Pastable version of Merging two sets of conditions

<pre class='prettyprint' language='ruby'># Merges two sets of condition options for ActiveRecord::Base find calls
def merge_conditions(base_conditions, new_conditions, boolean_operator=&quot;AND&quot;)
  return base_conditions if new_conditions.blank?
  return new_conditions  if base_conditions.blank?
  
  case base_conditions
  when Hash
    case new_conditions
    when Hash
      base_conditions.merge(new_conditions)
    else
      raise &quot;Hash conditions can only be merged with other hash conditions&quot;
    end
  when Array
    case new_conditions
    when Array
      [&quot;#{base_conditions[0]} #{boolean_operator} #{new_conditions[0]}&quot;, base_conditions[1..-1], new_conditions[1..-1]].flatten
    when String
      conditions = base_conditions.dup
      conditions[0] = &quot;#{base_conditions[0]} #{boolean_operator} #{new_conditions}&quot;
      conditions
    else
      raise &quot;Array conditions can only be merged with array or string conditions&quot;
    end
  when String
    case new_conditions
    when String
      &quot;#{base_conditions} #{boolean_operator} #{new_conditions}&quot;
    when Array
      conditions = new_conditions.dup
      conditions[0] = &quot;#{base_conditions} #{boolean_operator} #{new_conditions[0]}&quot;
      conditions
    else
      raise &quot;String conditions can only be merged with string or array conditions&quot;
    end
  end
end</pre>
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Pastable version of Merging two sets of conditions