Question

I am trying to create a query that finds all the Posts that belong to the same Topic id. I believe I’m on the right track, but all @posts returns is every post in the database.

Topics controller:

def show
  @topic = Topic.find(params[:id])
  @title = @topic.name
  @posts = Post.where('topic' == @topic).order("updated_at").page(params[:page]).per(10) #not working. still just fetches all posts
  respond_with(@posts)
end

Topic model:

class Topic < ActiveRecord::Base
  has_many :posts, :dependent => :destroy
  attr_accessible  :name
end

Post model:

class Post < ActiveRecord::Base
  belongs_to :topic,    :touch => true
  accepts_nested_attributes_for :topic
  attr_accessible :name, :title, :content, :topic, :topic_attributes
end

Answer 1

I would recommend you to use the association in the model to get all the posts. you could do it like this:

def show
  @topic = Topic.find(params[:id])
  @title = @topic.name
  @posts = @topic.posts.order("updated_at").page(params[:page]).per(10)     
  respond_with(@posts)
end