But there is one problem, it display this problem: undefined method
`render_component' for #<#<Class:0xb67e6e48>:0xb67e5f34>
How can I resolve this problem?
IIRC, components have been deprecated since 2.0. There may be a gem or plugin
to provide backwards compatibility (that may not have been updated for Rails
3). But, if it were me, I'd update to more modern idioms.