Stackoverflow
Question	Matteo Melani	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	apneadiving	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	karlingen	View Answer on Stackoverflow
Solution 3 - Ruby on-Rails	Maxim Berdnikov	View Answer on Stackoverflow

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

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Solution 3 - Ruby on-Rails

C++11 lambda as member variable?

Comparing NSNumbers in Objective C

Attributions