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doc/Elephas/Backends/RubyOnRails.html

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  Class: Elephas::Backends::RubyOnRails
  
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    <div id="content"><h1>Class: Elephas::Backends::RubyOnRails
  
  
  
</h1>

<dl class="box">
  
    <dt class="r1">Inherits:</dt>
    <dd class="r1">
      <span class="inheritName"><span class='object_link'><a href="Base.html" title="Elephas::Backends::Base (class)">Base</a></span></span>
      
        <ul class="fullTree">
          <li>Object</li>
          
            <li class="next"><span class='object_link'><a href="Base.html" title="Elephas::Backends::Base (class)">Base</a></span></li>
          
            <li class="next">Elephas::Backends::RubyOnRails</li>
          
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    <dt class="r2 last">Defined in:</dt>
    <dd class="r2 last">lib/elephas/backends/ruby_on_rails.rb</dd>
  
</dl>
<div class="clear"></div>

<h2>Overview</h2><div class="docstring">
  <div class="discussion">
    <p>This is a Ruby on Rails backend, which uses Rails.cache.</p>


  </div>
</div>
<div class="tags">
  

</div>






  
    <h2>
      Instance Method Summary
      <small>(<a href="#" class="summary_toggle">collapse</a>)</small>
    </h2>

    <ul class="summary">
      
        <li class="public ">
  <span class="summary_signature">
    
      <a href="#delete-instance_method" title="#delete (instance method)">- (Boolean) <strong>delete</strong>(key) </a>
    

    
  </span>
  
  
  
  
  
  
  

  
    <span class="summary_desc"><div class='inline'><p>Deletes a value from the cache.</p>
</div></span>
  
</li>

      
        <li class="public ">
  <span class="summary_signature">
    
      <a href="#exists%3F-instance_method" title="#exists? (instance method)">- (Boolean) <strong>exists?</strong>(key) </a>
    

    
  </span>
  
  
  
  
  
  
  

  
    <span class="summary_desc"><div class='inline'><p>Checks if a key exists in the cache.</p>
</div></span>
  
</li>

      
        <li class="public ">
  <span class="summary_signature">
    
      <a href="#read-instance_method" title="#read (instance method)">- (Entry|NilClass) <strong>read</strong>(key) </a>
    

    
  </span>
  
  
  
  
  
  
  

  
    <span class="summary_desc"><div class='inline'><p>Reads a value from the cache.</p>
</div></span>
  
</li>

      
        <li class="public ">
  <span class="summary_signature">
    
      <a href="#write-instance_method" title="#write (instance method)">- (Object) <strong>write</strong>(key, value, options = {}) </a>
    

    
  </span>
  
  
  
  
  
  
  

  
    <span class="summary_desc"><div class='inline'><p>Writes a value to the cache.</p>
</div></span>
  
</li>

      
    </ul>
  


  
  
  
  
  
  
  
  
  <h3 class="inherited">Methods inherited from <span class='object_link'><a href="Base.html" title="Elephas::Backends::Base (class)">Base</a></span></h3>
  <p class="inherited"><span class='object_link'><a href="Base.html#now-instance_method" title="Elephas::Backends::Base#now (method)">#now</a></span></p>

  

  <div id="instance_method_details" class="method_details_list">
    <h2>Instance Method Details</h2>

    
      <div class="method_details first">
  <h3 class="signature first" id="delete-instance_method">
  
    - (<tt>Boolean</tt>) <strong>delete</strong>(key) 
  

  

  
</h3><div class="docstring">
  <div class="discussion">
    <p>Deletes a value from the cache.</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>key</span>
      
      
        <span class='type'>(<tt>String</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The key to delete.</p>
</div>
      
    </li>
  
</ul>

<p class="tag_title">Returns:</p>
<ul class="return">
  
    <li>
      
      
        <span class='type'>(<tt>Boolean</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p><code>true</code> if the key was in the cache, <code>false</code> otherwise.</p>
</div>
      
    </li>
  
</ul>

</div><table class="source_code">
  <tr>
    <td>
      <pre class="lines">


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    </td>
    <td>
      <pre class="code"><span class="info file"># File 'lib/elephas/backends/ruby_on_rails.rb', line 37</span>

<span class='kw'>def</span> <span class='id identifier rubyid_delete'>delete</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_rv'>rv</span> <span class='op'>=</span> <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_exist?'>exist?</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
  <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_delete'>delete</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_rv'>rv</span>
<span class='kw'>end</span></pre>
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</div>
    
      <div class="method_details ">
  <h3 class="signature " id="exists?-instance_method">
  
    - (<tt>Boolean</tt>) <strong>exists?</strong>(key) 
  

  

  
</h3><div class="docstring">
  <div class="discussion">
    <p>Checks if a key exists in the cache.</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>key</span>
      
      
        <span class='type'>(<tt>String</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The key to lookup.</p>
</div>
      
    </li>
  
</ul>

<p class="tag_title">Returns:</p>
<ul class="return">
  
    <li>
      
      
        <span class='type'>(<tt>Boolean</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p><code>true</code> if the key is in the cache, <code>false</code> otherwise.</p>
</div>
      
    </li>
  
</ul>

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    </td>
    <td>
      <pre class="code"><span class="info file"># File 'lib/elephas/backends/ruby_on_rails.rb', line 47</span>

<span class='kw'>def</span> <span class='id identifier rubyid_exists?'>exists?</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
  <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_exist?'>exist?</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span> <span class='op'>&amp;&amp;</span> <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_read'>read</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span><span class='period'>.</span><span class='id identifier rubyid_valid?'>valid?</span><span class='lparen'>(</span><span class='kw'>self</span><span class='rparen'>)</span>
<span class='kw'>end</span></pre>
    </td>
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      <div class="method_details ">
  <h3 class="signature " id="read-instance_method">
  
    - (<tt><span class='object_link'><a href="../Entry.html" title="Elephas::Entry (class)">Entry</a></span>|NilClass</tt>) <strong>read</strong>(key) 
  

  

  
</h3><div class="docstring">
  <div class="discussion">
    <p>Reads a value from the cache.</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>key</span>
      
      
        <span class='type'>(<tt>String</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The key to lookup.</p>
</div>
      
    </li>
  
</ul>

<p class="tag_title">Returns:</p>
<ul class="return">
  
    <li>
      
      
        <span class='type'>(<tt><span class='object_link'><a href="../Entry.html" title="Elephas::Entry (class)">Entry</a></span>|NilClass</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The read value or <code>nil</code>.</p>
</div>
      
    </li>
  
</ul>

</div><table class="source_code">
  <tr>
    <td>
      <pre class="lines">


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    </td>
    <td>
      <pre class="code"><span class="info file"># File 'lib/elephas/backends/ruby_on_rails.rb', line 15</span>

<span class='kw'>def</span> <span class='id identifier rubyid_read'>read</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_exists?'>exists?</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span> <span class='op'>?</span> <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_read'>read</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span> <span class='op'>:</span> <span class='kw'>nil</span>
<span class='kw'>end</span></pre>
    </td>
  </tr>
</table>
</div>
    
      <div class="method_details ">
  <h3 class="signature " id="write-instance_method">
  
    - (<tt>Object</tt>) <strong>write</strong>(key, value, options = {}) 
  

  

  
</h3><div class="docstring">
  <div class="discussion">
    <p>Writes a value to the cache.</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>key</span>
      
      
        <span class='type'>(<tt>String</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The key to associate the value with.</p>
</div>
      
    </li>
  
    <li>
      
        <span class='name'>value</span>
      
      
        <span class='type'>(<tt>Object</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The value to write. <strong>Setting a value to <code>nil</code> **doesn’t</strong> mean <em>deleting</em> the value.</p>
</div>
      
    </li>
  
    <li>
      
        <span class='name'>options</span>
      
      
        <span class='type'>(<tt><span class='object_link'><a href="Hash.html" title="Elephas::Backends::Hash (class)">Hash</a></span></tt>)</span>
      
      
        <em class="default">(defaults to: <tt>{}</tt>)</em>
      
      
        &mdash;
        <div class='inline'><p>A list of options for writing.</p>
</div>
      
    </li>
  
</ul>

<p class="tag_title">Returns:</p>
<ul class="return">
  
    <li>
      
      
        <span class='type'>(<tt>Object</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'><p>The value itself.</p>
</div>
      
    </li>
  
</ul>

  <p class="tag_title">See Also:</p>
  <ul class="see">
    
      <li>Cache.setup_options</li>
    
  </ul>

</div><table class="source_code">
  <tr>
    <td>
      <pre class="lines">


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    </td>
    <td>
      <pre class="code"><span class="info file"># File 'lib/elephas/backends/ruby_on_rails.rb', line 26</span>

<span class='kw'>def</span> <span class='id identifier rubyid_write'>write</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span><span class='comma'>,</span> <span class='id identifier rubyid_options'>options</span> <span class='op'>=</span> <span class='lbrace'>{</span><span class='rbrace'>}</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_entry'>entry</span> <span class='op'>=</span> <span class='op'>::</span><span class='const'>Elephas</span><span class='op'>::</span><span class='const'>Entry</span><span class='period'>.</span><span class='id identifier rubyid_ensure'>ensure</span><span class='lparen'>(</span><span class='id identifier rubyid_value'>value</span><span class='comma'>,</span> <span class='id identifier rubyid_key'>key</span><span class='comma'>,</span> <span class='id identifier rubyid_options'>options</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_entry'>entry</span><span class='period'>.</span><span class='id identifier rubyid_refresh'>refresh</span>
  <span class='const'>Rails</span><span class='period'>.</span><span class='id identifier rubyid_cache'>cache</span><span class='period'>.</span><span class='id identifier rubyid_write'>write</span><span class='lparen'>(</span><span class='id identifier rubyid_key'>key</span><span class='comma'>,</span> <span class='id identifier rubyid_entry'>entry</span><span class='comma'>,</span> <span class='label'>expires_in:</span> <span class='id identifier rubyid_entry'>entry</span><span class='period'>.</span><span class='id identifier rubyid_ttl'>ttl</span><span class='rparen'>)</span>
  <span class='id identifier rubyid_entry'>entry</span>
<span class='kw'>end</span></pre>
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