Named Scope Problem With "Has Many Through" Association - ruby-on-rails

Question

I'm using named scopes to process some filtering actions, and the log is showing that everything is working perfectly, except that after the app goes and finds the correct data, it then ignores what it found and just lists a find.all instead of the filtered result. Here's the details.
I have 3 models: Users, Markets and Schedules.
User has_many :schedules
User has_many :markets, :through => :schedules
Market has_many :schedules
Market has_many :users, :through => :schedules
Schedule belongs_to :user
Schedule belongs_to :market
On the "show" page for each market, I display the users who sell things at that market. I also display the days of the week that such users are at the market. This data is contained in the join model (i.e. schedules).
On the market page, I need to support filtering the users by day of the week that the user is at the market.
In my Market controller, I have this:
def show
#market = Market.find(params[:id])
#users = #market.users.filter_marketdate(params[:filter])
end
In my Market model, I have this:
def self.filter_marketdate(filter)
case filter
when 'monday' then monday.all
else find(:all)
end
end
In my User model, I have this:
named_scope :monday, :include => :schedules, :conditions => {'schedules.monday' => true }
AND
def self.filter_marketdate(filter)
case filter
when 'monday' then monday.all
else find(:all)
end
end
In my show view for Markets, I have this:
<%= link_to_unless_current "All", :filter => 'all' %>
<%= link_to_unless_current "Mon", :filter => 'monday' %>
<% #market.schedules.each do |c| %>
<%= link_to c.user.name, c.user %>
<% end %>
Here's the weird part. The following is my log output when I select the Monday filter. If you look at the Select Schedules line of the output, you can see that the query is finding a limited number of user IDs. These are, in fact, the correct user IDs that I want to display for my filtered query. The part I don't understand is that after the app does the query perfectly, it then goes and loads all of the users instead of just the filtered results. I'm not sure what I'm missing.
Processing MarketsController#show (for ip at 2009-09-21 05:19:25) [GET]
Parameters: {"id"=>"1", "filter"=>"monday"}
Market Load (0.8ms) SELECT * FROM "markets" WHERE ("markets"."id" = 1)
User Load (7.3ms) SELECT "users".* FROM "users" INNER JOIN "schedules" ON "users".id = "schedules".user_id WHERE ((("schedules".market_id = 1)) AND ("schedules"."monday" = 't'))
Schedule Load (4.3ms) SELECT "schedules".* FROM "schedules" WHERE ("schedules".user_id IN (16,23,25,30,39,61,73,75,85,95,97,111,112,116,121,123,126,134,136,145,160,165,171,188,189))
Rendering template within layouts/application
Rendering markets/show
Schedule Load (14.3ms) SELECT * FROM "schedules" WHERE ("schedules".market_id = 1)
User Load (0.8ms) SELECT * FROM "users" WHERE ("users"."id" = 2)
User Load (0.8ms) SELECT * FROM "users" WHERE ("users"."id" = 8)
It goes on to list every user who is connected to this particular market, essentially doing a find.all.
UPDATE
In response to Brad's comment below, I tried changing the code in my markets/show view to the following, but I got the same result. I agree that the problem is in here somewhere, but I can't quite figure out how to solve it.
<%= link_to_unless_current "All", :filter => 'all' %>
<%= link_to_unless_current "Mon", :filter => 'monday' %>
<% #market.users.each do |user| %>
<%= link_to user.name, user %>
<% end %>

Answer 1

In your view, you are iterating over each market.schedule, not over the #users variable that you set. In fact, you aren't even using #users in the code you show us.

Answer 2

Shouldnt that be:
#Market.rb
has_many :users, :through => :schedules
Beside this, maybe this plugin helps you:
http://github.com/ntalbott/query_trace
It provides feedback for each sql statement and where it comes from..
f.e.:
Before:
Schedule Load (0.023687) SELECT * FROM schedules WHERE (schedules.id = 3) LIMIT 1
Resource Load (0.001076) SELECT * FROM resources WHERE (resources.id = 328) LIMIT 1
Schedule Load (0.011488) SELECT * FROM schedules WHERE (schedules.id = 3) LIMIT 1
Resource Load (0.022471) SELECT * FROM resources WHERE (resources.id = 328) LIMIT 1
After:
Schedule Load (0.023687) SELECT * FROM schedules WHERE (schedules.id = 3) LIMIT 1
app/models/available_work.rb:50:in `study_method'
app/helpers/plan_helper.rb:4:in `work_description'
app/views/plan/_resource_schedule.rhtml:27:in `_run_rhtml_plan__resource_schedule'
app/views/plan/_resource_schedule.rhtml:24:in `_run_rhtml_plan__resource_schedule'
app/views/plan/_schedule_listing.rhtml:5:in `_run_rhtml_plan__schedule_listing'
app/views/plan/_schedule_listing.rhtml:3:in `_run_rhtml_plan__schedule_listing'
app/views/plan/_schedule_listing.rhtml:1:in `_run_rhtml_plan__schedule_listing'
app/views/plan/index.rhtml:6:in `_run_rhtml_plan_index'
vendor/plugins/textmate_footnotes/lib/textmate_footnotes.rb:60:in `render'
Resource Load (0.001076) SELECT * FROM resources WHERE (resources.id = 328) LIMIT 1
app/models/available_work.rb:54:in `div_type'
app/helpers/plan_helper.rb:6:in `work_description'
app/views/plan/_resource_schedule.rhtml:27:in `_run_rhtml_plan__resource_schedule'
app/views/plan/_resource_schedule.rhtml:24:in `_run_rhtml_plan__resource_schedule'
app/views/plan/_schedule_listing.rhtml:5:in `_run_rhtml_plan__schedule_listing'
app/views/plan/_schedule_listing.rhtml:3:in `_run_rhtml_plan__schedule_listing'
app/views/plan/_schedule_listing.rhtml:1:in `_run_rhtml_plan__schedule_listing'
app/views/plan/index.rhtml:6:in `_run_rhtml_plan_index'
vendor/plugins/textmate_footnotes/lib/textmate_footnotes.rb:60:in `render'
UPDATE:
You have to call
<%= link_to_unless_current "All", :filter => 'all' %>
<%= link_to_unless_current "Mon", :filter => 'monday' %>
<% #users.each do |user| %>
<%= link_to user.name, user %>
<% end %>