Help with pagination


#1

I’m trying to follow the Agile Web D. example, and do
pagination.

I have a model SearchTerm, and another model Listing

Here’s SearchTerm

class SearchTerm < ActiveRecord::Base
has_many :listings
end

In my admin controller, if I do this

def show
@search_term = SearchTerm.find(params[:id])
end

Then, with a given id related to a search term, in a view, I can
iterate through listings that are related to a given search term id,
like this:

<% @search_term.listings.undeleted.each do |listing| %>

<%= listing.title %>
<% end %>

But I can’t figure out how to paginate these listings. The Agile Web
Development example uses one table with no parent table. If I do this
in my admin controller:

def list
@listing_pages, @listings = paginate :listings, :per_page => 25
end

I can have a list.rhtml view, with this

<% for listing in @listings %>
<%= listing.title %>
<% end %>

Then if I navigate to http://0.0.0.0:3000/admin/list

I certainly get a paginated list of 25 listings, but of course they
are not related to a given search term id, in my search_terms table.
It just starts with the first listing in the listings table, and gives
the first 25.

How do I hook up pagination to the parent table?

Charlie


#2

removed_email_address@domain.invalid wrote:

How do I hook up pagination to the parent table?

Charlie

def list
@search_term = SearchTerm.find(params[:id])
@listing_pages, @listings = paginate :listings, { :per_page => 25,
:conditions => [ ‘search_term_id = ?’, @search_term.id ] }
end

That should do the trick. You can check out other options in the API
docs…
http://api.rubyonrails.org/classes/ActionController/Pagination.html#M000130

You can of course ommit the whole SearchTerm.find step, and put the
params[:id] straight into the :conditions option.

A lot of people will tell you the default pagination is a little slow in
the performance stakes, I tend to agree. Eventually you will find
yourself rolling your own, it works out a lot better in the long run.


#3

Works, thanks!

On May 29, 4:59 pm, Douglas S. removed_email_address@domain.invalid


#4

Charlie,

I posted a long how-to-paginate article that might help you.

http://www.nullislove.com/2007/05/24/pagination-in-rails/

Best,
Kevin S.