Rails 3 help double rendering

I get an error in view that says that I cannot double render.

My controller:

def index
    @title = 'asdsadas'
    @kategoris = Tag.all
    render 'admin/kategoris/index'
    respond_to do |format|
    format.html
    format.json { render :json => @kategoris }
    end

end

How should I rewrite my action, to 开发者_如何学运维not double rendering?

def index
    @title = 'asdsadas'
    @kategoris = Tag.all

    respond_to do |format|
    format.html { render 'admin/kategoris/index' }
    format.json { render :json => @kategoris }
    end

end