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    <p>When the view is being rendered, instance variables and their values are picked up from the controller and passed to the view initializer which sets them to the view instance. This is done using these ruby methods:</p> <p><code>instance_variables</code> - gets names of instance variables (<a href="http://ruby-doc.org/core-2.0.0/Object.html#method-i-instance_variables">documentation</a>) <code>instance_variable_get(variable_name)</code> - gets value of an instance variable (<a href="http://ruby-doc.org/core-2.0.0/Object.html#method-i-instance_variable_get">documentation</a>) <code>instance_variable_set(variable_name, variable_value)</code> - sets value of an instance variable (<a href="http://ruby-doc.org/core-2.0.0/Object.html#method-i-instance_variable_set">documentation</a>)</p> <p>Here is the Rails code:</p> <p>Collecting controller instance variables (<a href="https://github.com/rails/rails/blob/0c5552a3dd28e35cce64462765cc41c5355db0f1/actionpack/lib/abstract_controller/rendering.rb#L138-L145">github</a>):</p> <pre><code>def view_assigns hash = {} variables = instance_variables variables -= protected_instance_variables variables -= DEFAULT_PROTECTED_INSTANCE_VARIABLES variables.each { |name| hash[name[1..-1]] = instance_variable_get(name) } hash end </code></pre> <p>Passing them to the view (<a href="https://github.com/rails/rails/blob/0c5552a3dd28e35cce64462765cc41c5355db0f1/actionpack/lib/abstract_controller/rendering.rb#L84-L86">github</a>):</p> <pre><code>def view_context view_context_class.new(view_renderer, view_assigns, self) end </code></pre> <p>Setting them in the view (<a href="https://github.com/rails/rails/blob/f817bb2c485d7363be104fd8a00b28c36a0adefc/actionpack/lib/action_view/base.rb#L177-L179">github</a>):</p> <pre><code>def assign(new_assigns) # :nodoc: @_assigns = new_assigns.each { |key, value| instance_variable_set("@#{key}", value) } end </code></pre>
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    1. POHow are Rails instance variables passed to views?
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    1. USmechanicalfish
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    1. COCould also enhance your answer with links to rails git repo?
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      1. USSergio Tulentsev
    2. CO@SergioTulentsev I added the links, thanks for the suggestion.
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    3. COBTW, you can hold down SHIFT when selecting lines on github. I've upgraded your links.
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