You can config to use ActiveRecord generators in your config/application.rb


    config.generators do |g| 
      g.orm :active_record 
    end

my Haskell[*](#foot) is a bit rusty, so i can imagine that I’m missing the obvious:

	def any[A](s: Traversable[A], f: A =&gt; Boolean): Boolean = {
		s.foldLeft(false)((bool, elem) =&gt; bool || f(elem))
	}

Does one of these properties apply to the it?

1. predefined somewhere in the Scala libs
2. circumstantial, and faster written as some one-liner
3. wrong (I didn’t test it, sorry ;))

---

&lt;a title=&quot;foot&quot;&gt;*&lt;/a&gt;actually SML, but that’s 99% the same, but known by nobody under the sun.

Scala: “any” and “all” functions

How do I check if a phone number is valid or not? It is up to length 13 (including character `+` in front).

How do I do that?

I tried this:

    String regexStr = &quot;^[0-9]$&quot;;

    String number=entered_number.getText().toString();	
	    					
    if(entered_number.getText().toString().length()&lt;10 || number.length()&gt;13 || number.matches(regexStr)==false  ) {
    	Toast.makeText(MyDialog.this,&quot;Please enter &quot;+&quot;\n&quot;+&quot; valid phone number&quot;,Toast.LENGTH_SHORT).show();
    	// am_checked=0;
    }`

And I also tried this:

    public boolean isValidPhoneNumber(String number)
	{
	     for (char c : number.toCharArray())
	     {
	         if (!VALID_CHARS.contains(c))
	         {
	            return false;
	         }
	     }
	     // All characters were valid
	     return true;
	}

Both are not working.

Input type: `+ sign to be accepted and from 0-9 numbers and length b/w 10-13 and should not accept other characters`

Phone number validation Android

I&#39;m using MongoDB via Mongoid integration, as well as ActiveRecord in a project.  I would like to generate migrations for active record, and Mongoid is the default when I run.

    rails g migration

Any ideas how to specify AR as my default generator for migrations, models, etc?

Thanks!

Using Active Record generators after Mongoid installation?

I'm using MongoDB via Mongoid integration, as well as ActiveRecord in a project. I would like to generate migrations for active record, and Mongoid is the default when I run.
<pre><code class="hljs">rails g migration
</code></pre>
Any ideas how to specify AR as my default generator for migrations, models, etc?
Thanks!

I have a Rails 3.1 project with the asset pipeline working great. The problem is that I need to reference images in my Sass, but Rails calculates image URLs. (This is particularly important in production, where Rails appends the Git hash of the image to its filename to bust caches.)

For example, in `app/assets/stylesheets/todos.css.scss`:

    .button.checkable { background-image: url(/assets/tick.png); }

When I deploy (or run `rake assets:precompile`), the file `app/assets/images/tick.png` is moved to `public/assets/tick-48fe85c0a.png` or something similar. This breaks the CSS. [This post][1] makes two suggestions:

 1. don&#39;t use the asset pipeline for images -- instead put them in `public/images/` and reference them directly
 2. use ERB for your CSS and let Rails work out the image URL.

Number 1 is certainly a possibility, though it means I don&#39;t get cache-busting on my images. Number 2 is out because I&#39;m using Sass, not ERB to process the files.


  [1]: https://moocode.com/posts/1-deploying-a-rails-3-1-application-to-production

How do I use reference images in Sass when using Rails 3.1?

I was wondering if maybe there was some already built in function for rails so that it would create a select drop down list with all the U.S. states so I wouldn&#39;t have to enter it manually. I searched online but I was unable to find any. Any suggestions on what to do so I don&#39;t have to manually enter all the states?

Rails Select Drop Down for States?

Every time I want to POST an array of JSON objects with jQuery to Rails, I have this problem.
If I stringify the array I can see that jQuery is doing its work correctly:

    &quot;shared_items&quot;=&gt;&quot;[{\&quot;entity_id\&quot;:\&quot;253\&quot;,\&quot;position\&quot;:1},{\&quot;entity_id\&quot;:\&quot;823\&quot;,\&quot;position\&quot;:2}]&quot;

But if I just send the array it as the data of the AJAX call I get:

    &quot;shared_items&quot;=&gt;{&quot;0&quot;=&gt;{&quot;entity_id&quot;=&gt;&quot;253&quot;, &quot;position&quot;=&gt;&quot;1&quot;}, &quot;1&quot;=&gt;{&quot;entity_id&quot;=&gt;&quot;823&quot;, &quot;position&quot;=&gt;&quot;2&quot;}}

Whereas if I just send a plain array it works:

    &quot;shared_items&quot;=&gt;[&quot;entity_253&quot;]

Why is Rails changing the array to that strange hash? The only reason that comes to mind is that Rails can&#39;t correctly understand the contents because there is no type here (is there a way to set it in the jQuery call?):

    Processing by SharedListsController#create as 

Thank you!

**Update:**
I&#39;m sending the data as an array, not a string and the array is created dynamically using the `.push()` function. Tried with `$.post` and `$.ajax`, same result.

Rails not decoding JSON from jQuery correctly (array becoming a hash with integer keys)

RVM is running into a certificate error when trying to download Ruby 1.9.2.  It looks like `curl` is having a certificate issue but I am not sure how to bypass it.  I have included the exact error info below.

    $ rvm install 1.9.2
    Installing Ruby from source to: /Users/willdennis/.rvm/rubies/ruby-1.9.2-p180, this may take a while depending on your cpu(s)...
    
    ruby-1.9.2-p180 - #fetching 
    ERROR: Error running &#39;bunzip2 &#39;/Users/willdennis/.rvm/archives/ruby-1.9.2-p180.tar.bz2&#39;&#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/extract.log
    ruby-1.9.2-p180 - #extracting ruby-1.9.2-p180 to /Users/willdennis/.rvm/src/ruby-1.9.2-p180
    ruby-1.9.2-p180 - #extracted to /Users/willdennis/.rvm/src/ruby-1.9.2-p180
    Fetching yaml-0.1.3.tar.gz to /Users/willdennis/.rvm/archives
    
    curl: (60) SSL certificate problem, verify that the CA cert is OK. Details:
    error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
    More details here: http://curl.haxx.se/docs/sslcerts.html
    
    curl performs SSL certificate verification by default, using a &quot;bundle&quot;
     of Certificate Authority (CA) public keys (CA certs). The default
     bundle is named curl-ca-bundle.crt; you can specify an alternate file
     using the --cacert option.
    If this HTTPS server uses a certificate signed by a CA represented in
     the bundle, the certificate verification probably failed due to a
     problem with the certificate (it might be expired, or the name might
     not match the domain name in the URL).
    If you&#39;d like to turn off curl&#39;s verification of the certificate, use
     the -k (or --insecure) option.
    ERROR: There was an error, please check /Users/willdennis/.rvm/log/ruby-1.9.2-p180/*.log. Next we&#39;ll try to fetch via http.
    Trying http:// URL instead.
    
    curl: (60) SSL certificate problem, verify that the CA cert is OK. Details:
    error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
    More details here: http://curl.haxx.se/docs/sslcerts.html
    
    curl performs SSL certificate verification by default, using a &quot;bundle&quot;
     of Certificate Authority (CA) public keys (CA certs). The default
     bundle is named curl-ca-bundle.crt; you can specify an alternate file
     using the --cacert option.
    If this HTTPS server uses a certificate signed by a CA represented in
     the bundle, the certificate verification probably failed due to a
     problem with the certificate (it might be expired, or the name might
     not match the domain name in the URL).
    If you&#39;d like to turn off curl&#39;s verification of the certificate, use
     the -k (or --insecure) option.
    ERROR: There was an error, please check /Users/willdennis/.rvm/log/ruby-1.9.2-p180/*.log
    Extracting yaml-0.1.3.tar.gz to /Users/willdennis/.rvm/src
    ERROR: Error running &#39;tar zxf /Users/willdennis/.rvm/archives/yaml-0.1.3.tar.gz -C /Users/willdennis/.rvm/src --no-same-owner&#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/extract.log
    /Users/willdennis/.rvm/scripts/functions/packages: line 55: cd: /Users/willdennis/.rvm/src/yaml-0.1.3: No such file or directory
    Configuring yaml in /Users/willdennis/.rvm/src/yaml-0.1.3.
    ERROR: Error running &#39; ./configure --prefix=&quot;/Users/willdennis/.rvm/usr&quot;  &#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/configure.log
    Compiling yaml in /Users/willdennis/.rvm/src/yaml-0.1.3.
    ERROR: Error running &#39;/usr/bin/make &#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/make.log
    Installing yaml to /Users/willdennis/.rvm/usr
    ERROR: Error running &#39;/usr/bin/make install&#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/make.install.log
    ruby-1.9.2-p180 - #configuring 
    ERROR: Error running &#39; ./configure --prefix=/Users/willdennis/.rvm/rubies/ruby-1.9.2-p180 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/willdennis/.rvm/usr &#39;, please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/configure.log
    ERROR: There has been an error while running configure. Halting the installation.

How can I resolve or avoid this error?





Curl Certificate Error when Using RVM to install Ruby 1.9.2

Are `after_create` and `after_save` the same as per functionality?

I want to do an operation with the email of a user after its account creation.

I want to do that operation when it is saved in the database.

which is preferable to use:  `after_create` or `after_save`?


What is the difference between `after_create` and `after_save` and when to use which?

I have the following php-codeigniter script which attempts to increment a field of a record using active-record syntax:

    $data = array(&#39;votes&#39; =&gt; &#39;(votes + 1)&#39;);
    $this-&gt;db-&gt;where(&#39;id&#39;, $post[&#39;identifier&#39;]);
    $this-&gt;db-&gt;update(&#39;users&#39;, $data);

This produces the following SQL:

`&quot;UPDATE `users` SET `votes` = &#39;(votes + 1)&#39; WHERE `id` = &#39;44&#39;`&quot;

Which doesn&#39;t run, but this SQL does do what I&#39;m looking for:
`&quot;UPDATE `users` SET `votes` = (votes + 1) WHERE `id` = &#39;44&#39;`&quot;` &lt;--Note the lack of quotes around (votes + 1)

Does anyone know how to implement this type of query with codeigniter&#39;s active record syntax?


Increment field of mysql database using codeigniter&#39;s active record syntax

I&#39;ve written a couple of complex queries (at least to me) with Ruby on Rail&#39;s query interface:

    
    watched_news_posts = Post.joins(:news =&gt; :watched).where(:watched =&gt; {:user_id =&gt; id})
    watched_topic_posts = Post.joins(:post_topic_relationships =&gt; {:topic =&gt; :watched}).where(:watched =&gt; {:user_id =&gt; id})

Both of these queries work fine by themselves.  Both return Post objects.  I would like to combine these posts into a single ActiveRelation.  Since there could be hundreds of thousands of posts at some point, this needs to be done at the database level.  If it were a MySQL query, I could simply user the `UNION` operator.  Does anybody know if I can do something similar with RoR&#39;s query interface?

ActiveRecord Query Union

I&#39;m try to save a hash mapping ids to a number of attempts in my rails app. My migration to the database to accommodate this new column:

    class AddMultiWrongToUser &lt; ActiveRecord::Migration
      def self.up
        add_column :users, :multi_wrong, :string
      end
    
      def self.down
        remove_column :users, :multi_wrong
      end
    end

In my model I have:

    class User &lt; ActiveRecord::Base 
     serialize :multi_wrong, Hash
    end

But when I use the rails console to test this by doing:

    user = User.create()
    user.multi_wrong = {&quot;test&quot;=&gt;&quot;123&quot;}
    user.save


The output is false. What&#39;s going wrong here?

Using Rails serialize to save hash to database

I am looking for the best approach to delete records from a table. For instance, I have a user whose user ID is across many tables. I want to delete this user and every record that has his ID in all tables.

    u = User.find_by_name(&#39;JohnBoy&#39;)
    u.usage_indexes.destroy_all
    u.sources.destroy_all
    u.user_stats.destroy_all
    u.delete

This works and removes all references of the user from all tables, but I heard that `destroy_all` was very process heavy, so I tried `delete_all`. It only removes the user from his own user table and the `id` from all the other tables are made null, but leaves the records intact in them. Can someone share what the correct process is for performing a task like this? 

I see that `destroy_all` calls the `destroy` function on all associated objects but I just want to confirm the correct approach.


delete_all vs destroy_all?

Say, we have something like this:

    add_column :users, :single, :boolean
    add_index :users, :single

and then later we do

    rename_column :users, :single, :married

Will ActiveRecord and/or the database handle the renaming of the index as well or do I have to manually drop the index and add it again?

Does rename_column take care of indexes?

Using this modified example from [the Rails guides][1], how does one model a relational &quot;has_many :through&quot; association using mongoid?

The challenge is that mongoid does not support has_many :through as ActiveRecord does.

    # doctor checking out patient
    class Physician &lt; ActiveRecord::Base
      has_many :appointments
      has_many :patients, :through =&gt; :appointments
      has_many :meeting_notes, :through =&gt; :appointments
    end
    
    # notes taken during the appointment
    class MeetingNote &lt; ActiveRecord::Base
      has_many :appointments
      has_many :patients, :through =&gt; :appointments
      has_many :physicians, :through =&gt; :appointments
    end
    
    # the patient
    class Patient &lt; ActiveRecord::Base
      has_many :appointments
      has_many :physicians, :through =&gt; :appointments
      has_many :meeting_notes, :through =&gt; :appointments
    end
     
    # the appointment
    class Appointment &lt; ActiveRecord::Base
      belongs_to :physician
      belongs_to :patient
      belongs_to :meeting_note
      # has timestamp attribute
    end


  [1]: http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association

How to implement has_many :through relationships with Mongoid and mongodb?

Is there any difference between using the field ID or _ID from a MongoDB document?

I am asking this, because I usually use &quot;_id&quot;, however I saw this sort({id:-1}) in the documentation: http://www.mongodb.org/display/DOCS/Optimizing+Object+IDs#OptimizingObjectIDs-Sortbyidtosortbyinsertiontime

**EDIT**

Turns out the docs were wrong.

Difference between &quot;id&quot; and &quot;_id&quot; fields in MongoDB

I modified a model so it includes a new field, such as...

`field :url, :type =&gt; String`

I use activeadmin, so when I create a new entry `@model.url` is empty, and in entries created before changing the schema it&#39;s nil. How do I select both? I have tried:

    # Returns nils and strings
    Model.where(:url.ne =&gt; &quot;&quot;).count 

    # Returns strings and &quot;&quot;
    Model.where(:url.ne =&gt; nil).count

    # Returns strings, nils and &quot;&quot;
    Model.where(:url.ne =&gt; [&quot;&quot;, nil]).count 

Or, if there&#39;s a best practice for this kind of scenario please let me know.

Select where not null or empty in mongoid

I would like to know if there&#39;re a command to drop every databases from my MongoDB?

I know if I want to drop only one datatable, I just need to type the name of the database like the code below but I dont want to have to specify it.

    mongo DB_NAME --eval &#39;db.dropDatabase();&#39;

MongoDB drop every database

This is my document:

    { 
        title:&quot;Happy thanksgiving&quot;,
        body: &quot;come over for dinner&quot;,
        blocked:[
           {user:333, name:&#39;john&#39;},
           {user:994, name:&#39;jessica&#39;},
           {user:11, name: &#39;matt&#39;},
        ]
    }

What is the query to find all documents that do not have user 11 in &quot;blocked&quot;?

How do I do a &quot;NOT IN&quot; query in Mongo?

My question is a variation of [this one][1].

Since my Java Web-app project requires a lot of read filters/queries and interfaces with tools like GridFS, I&#39;m struggling to think of a sensible way to employ MongoDB in the way the above solution suggests.

Therefore, I&#39;m considering running an embedded instance of MongoDB alongside my integration tests. I&#39;d like it to **start up automatically** (either for each test or the whole suite), **flush the database** for every test, and **shut down** at the end. These tests might be run on development machines as well as the CI server, so my solution will also need to be **portable**.

Can anyone with more knowledge on MongoDB help me get idea of the feasibility of this approach, and/or perhaps suggest any reading material that might help me get started?

I&#39;m also open to other suggestions people might have on how I could approach this problem...


  [1]: https://stackoverflow.com/questions/3859109/integration-tests-with-mongodb

Embedded MongoDB when running integration tests

How do I get the timestamp from the MongoDB id?


Getting timestamp from mongodb id

MongoDB is fast, but only when your working set or index can fit into RAM. So if my server has 16G of RAM, does that mean the sizes of all my collections need to be less than or equal to 16G? How does one say &quot;ok this is my working set, the rest can be &quot;archived?&quot; 

Content Type	Original Author	Original Content on Stackoverflow
Question	Allyl Isocyanate	View Question on Stackoverflow
Solution 1 - Ruby on-Rails	Allyl Isocyanate	View Answer on Stackoverflow
Solution 2 - Ruby on-Rails	dima Ti	View Answer on Stackoverflow

Using Active Record generators after Mongoid installation?

Ruby on-Rails Problem Overview

Ruby on-Rails Solutions

Solution 1 - Ruby on-Rails

Solution 2 - Ruby on-Rails

Phone number validation Android

Scala: “any” and “all” functions

Attributions