If you have this problem when you update your FreeBSD Ports:

===>>> Launching child to update ruby19-iconv-1.9.3.547,1 to ruby20-iconv-2.0.0.576,1

===>>> All >> ruby19-iconv-1.9.3.547,1 (17/17)

===>>> Currently installed version: ruby19-iconv-1.9.3.547,1
===>>> Port directory: /usr/ports/converters/ruby-iconv

	===>>> This port is marked IGNORE
	===>>> Not needed with Ruby 2.0 or newer


	===>>> If you are sure you can build it, remove the
	       IGNORE line in the Makefile and try again.

===>>> Update for ruby19-iconv-1.9.3.547,1 f...

The asset pipeline changes the paths of CSS files during precompilation. This opens a world of pain when CSS files reference images (like jQuery UI) or fonts (like webfont kits from Font Squirrel), since all those url(images/icon.png) will now point to a broken path.

In the past we have been using the vendor/asset-libs folder ...

JavaScript's NaN ("Not a Number") is hard to compare against. It never equals anything, not even itself:

NaN === NaN;        // false
Number.NaN === NaN; // false

There is the isNaN method, but it is not really what you are looking for:

isNaN(NaN)     // true
isNaN('hello') // true

Option 1: ES6

The Object.is() method determines whether two values are the same value. It even works for NaN:

Object.is(NaN, NaN) // true

Option 2: ES5

The example above shows that simply using isNaN would match other ...

Angular-xeditable is a bundle of AngularJS directives that allows you to create editable elements.

Such technique is also known as click-to-edit or edit-in-place.

It is based on ideas of x-editable but was written from scratch to use power of angular and support complex forms / editable grids.

Simply use one(...) instead of on(...). It takes the same arguments.

bower-rails is a great solution for managing vendored assets in your Rails app. It feels especially much more convenient and easier to update assets when going this way.

bower-rails generates a Bowerfile that works much like the Gemfile you're used to. Just specify your dependencies and run rake bower:install. You can find available packages here.

An example Bowerfile:

# ./Bowerfile
asset 'angular'
asset 'angular-i18n'
asset 'angular-ui-router'
asset 'angu...

JavaScript structures that include circular references can't be serialized with a"plain" JSON.stringify. Example:

a = { name: 'Groucho' };
b = { name: 'Harpo', sibling: a };
a.sibling = b;

Doing a JSON.stringify(a) will throw an error:

TypeError: Converting circular structure to JSON

There is not much you can do about that except specifying a custom serializer function that detects and cleans up circular references. There are existing solutions so you do not need to think of one yourself, like <https://githu...

Returning an empty scope can come in handy, e.g. as a default object. In Rails 4 you can achieve this by calling none on your ActiveRecord model.

    MyModel.none # returns an empty ActiveRecord::Relation object

For older Rails versions you can use the attached initializer to get a none scope.

We upgraded a Rails 2 application to Rails 3.2 and Ruby 2.1, changed the mysql adapter from mysql to mysql2, but did not activitate the asset pipeline. Instead we used Sass the old-school way (stylesheets in public/sass/*.sass) and relied on stylesheet_link_tag to activate the Sass compiler.

Now all Sass-generated stylesheets inserted the following text into body:before:

Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT

I could get rid of this by removing all generated .css files in `...

p ActiveRecord::Base.connection.indexes(:table_name)

This may be hard to find in the docs, but if you want CoffeeScript classes that instantiate their properties from a hash of attributes (like ActiveRecord), do it like this:

class User
  constructor: ({ @name, @email }) ->
    # empty contstructor is fine, CoffeeScript will do the magic.

Example:

var batman = new User(name: 'Bruce Wayne', email: 'batman@example.com')
batman.name # => 'Bruce Wayne'

This is what worked for me in a Rails 4:

# JSON data as first argument, then parameters
patch :update, { some: 'data' }.to_json, id: id, format: :json

Modern browsers natively suppport file pickers that allow the user to choose multiple files at once. To activate this feature, set the multiple attribute:

<input type="file" name="images[]" multiple />

Or in a Rails view:

<%= file_field_tag "images[]", multiple: true %>

This works in IE10+.

Make sure that the field name ends in [] so your server-side code will parse the incoming files into an array. Obviously this naming convention is not compatible with default Rails nested attribute setters, so you'll need to write a form ...

A collection of useful filters for AngularJS, e.g. for fuzzy string searching, displaying numbers as percentages an more.

Usage:

class Document < ActiveRecord::Base
  scope :any_tags, -> (tags){ where('tags && ARRAY[?]', tags) }
  scope :all_tags, -> (tags){ where('tags @> ARRAY[?]', tags) }
end

Document.create(title: "PostgreSQL", tags: ["pg","rails"])

Document.any_tags('pg')
Document.all_tags(['pg', 'rails'])

Migration:

class CreateDocuments < ActiveRecord::Migration
  def change
    create_table :documents do |t|
      t.string :title
      t.string :tags, array: true, default: []
      t.timestamps
    end
    add_index  :documents, :ta...

tl;dr: Use with_index

ActiveRecord's find_each with index

If you do not provide a block to find_each, it will return an Enumerator for chaining with other methods:

Person.find_each.with_index do |person, index|
  person.award_trophy(index + 1)
end

Ruby's map with index

Similarly, you may need an index when using other methods, like map, flat_map, detect (when you need the index for detection), or similar. Here is an example for map:

people...

A different take on what we're doing with ActiveType. Since it lives under the rails organization it might be part of Rails 5?

Nice tutorial about packaging Ruby bindings to your API in a Ruby gem, with tests using VCR casettes.

In Thunderbird, you can set custom font faces and sizes for reading plain-text e-mails. However, Thunderbird sometimes "randomly" does not respect your choices.

This is actually not a bug, but a rather weird feature: Fonts are defined per encoding of e-mails.

Some e-mails will be considered Unicode, some Western (ISO 8859-1), and some maybe yet another encoding.

The advanced font settings dialog by default just opens on "Western". Choose a different encoding from the "Fonts for" dropdown menu and you'll see that your custom font sett...

You need to copy an entire website? Use wget like this:

wget -kr http://host.tld/

This will fetch all content (-r for recursive) and rewrite links inside the documents to make them suitable for local viewing (-k).

If you're using the :header_html option in PDFKit (or the corresponding --header-html option in wkhtmltopdf), and the header remains invisible, you need to add this to your header HTML:

<!doctype html>

The same applies to footers via footer_html

I'm sorry.

To avoid n+1 queries, you want to eager-load associated records if you know you need to access them later on.

The Rails docs say:

Eager loading is supported with polymorphic associations.

This is true, but has some caveats.

Example

Consider the following models:

class Image < ActiveRecord::Base; end

class Video < ActiveRecord::Base; end

class PageVersion < ActiveRecord::Base
  belongs_to :primary_medium, polymorphic: true # may be Image or Video
end

class Page < ActiveRecord::Base
  belongs_to ...

So you want to organize your I18n using multiple .yml files but your Rails 4.1 application simply won't use any extra files in development? Spring is to blame.

Halt spring by running:

spring stop

The next time you spawn a bin/rails console or similar, your new translations will work.

You will need to repeat the above every time you create a new .yml file or rename existing ones.
:(

Great introduction to React.js and the ideas behind it.