How can I get all posts from a specific user - ruby-on-rails

Question

I'm creating my own blog on Rails with posts and users. I need to show all posts from specific author when I click on him (here the concept:link). What should I do for this?
Please say what extra information or code should I add
users_controller:
class UsersController < ApplicationController
def show
#user = User.find(params[:id])
#posts = #user.posts
end
end
posts_controller:
class PostsController < ApplicationController
before_filter :authenticate_user!, :except => [:show, :index]
# GET /posts
# GET /posts.json
def index
#posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #posts }
end
end
# GET /posts/1
# GET /posts/1.json
def show
#post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #post }
end
end
# GET /posts/new
# GET /posts/new.json
def new
#post = Post.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #post }
end
end
# GET /posts/1/edit
def edit
#post = Post.find(params[:id])
end
# POST /posts
# POST /posts.json
def create
##post = Post.new(params[:post])
#post = current_user.posts.build(params[:post])
respond_to do |format|
if #post.save
format.html { redirect_to #post, notice: 'Post was successfully created.' }
format.json { render json: #post, status: :created, location: #post }
else
format.html { render action: "new" }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PUT /posts/1
# PUT /posts/1.json
def update
#post = Post.find(params[:id])
respond_to do |format|
if #post.update_attributes(params[:post])
format.html { redirect_to #post, notice: 'Post was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post = Post.find(params[:id])
#post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
end
end
user model:
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
has_many :posts, :dependent => :destroy
validates :fullname, :presence => true, :uniqueness => true
validates :password, :presence => true
validates :email, :presence => true, :uniqueness => true
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
attr_accessible :email, :password, :password_confirmation, :fullname
end
post model:
class Post < ActiveRecord::Base
attr_accessible :text, :title
validates :user_id, :presence => true
validates :title, :presence => true
validates :text, :presence => true
belongs_to :user
has_many :comments
end

Answer 1

This is a fairly straight forward use of Ruby on Rails. I recommend reading Active Record Basics to get up to speed.
First, you should have a belongs_to relationship between Posts and Users that looks like this:
class User < ActiveRecord::Base
has_many :posts
end
class Post < ActiveRecord::Base
belongs_to :user
end
This adds a .posts method to the User instance and a .user method to the Post instance.
Then you have to make a decision about how you want the URL structure of your application to work. Here are a few options from the top of my head:
/posts?user=:user_id
/posts/by/:user_id
/users/:id/posts
Given the relationship between a User and their Posts, my recommendation (and I believe the general "Rails Way") would be #3. So, let's add the routes to config/routes.rb:
The short way to create JUST that route:
get 'users/:id/posts' => 'users#posts', :as => :user_posts
The long way to create the route based on resources:
resources :users do
member do
get :posts
end
end
Both approaches will provide a helper method called user_posts_path and one called user_posts_url which can be used in your view to link to the list of user posts using the link_to helper method:
<%= link_to post.user.name, user_posts_path(post.user) %>
Now, you have to add the controller action in app/controllers/users_controller.rb:
class UsersController < ActionController::Base
def posts
#user = User.find(params[:id])
#posts = #user.posts
end
end
and then add your HTML/ERB code to app/views/users/posts.html.erb
<% #posts.each do |post| %>
<%= post.inspect %>
<% end %>
That should give you the basic ability to show a user's posts. You can enhance it by reusing a post partial or some other nice shortcuts, but I'll leave that as an exercise for you to figure out.

Answer 2

You need 2 models: User and Post. There is a relation between them: User HAS MANY posts, post BELONGS TO user. To create this relation in a database you should add user_id column to posts table. To do this simply run the following command:
rails generate migration AddUserIdToPosts user_id: integer
Don't forget to run rake db:migrate after that
To create association between models add to the User model:
has_many :posts, dependent: :destroy
And to Post model:
belongs_to :user
Now you can use 'user' method on post and 'posts' method on user. For example in show action of users controller:
#user = User.find(params[:id])
#posts = #user.posts
This links will help you:
http://guides.rubyonrails.org/association_basics.html
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html