I want the current user to read and purchase postings in clubs in which he is a member. I would love to do something like the following, but nothing I've read or tried has clicked yet. I will be using many nesting collections of this type, I'm stuck!

Models

    class User < ActiveRecord::Base
        has_many :memberships
        has_many :clubs, :through => :memberships
        has_many :products

    class Membership < ActiveRecord::Base
        belongs_to :user
        belongs_to :club

    class Club < ActiveRecord::Base
        has_many :memberships
        has_many :users, :through => :memberships
        has_many :events

   class Event < ActiveRecord::Base
        belongs_to :club

   class Product < ActiveRecord::Base
        belongs_to :user
        has_many :posts

   class Post < ActiveRecord::Base
        belongs_to :product
        belongs_to :event

Posts Controller

def index
   @user = current_user
   @posts_in_my_clubs = @user.memberships.collect { |a| a.products.posts}

posts/index.html.erb

@posts_in_my_clubs do |post|

Gives me the error:

undefined method `memberships' for nil:NilClass

To which I am not surprised. Additionally I want to be able to select only the posts that will be only at a certain event, etc.

A summary of the models: Clubs have many Events & Users. Users have many Products to which they can Post a quantity to sell at different Event dates. Only Users who are members of a Club can post or view posts in a Club.

Instead of repeating data in the models, I have made associations, which seem to make the data inaccessible to creating collections in ActiveRecord. I've found in my research Association Join Models, and Intelligent association mapping with metawhere. These links make me feel like I'm getting close.

Edit

I'm signed in and can access all of the data I need as long as I'm not trying to do a collection like this. For instance I can check if I'm a member of the club by

def member?(club) 
   return !!self.clubs.find(club)

I am a noob, so I must be missing something obvious here. Do I need to break up my collection into steps? i.e. collect开发者_如何学Go user clubs, collect user clubs products, collect user clubs products posts... thanks

Logger.info

    @user = current_user
    logger.info @user 
    logger.info 'super secret message'
   # @club_posts = @user.memberships.collect {|a| a.product.posts}

returns

#<User:0x5b202a0>
super secret message

When I remove the comment, I get the nil error again, for 'product' now (progress!). I sure thought I was logged in before.. tho it was late

That error message means that current_user is nil. Are you sure your authentication system is working?

Here is the solution I found, using gem nested_has_many_through, which is standard in Rails 3.1

User model

  has_many :products, :dependent => :destroy
  has_many :orders, :dependent => :destroy
  has_many :product_posts, :through => :products, :source => :posts, :uniq => true
  has_many :food_orders, :through => :product_posts, :source => :orders, :uniq => true

OrdersController

 @orders_for_my_products = current_user.food_orders.all

Orders index

<%= render :partial => "order", :collection => @for_my_products, :locals => {:order => @order}  %>

This returns the deep nested data via relationships using minimal code. I sure hope its efficient, but at least my sanity is spared!