Is there a reason you&#39;re not using REST for this? It would make your life a lot easier and requires much less code. If you&#39;re set on using this custom action, you will need to specify the url and probably the method:

    &lt;%= simple_form_for @photographer, :url =&gt; savenew_photographers_path, :method =&gt; :post ... # etc

I am wondering if there is a special method/trick to check if a `String` object is null. I know about the [`String.IsNullOrEmpty`][1] method but I want to differentiate a `null` String from an empty String (=`&quot;&quot;`).

Should I simply use:

    if (s == null) {
        // blah blah...
    }

...or is there another way?

  [1]: http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx

How to check if String is null

I have following datepicker script: 

    &lt;script&gt;
     $(function(){
            $(&quot;#to&quot;).datepicker();
            $(&quot;#from&quot;).datepicker().bind(&quot;change&quot;,function(){
                var minValue = $(this).val();
                minValue = $.datepicker.parseDate(&quot;mm/dd/yy&quot;, minValue);
                minValue.setDate(minValue.getDate()+1);
                $(&quot;#to&quot;).datepicker( &quot;option&quot;, &quot;minDate&quot;, minValue );
            })
        });
    &lt;/script&gt; 

Now dateformat is MM/DD/YY .how to change the date format to YYYY-MM-DD? 

How to change date format (MM/DD/YY) to (YYYY-MM-DD) in date picker

I am trying to define the action &quot;savenew&quot; in admin/photographers controller.

I have tried this:

    &lt;%= simple_form_for(:photographer_savenew, :action =&gt; &#39;savenew&#39;, :id  =&gt; params[:id],  :multipart =&gt; true ) do |f| %&gt;

But the action in the form is still: `/admin/photographers`

When it should be: `/admin/photographers/savenew`


How to define action with simple form for?

I am trying to define the action "savenew" in admin/photographers controller.
I have tried this:
<pre><code class="hljs language-ruby">&#x3C;%= simple_form_for(:photographer_savenew, :action => 'savenew', :id => params[:id], :multipart => true ) do |f| %>
</code></pre>
But the action in the form is still: <code>/admin/photographers</code>
When it should be: <code>/admin/photographers/savenew</code>

How do [Formtastic][1] and [simple_form][2] compare?
What are the pros and cons of each?

[1]: https://github.com/formtastic/formtastic
[2]: https://github.com/heartcombo/simple_form

How do Formtastic and simple_form compare?

When using `gem install gem_name` I can pass `--no-rdoc` and `--no-ri` switches to skip generating RDoc/RI documentation for the gem on install.

Is there a similar way to do this with `bundle install`?

Using --no-rdoc and --no-ri with bundler

I have started my journey with TDD in Rails and have run into a small issue regarding tests for model validations that I can&#39;t seem to find a solution to. Let&#39;s say I have a User model,

    class User &lt; ActiveRecord::Base
      validates :username, :presence =&gt; true
    end

and a simple test

    it &quot;should require a username&quot; do
      User.new(:username =&gt; &quot;&quot;).should_not be_valid
    end

This correctly tests the presence validation, but what if I want to be more specific? For example, testing full_messages on the errors object..

    it &quot;should require a username&quot; do
      user = User.create(:username =&gt; &quot;&quot;)
      user.errors[:username].should ~= /can&#39;t be blank/
    end

My concern about the initial attempt (using should_not be_valid) is that RSpec won&#39;t produce a descriptive error message. It simply says &quot;expected valid? to return false, got true.&quot; However, the second test example has a minor drawback: it uses the create method instead of the new method in order to get at the errors object.

I would like my tests to be more specific about what they&#39;re testing, but at the same time not have to touch a database.

Anyone have any input?

Rails 3.1, RSpec: testing model validations

I need to add timestamps (`created_at` &amp; `updated_at`) to an existing table. I tried the following code but it didn&#39;t work.

    class AddTimestampsToUser &lt; ActiveRecord::Migration
        def change_table
            add_timestamps(:users)
        end
    end

Add timestamps to an existing table

Lets say I have this Hash:

    {
      :info =&gt; [
        {
            :from =&gt; &quot;Ryan Bates&quot;,
            :message =&gt; &quot;sup bra&quot;,
            :time =&gt; &quot;04:35 AM&quot;
        }
      ]
    }

I can call the info array by doing `hash[:info]`.

Now when I turn this into JSON (JSON.generate), and then parse it (JSON.parse), I get this hash:

    {
      &quot;info&quot; =&gt; [
        {
            &quot;from&quot; =&gt; &quot;Ryan Bates&quot;,
            &quot;message&quot; =&gt; &quot;sup bra&quot;,
            &quot;time&quot; =&gt; &quot;04:35 AM&quot;
        }
      ]
    }

Now if I use `hash[:info]` it returns `nil`, but not if I use `hash[&quot;info&quot;]`.

Why is this? And is there anyway to fix this incompatibility (besides using string keys from the start)?

Ruby JSON parse changes Hash keys

After running the `bundle install` command, *&#39;Gemfile.lock*&#39; is created in the working directory. What do the directives inside that file mean?

For example, let&#39;s take the following file:

    PATH
      remote: .
      specs:
        gem_one (0.0.1)

    GEM
      remote: http://example.org/
      specs:
        gem_two (0.0.2)
        gem_three (0.0.3)
          gem_four (0.0.4)

    PLATFORMS
      platform

    DEPENDENCIES
      gem_two
      gem_one!

What do &#39;*PATH*&#39;, &#39;*GEM*&#39;, &#39;*PLATFORMS*&#39; and &#39;*DEPENDENCIES*&#39; describe? Are all of them required?

What should contain the &#39;*remote*&#39; and &#39;*specs*&#39; subdirectives?

What does the exclamation mark after the gem name in the &#39;*DEPENDENCIES*&#39; group mean?

Understanding the Gemfile.lock file

I find myself preferring `if not` rather than `unless`. Is there a proper way to write that sort of condition? How do people generally feel about `unless`?

Ruby: unless vs if not

In the [Ruby Koans][1], the section about_hashes.rb includes the following code and comment:

    def test_changing_hashes
        hash = { :one =&gt; &quot;uno&quot;, :two =&gt; &quot;dos&quot; }
        hash[:one] = &quot;eins&quot;

        expected = { :one =&gt; &quot;eins&quot;, :two =&gt; &quot;dos&quot; }
        assert_equal true, expected == hash

        # Bonus Question: Why was &quot;expected&quot; broken out into a variable
        # rather than used as a literal?
    end

I can&#39;t figure out the answer to the bonus question in the comment - I tried actually doing the substitution they suggest, and the result is the same. All I can figure out is that it is for readability, but I don&#39;t see general programming advice like that called out elsewhere in this tutorial.

(I know this sounds like something that would already be answered somewhere, but I can&#39;t dig up anything authoritative.)


  [1]: http://rubykoans.com

What is the answer to the bonus question in test_changing_hashes of Ruby Koans?

What does &quot;Argument Error: wrong number of arguments (1 for 0)&quot; mean?

What does &quot;wrong number of arguments (1 for 0)&quot; mean in Ruby?

I&#39;m trying to do a redirect while setting the flash[:error] value. (Rails 3.0.10)

In my view I have

    &lt;p id=&quot;error&quot;&gt;&lt;%= flash[:error] %&gt;&lt;/p&gt;
    &lt;p id=&quot;notice&quot;&gt;&lt;%= flash[:notice] %&gt;&lt;/p&gt;

If I do a `redirect_to show_path, :notice =&gt; &quot;ok&quot;` it works fine, but if I do `redirect_to show_path, :error =&gt; &quot;error&quot;` it doesn&#39;t show up.

what could I be missing?


Rails: redirect_to with :error, but flash[:error] empty

This works for any strings that have whitespaces in them

    str.downcase.tr!(&quot; &quot;, &quot;_&quot;)

but strings that dont have whitespaces just get deleted

So &quot;New School&quot; would change into &quot;new_school&quot; but &quot;color&quot; would be &quot;&quot;, nothing!

how to safely replace all whitespaces with underscores with ruby?

Trying to search where movies coming out have a release date greater than today&#39;s date

     Movie.where(&#39;release &gt; ?&#39;, Date.today)
    ActiveRecord::StatementInvalid: Mysql::ParseError: You have an error in your SQL     syntax;    check the manual that corresponds to your MySQL server version for the right syntax to use near &#39;release &gt; &#39;2011-09-25&#39;)&#39; at line 1: SELECT `movies`.* FROM `movies` WHERE (release &gt; &#39;2011-09-25&#39;)




Rails where date is greater than given date query

I have a particularly complex model with validations and callbacks defined. The business needs now calls for a particular scenario where adding a new record requires skipping the validations and callbacks. What&#39;s the best way to do this?

Rails 3 skip validations and callbacks

I am using simple_form gem, I have a countries collection, it work fine when I select the country, and updated record will have the country id stored, but, when I try to edit the record, the chosen country is not selected by default at edit form.

Here is the code at edit form:

    = f.input :country_id, :collection =&gt; all_countries
    
Shouldn&#39;t simple_form view the selected country from the db ?

rails, simple_form, how to set selected index of a collection when page loaded?

I have an existing form which is tied to a model named &#39;Order&#39;, but i want to add new form fields that will capture Credit Card info such as name, cc number, etc to be processed on a 3rd party payment gateway.

But since i don&#39;t want to save CC info in our database, there are no corresponding columns of that in my order table. And this gives me an error when submitting the form that those Credit card input fields are not &#39;part&#39; of the order model. 



rails simple_form fields not related to the model

**im trying to do default value for input**

works ok:

    &lt;%= f.input_field :quantity, default: &#39;1&#39; %&gt; 

but i need f.input not f.input_field

    &lt;%= f.input :quantity %&gt; 

&lt;br /&gt;


- im trying it with standard html value - but after unsucessfull validation quantity is overriden by 1 - undesired

        &lt;%= f.input :quantity, input_html: {value: &#39;1&#39;} %&gt;


- when i remove value and validation is unsucessfull quantity is populated - everything is ok

        &lt;%= f.input :quantity %&gt;

**how to solve this ? 
is there any alternative like in f.input_field - :default ?
or there is any other solution with value ?** 

Content Type	Original Author	Original Content on Stackoverflow
Question	Rails beginner	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Peter Brown	View Answer on Stackoverflow

How to define action with simple form for?

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

How to change date format (MM/DD/YY) to (YYYY-MM-DD) in date picker

How to check if String is null

Attributions