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This is <a href="."><em>Devhints.io cheatsheets</em></a> &mdash; a collection of cheatsheets I've written.
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<h1><span>i18n</span></h1>
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<pre class="light"><code class="language-rb">t('my.messages.hello')
# same as 'my.messages.hello'
t(:hello, scope: 'my.messages')
t(:hello, scope: [:my, :messages])
t('my.messages.hello', default: "Hello")
</code></pre>
<pre><code class="language-yml">en:
my:
messages:
hello: "Hello"
</code></pre>
<h3 id="interpolation">Interpolation</h3>
<pre class="light"><code class="language-rb">t('hello', name: "John")
</code></pre>
<pre><code class="language-yml">hello: "Hello %{name}"
</code></pre>
<h3 id="lazy-lookup">Lazy lookup</h3>
<pre class="light"><code class="language-rb"># from the 'books/index' view
t('.title')
</code></pre>
<pre><code class="language-yml">en:
books:
index:
title: "Título"
</code></pre>
<h3 id="plural">Plural</h3>
<pre class="light"><code class="language-rb">t(:inbox, count: 1) #=&gt; 'one message'
t(:inbox, count: 2) #=&gt; '2 messages'
</code></pre>
<pre><code class="language-yml">inbox:
one: 'one message',
other: '%{count} messages'
</code></pre>
<h2 id="localizing">Localizing</h2>
<h3 id="time">Time</h3>
<pre class="light"><code class="language-rb">l(Time.now)
l(Time.now, format: :short)
</code></pre>
<pre><code class="language-yml">en:
time:
formats:
default: "%a, %d %b %Y %H:%M:%S %z"
long: "%B %d, %Y %H:%M"
short: "%d %b %H:%M"
</code></pre>
<h3 id="date">Date</h3>
<pre class="light"><code class="language-rb">l(Date.today)
</code></pre>
<pre><code class="language-yml">en:
date:
formats:
default: "%Y-%m-%d" # 2015-06-25
long: "%B %d, %Y" # June 25, 2015
short: "%b %d" # Jun 25
</code></pre>
<h2 id="activerecord">ActiveRecord</h2>
<h3 id="model-names">Model names</h3>
<pre class="light"><code class="language-rb">User.model_name.human #=&gt; "User"
Child.model_name.human(count: 2) #=&gt; "Children"
</code></pre>
<pre><code class="language-yml">en:
activerecord:
models:
user: "User"
child:
one: "Child"
other: "Children"
</code></pre>
<h3 id="attributes">Attributes</h3>
<pre class="light"><code class="language-rb">User.human_attribute_for :name #=&gt; "Name"
</code></pre>
<pre><code class="language-yml">en:
activerecord:
attributes:
user:
# activerecord.attributes.&lt;model&gt;.&lt;field&gt;
name: "Name"
email: "Email"
</code></pre>
<h3 id="error-messages">Error messages</h3>
<pre class="light"><code class="language-rb">error_messages_for(...)
</code></pre>
<pre><code class="language-yml">activerecord:
errors:
models:
venue:
attributes:
name:
blank: "Please enter a name."
</code></pre>
<p>Possible scopes (in order):</p>
<pre><code class="language-yml">activerecord.errors.models.[model_name].attributes.[attribute_name].[error]
activerecord.errors.models.[model_name].[error]
activerecord.errors.messages.[error]
errors.attributes.[attribute_name].[error]
errors.messages.[error]
</code></pre>
<p>Where <code>[error]</code> can be:</p>
<pre><code class="language-yml">validates
confirmation - :confirmation
acceptance - :accepted
presence - :blank
length - :too_short (%{count})
length - :too_long (%{count})
length - :wrong_length (%{count})
uniqueness - :taken
format - :invalid
numericality - :not_a_number
</code></pre>
<h3 id="form-labels">Form labels</h3>
<pre class="light"><code class="language-rb">form_for @post do
f.label :body
</code></pre>
<pre><code class="language-yml">helpers:
# helpers.label.&lt;model&gt;.&lt;field&gt;
label:
post:
body: "Your body text"
</code></pre>
<h3 id="submit-buttons">Submit buttons</h3>
<pre class="light"><code class="language-rb">form_for @post do
f.submit
</code></pre>
<pre><code class="language-yml">helpers:
submit:
# helpers.submit.&lt;action&gt;
create: "Create a %{model}"
update: "Confirm changes to %{model}"
# helpers.submit.&lt;model&gt;.&lt;action&gt;
article:
create: "Publish article"
update: "Update article"
</code></pre>
<h2 id="numbers">Numbers</h2>
<pre class="light"><code class="language-rb">number_to_delimited(2000) #=&gt; "2,000"
number_to_currency(12.3) #=&gt; "$12.30"
number_to_percentage(0.3) #=&gt; "30%"
number_to_rounded(3.14, precision: 0) #=&gt; "3"
number_to_human(12_000) #=&gt; "12 Thousand"
number_to_human_size(12345) #=&gt; "12.3 kb"
</code></pre>
<h3 id="delimited">Delimited</h3>
<pre class="light"><code class="language-rb">number_to_delimited(n)
</code></pre>
<pre><code class="language-yml">number:
format:
separator: '.'
delimiter: ','
precision: 3
significant: false
strip_insignificant_zeroes: false
</code></pre>
<h3 id="currencies">Currencies</h3>
<pre class="light"><code class="language-rb">number_to_currency(n)
</code></pre>
<pre><code class="language-yml">number:
currency:
format:
format: "%u%n" # %u = unit, %n = number
unit: "$"
separator: '.'
delimiter: ','
precision: 3
# (see number.format)
</code></pre>
<h3 id="percentage">Percentage</h3>
<pre class="light"><code class="language-rb">number_to_percentage(n)
</code></pre>
<pre><code class="language-yml">number:
percentage:
format:
format: "%n%"
# (see number.format)
</code></pre>
<h2 id="programmatic-access">Programmatic access</h2>
<pre class="light"><code class="language-rb">I18n.backend.store_translations :en, ok: "Ok"
I18n.locale = :en
I18n.default_locale = :en
I18n.available_locales
I18n.translate :ok # aka, I18n.t
I18n.localize date # aka, I18n.l
</code></pre>
<h2 id="reference">Reference</h2>
<ul>
<li>http://guides.rubyonrails.org/i18n.html</li>
<li>http://rails-i18n.org/wiki</li>
<li>https://github.com/svenfuchs/i18n</li>
<li>https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/en.yml</li>
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<strong><a href=".">Devhints.io cheatsheets</a></strong> is a collection of cheatsheets I've written over the years.
Suggestions and corrections? <a href='https://github.com/rstacruz/cheatsheets/issues/907'>Send them in</a>.
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I'm <a href="http://ricostacruz.com">Rico Sta. Cruz</a>.
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