> You mean to say i need to add
> 1)map.resources :articles, :collection => [:search] in route.rb

yes

> 2)do i need to add method in controller like
>
> def get
> -----
> end

no, it should be:
def search
...
end

the :collection => [:search]
declares the existence of this search method in the articles
controller

>
> 3)Can we give the tag parameter as text box entry from the
> forms(index.html.erb) and that tag parameter can be searched in the
> database?
>

yes, if you have a textbox named "search", then
params[:search]
will have the text entered in this box. You
can give it any other name of course, params will have the value
with the same name.
(You can see what params are returned in the development.log)

To use this for searching:
@articles = Article.find_tagged_with(params[:search])

then you should have all artcles with that tag in @articles
and can display them in the view

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