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December 20, 2015 16:48
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concatenate filters and and ordering
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| @categories = Categories.page params[:page] | |
| @categories = @categories.order(params[:order_field] => params[:order_direction) unless params[:order_field].blank? || params[:order_direction].blank? | |
| @categories = @categories.where(:attr1 => params[:p1]) unless params[:p1].blank? # (n times) |
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