`Why does the error occur: "undefined method `[]' for nil:NilClass"
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<div class="content__item-top-div"> <a class="content__item-top-name" href="#!">Anton</a><span class="content__item-top-p">2016-07-16 12:17:24</span></div>
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<div class="content__item-row dn"> <a href="#!"><b>Anton</b>,</a> 2016-07-16 12:17:24</div>
<p class="content__item-title large">Why does the error occur: "undefined method `[]' for nil:NilClass"?</p>
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There is a field_pattern helper. In the vase I write:<br><pre><code class="ruby hljs">field_pattern <span class="hljs-symbol">validation:</span> {<span class="hljs-symbol">type:</span> <span class="hljs-string">'length'</span>, <span class="hljs-symbol">length:</span> <span class="hljs-string">'50-200'</span>}</code></pre><br>
And this is the helper code.<br><pre><code class="ruby hljs"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">field_pattern</span> <span class="hljs-title">data</span></span>
validation = data[<span class="hljs-symbol">:validation</span>]
validation
<span class="hljs-keyword">end</span></code></pre><br>
I get:<br><blockquote>{:type=>"length", :length=>"3-100"}</blockquote><br>
I write:
I receive:<br><code class="ruby hljs">validation[<span class="hljs-symbol">:type</span>] <span class="hljs-comment"># или validation[:length]</span></code><br><blockquote>undefined method `[]' for nil:NilClass</blockquote><br>
I write:
I receive:<br><code class="ruby hljs">validation.<span class="hljs-keyword">class</span></code><br><blockquote>Hash</blockquote><br>
Where did I sin?
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<div class="content__item-img large name-color-V"><span>V</span></div><span class="answer__name"><a href="#!">vsuhachev</a>, 2016-07-17 <br/> @vsuhachev</span>
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<p class="answer__detail">validation is a local variable inside the field_pattern function, it is not visible outside this function, which does not exclude the fact that you have some other variable / function with the same name in the scope in which you call the code that falls with an error</p>
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<div class="content__item-img large name-color-V"><span>V</span></div><span class="answer__name"><a href="#!">vadimstroganov</a>, 2016-07-18 <br/> @vadimstroganov</span>
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<p class="answer__detail"><pre><code class="hljs">def field_pattern data
validation = data[:validation]
validation
end
v = field_pattern validation: {type: 'length', length: '50-200'}
v[:type] # "length"
v[:length] # "50-200"</code></pre><br>
Or make the validation variable global:<br><pre><code class="hljs">def field_pattern data
$validation = data[:validation]
$validation
end
$validation[:type] # "length"
$validation[:length] # "50-200"</code></pre></p>
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