I’m relatively new to Ruby on Rails, although not to programming in
general.
I’m attempting to make a sort of classified ad system. I’d like to
have a list of my categories with the number of ads in that category
next to it. For example:
Jobs - Carpenters (1)
Jobs - Electricians (10)
Jobs - IT (3)
etc.
I’ve created model, Category, and I’ve linked it to the Classifieds
model, using belongs_to: and has_many: tags.
My problem is that I’ve listed the categories and counts successfully,
but they’re repeating. Instead of the above, it looks more like this:
Jobs - Carpenters (1)
Jobs - Electricians (10)
Jobs - IT (3)
Jobs - Electricians (10)
Jobs - Electricians (10)
Jobs - IT (3)
It’s repeating because I’ve got the loop running in category.rb which
is called from the category_list.html.
Here’s the code from category.rb:
def self.count_categories
count(:id, :conditions => {:category_id => i})
end
My question is, how can I set it to display only the categories and
their counts without repeating?
i think your problem lies in the way you have arranged your relations.
You talk about Classifieds (Advert i assume), Category and Tag. Now
that is 2 namespaces for a single advert. Ie: One advert belongs to
one category and has many tags…
If we leave the tags alone for the time being, and you want a category
object holding many adverts and an advert belonging only to one
category, then you would do something like:
===category.rb
class Category < AR::Base
has_many :adverts
end
===advert.rb
class Advert < AR::Base
belongs_to :category
end
your adverts table needs a column :category_id, :integer
=== views/categories/index.rhtml
<%- for category in @categories- %>
Jobs - <%= category.name.upcase! %> ( <%= category.adverts.size
%> )
<%- end -%>
=== controllers/categories_controller.rb
def index @categories = Category.find(:all)
end
that should do it.
For the tags system, you will need to set up a many to many relation
9which can be of 2 types, has_and_belongs_to_many or
has_many :through, check this out if you’re unaware of them has_many :through - Many-to-many Dance-off! )
where an advert has many tags and a tag has many adverts. then you can
do things like: