How to output a specific category in my view? - ruby

Question

i have a rails 3 blog application which has article and category "category belongs_to :article" Article has_many :category, now I have different category which have many article for instance sport category which contain all sport article, what i want in my application layout i want to show only sport article in on div please tell me how to go about it. thank you ...
class Article < ActiveRecord::Base
attr_accessible :category_id, :content, :excerpt, :title, :image, :remote_image_url
mount_uploader :image, ImageUploader
belongs_to :category
validates :title, :content, :excerpt, :category_id, presence: true
validates :title, uniqueness: true
extend FriendlyId
friendly_id :title, use: [:slugged, :history]
def long_title
" #{title} - #{created_at} "
end
end

Answer 1

Updated according to your comments:
First step, get all the categories, let's say you do this in categories#index action:
def index
#categories = Category.all
end
Now we're going to make a link to each category with that category's name in the categories#index view. When users click on a category they will be taken to that category's show page where we'll list all related articles:
<% #categories.each do |category| %>
<%= link_to category.name, category %>
<% end %>
We add the following in the categories#show action:
def show
#category = Category.includes(:articles).find(params[:id])
#articles = #category.articles
end
Then you can show all those articles by iterating over the #articles variable in the corresponding categories#show view. For example adding them as links in a some div:
<div class="articles">
<% #articles.each do |article| %>
<%= link_to article.title, article %><br>
<% end %>
</div>
Now do the same in the articles controller for the show action:
def show
#article = Article.find(params[:id])
end
So basically a user will see a link that says "Sports", when he clicks on it he will be taken to a page such as yoursite.com/categories/4 or yoursite.com/categories/sports if you're using friendly_id. Under this page all related sports articles will be listed and when they are clicked on the user will be taken to that article's show page.