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Ruby on Rails

Ruby on Rails Tutorial delete micropost with AngularJS

(1)Rails controller

$ vi app/controllers/microposts_controller.rb

  before_action :signed_in_user, only: [:create, :destroy]
  before_action :correct_user,   only: :destroy

  def destroy
    Micropost.find(params[:id]).destroy
    head :no_content
  end

(2)add link to views

$ vi app/assets/templates/static_pages/home.html.erb
$ vi app/assets/templates/users/show.html.erb

.....
<small class="text-muted">Posted {{mp.created_at | date:'medium'}}</sm
all>
<span ng-show="chkSignin().user.id == mp.user_id"><a href="" ng-click="delete(mp.id)">delete</a></span>
.....

(3)AngularJS controller

1)User Profile page "UsersShowCtrl" controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("UsersShowCtrl", function($scope, $routeParams, userResource,flashService,micropostsResource) {

  $scope.chkSignin = function() {
    return flashService.getUser();
  };

  $scope.delete = function(id) {
    micropostsResource.destroy({ id: id });
    userResource.show({ id: $routeParams.id }, function(response) {
      $scope.user_info = response;
      $scope.totalitems = $scope.user_info.microposts.length;
      microposts = $filter('orderBy')($scope.user_info.microposts,'created_at',true);
      $scope.currentitems = microposts.slice(start,end);
      flashService.setUser(response);
    });
  };
});

2)Home page "HomeCtrl" controller

  $scope.delete = function(id) {
    micropostsResource.destroy({ id: id });
    sessionResource.current_user({}, function(response) {
      tmp_feed = response.feed;
      $scope.totalitems = tmp_feed.length;
      feed_items = $filter('orderBy')(tmp_feed,'created_at',true);
      $scope.currentitems = feed_items.slice(start,end);
      flashService.setUser(response);
    });
  };
Ruby on Rails

Ruby on Rails Tutorial microposts feed pagination with AngularJS

1)AngularJS template view

$ vi app/assets/templates/static_pages/home.html.erb

<div ng-controller="HomeCtrl">
  <div ng-show="chkSignin().user.id > 0" class="row">
    <div class="col-sm-4">
.......
    </div>
    <div class="col-sm-8">
      <h3>Micropost Feed</h3>
      <ol class="microposts">
        <li ng-repeat="mp in currentitems">
...........
        </li>
      </ol>
      <pagination total-items="totalitems"
                  ng-model="currentpage"
                  max-size="maxsize"
                  items-per-page="itemsperpage"
                  class="pagination-sm"
                  previous-text="Previous"
                  next-text="Next"
                  first-text="First"
                  last-text="Last"
                  boundary-links="true">
      </pagination>
    </div>
  </div>

2)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("HomeCtrl", function($scope, flashService, micropostsResource, sessionResource, $filter) {
....
  $scope.submit = function() {
    function success(response) {
      sessionResource.current_user({}, function(response1) {
        var current_user = response1;
        $scope.totalitems = current_user.feed.length;
        feed_items = $filter('orderBy')(current_user.feed,'created_at',true);
        $scope.currentitems = feed_items.slice(start,end);
        flashService.setUser(current_user);
      });
      flashService.push(msg);
      $scope.$emit("$routeChangeSuccess");
    }
    function failure(response) {
........
    }
    micropostsResource.create($scope.micropost, success, failure);
  };
.........
  var feed_items = [];
  $scope.maxsize = 5;
  $scope.itemsperpage = 8;
  $scope.currentpage = 1;
  var start = 0;
  var end = start + $scope.itemsperpage;
  sessionResource.current_user({}, function(response) {
    if (response.feed) {
      var tmp_feed = response.feed;
      $scope.totalitems = tmp_feed.length;
      feed_items = $filter('orderBy')(tmp_feed,'created_at',true);
      $scope.currentitems = feed_items.slice(start,end);
    }
  });
  $scope.$watch('currentpage', function() {
    start = ($scope.currentpage - 1) * $scope.itemsperpage;
    end = start + $scope.itemsperpage;
    $scope.currentitems = feed_items.slice(start,end);
  },true);

});
Ruby on Rails

Ruby on Rails Tutorial microposts feed with AngularJS

1)Rails User model

$ vi app/models/user.rb

  def feed
    Micropost.where("user_id = ?", id)
  end

2)Rails controller

$ vi app/controllers/sessions_controller.rb

  def create
    user = User.find_by(email: session_params[:email].downcase)
    if user && user.authenticate(session_params[:password])
.........
      @user_info = {
        user: user,
        gravatar_url: "https://secure.gravatar.com/avatar/#{gravatar_id}",
        microposts: microposts,
        feed: user.feed
      }
      render json: @user_info, status: :accepted, location: user
    else
......
  def current_user
.......
    @user_info = {
      user: current_user,
      gravatar_url: "https://secure.gravatar.com/avatar/#{gravatar_id}",
      microposts: microposts,
      feed: current_user.feed
    }
    render json: @user_info, status: :accepted

3)AngularJS template view

$ vi app/assets/templates/static_pages/home.html.erb

<div ng-controller="HomeCtrl">
  <div ng-show="chkSignin().user.id > 0" class="row">
    <div class="col-sm-4">
.......
    </div>
    <div class="col-sm-8">
      <h3>Micropost Feed</h3>
      <ol class="microposts">
        <li ng-repeat="mp in chkSignin().feed">
          <a href="/users/{{chkSignin().user.id}}">
            <img alt="{{chkSignin().user.name}}"
                 src="{{chkSignin().gravatar_url}}?s=60"
                 class="gravatar"
            />
          </a>
          <a href="/users/{{chkSignin().user.id}}">{{chkSignin().user.name}}</a>
          <div>{{mp.content}}</div>
          <small class="text-muted">Posted {{mp.created_at | date:'medium'}}</small>
        </li>
      </ol>
    </div>
  </div>
Ruby on Rails

Ruby on Rails Tutorial micropost access control, error message with AngularJS

(1)micropost access control

$ vi app/controllers/microposts_controller.rb

class MicropostsController < ApplicationController
  before_action :signed_in_user, only: [:create, :destroy]
  before_action :correct_user,   only: :destroy

  private
    def signed_in_user
      remember_token = User.encrypt(cookies[:remember_token])
      current_user ||= User.find_by(remember_token: remember_token)
      if current_user.nil?
        render status: :unauthorized
      end
    end
    def correct_user
      micropost = Micropost.find(params[:id])
      remember_token = User.encrypt(cookies[:remember_token])
      current_user ||= User.find_by(remember_token: remember_token)
      if current_user.id != micropost.user_id
        render status: :unauthorized
      end
    end

(2)validation, error message

1)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("HomeCtrl", function($scope, flashService, micropostsResource, sessionResource) {

  $scope.submit = function() {
    function success(response) {
.........
    }
    function failure(response) {
      _.each(response.data, function(errors, key) {
        _.each(errors, function(e) {
          $scope.micropostForm[key].$dirty = true;
          $scope.micropostForm[key].$setValidity(e, false);
        });
      });
    }
    micropostsResource.create($scope.micropost, success, failure);
  };

  $scope.errorMessage = function(name) {
    var s = $scope.micropostForm[name].$error;
    result = [];
    _.each(s, function(key, value) {
      result.push(name + " " + value);
    });
    return result.join(", ");
  };

2)AngularJS template view

$ vi app/assets/templates/static_pages/home.html.erb

<div ng-controller="HomeCtrl">
.....
  <form name="micropostForm" ng-submit="submit()" novalidate>
    <textarea name="micropost" class="form-control"
              ng-model="micropost.content" rows="3"
              ng-maxlength="140" required>
    </textarea>
    <span class="text-danger" ng-show="micropostForm.content.$dirty && micropostForm.content.$error.maxlength">
      content is too long (maximum is 140 characters) 
    </span>
    <span class="text-danger" ng-show="micropostForm.content.$invalid && micropostForm.content.$dirty">
      {{errorMessage('content')}}
    </span><br />
    <button type="submit" ng-disabled="micropostForm.$invalid"
            class="btn btn-large btn-primary">Post
    </button>
  </form>
Ruby on Rails

Ruby on Rails Tutorial create micropost with AngularJS

1)Rails route

$ vi config/routes.rb

match '/app/microposts', to: 'microposts#create',  via: 'post'
match '/app/microposts', to: 'microposts#destroy', via: 'delete'

2)Rails controller

$ vi app/controllers/microposts_controller.rb

class MicropostsController < ApplicationController
  def create
    remember_token = User.encrypt(cookies[:remember_token])
    current_user ||= User.find_by(remember_token: remember_token)
    micropost = current_user.microposts.build(micropost_params)
    if micropost.save
      render json: micropost, status: :created
    else
      render json: micropost.errors, status: :unprocessable_entity
    end
  end

  private
    def micropost_params
      params.require(:micropost).permit(:content)
    end
end

3)AngularJS service

$ vi app/assets/javascripts/mymodule.js.erb

myModule.factory("micropostsResource", function($resource) {
  return $resource("/app/microposts",{},
    {
      'create':  { method: 'POST' },
      'destroy': { method: 'DELETE' }
    }
  );
});

4)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("HomeCtrl", function($scope, flashService, micropostsResource, sessionResource) {
  $scope.micropost = {};
  $scope.micropost.content = "Compose new micropost...";
  var msg = "Micropost created!";
  $scope.submit = function() {
    function success(response) {
      sessionResource.current_user({}, function(response1) {
        var current_user = response1;
        flashService.setUser(current_user);
      });
      flashService.push(msg);
      $scope.$emit("$routeChangeSuccess");
    }
    function failure(response) {
    }
    micropostsResource.create($scope.micropost, success, failure);
  };
  $scope.getMessage = function() {
    return flashService.get();
  };
});

myModule.factory("flashService", function ($rootScope, $timeout) {
  var queue = [];
  var currentMessage = "";
.......
  $rootScope.$on("$routeChangeSuccess", function() {
    currentMessage = queue.shift() || "";
  });

  return {
    push: function (msg) {
      queue.push(msg);
    },
......

5)AngularJS template view

$ vi app/assets/templates/static_pages/home.html.erb

<div ng-controller="HomeCtrl">
  <div ng-show="chkSignin().user.id > 0" class="row">
    <div class="bg-warning" ng-show="getMessage()">
      <p>{{getMessage()}}</p>
    </div>
    <div class="col-sm-4">
..........
      <form name="micropostForm" ng-submit="submit()" novalidate>
        <textarea name="content" class="form-control"
                  ng-model="micropost.content" rows="3" required>
        </textarea>
        <button type="submit" ng-disabled="micropostForm.$invalid"
                class="btn btn-large btn-primary">Post
        </button>
      </form>
Ruby on Rails

Ruby on Rails Tutorial microposts pagination with AngularJS

1)AngularJS template view

$ vi app/assets/templates/users/show.html.erb

<div ng-controller="UsersShowCtrl" class="container">
.........
    <div class="col-xs-6 col-sm-8">
      <h3>Microposts({{user_info.microposts.length}})</h3>
      <ol class="microposts">
        <li ng-repeat="mp in currentitems">
          <div>{{mp.content}}</div>
          <small class="text-muted">Posted {{mp.created_at | date:'medium'}}</small>
        </li>
      </ol>
      <pagination total-items="totalitems"
                  ng-model="currentpage"
                  max-size="maxsize"
                  items-per-page="itemsperpage"
                  class="pagination-sm"
                  previous-text="Previous"
                  next-text="Next"
                  first-text="First"
                  last-text="Last"
                  boundary-links="true">
      </pagination>
    </div>

2)AngularJS controller

$ vi app/assets/javascripts/mymodule.js.erb

myModule.controller("UsersShowCtrl", function($scope, $routeParams, userResource, flashService, $filter) {
  $scope.maxsize = 5;
  $scope.itemsperpage = 3;
  $scope.currentpage = 1;
  var microposts = [];
  var start = 0;
  var end = start + $scope.itemsperpage;
  userResource.show({ id: $routeParams.id }, function(response) {
    $scope.user_info = response;
    $scope.totalitems = $scope.user_info.microposts.length;
    microposts = $filter('orderBy')($scope.user_info.microposts,'created_at',true);
    $scope.currentitems = microposts.slice(start,end);

    $scope.$watch('currentpage', function() {
      start = ($scope.currentpage - 1) * $scope.itemsperpage;
      end = start + $scope.itemsperpage;
      $scope.currentitems = microposts.slice(start,end);
    },true);
  });
Ruby on Rails

Ruby on Rails Tutorial showing microposts with AngularJS

1)Rails controller

$ vi app/controllers/users_controller.rb

  def show
    user = User.find(params[:id])
    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
    microposts = user.microposts
    @user_info = {
      user: user,
      gravatar_url: "https://secure.gravatar.com/avatar/#{gravatar_id}",
      microposts: microposts
    }
    render json: @user_info
  end

2)AngularJS template view

$ vi app/assets/templates/users/show.html.erb

<div ng-controller="UsersShowCtrl">
  <div class="row">
.......
    <div class="col-xs-6 col-sm-8">
      <h3>Microposts({{user_info.microposts.length}})</h3>
      <ol class="microposts">
        <li ng-repeat="mp in user_info.microposts">
          <div>{{mp.content}}</div>
          <small class="text-muted">Posted {{mp.created_at | date:'medium'}}</small>
        </li>
      </ol>
    </div>
  </div>
</div>

3)css

$ vi app/assets/stylesheets/custom.css.scss

/* microposts */

.microposts {
  list-style: none;
  margin: 10px 0 0 0;

  li {
    padding: 10px 0;
    border-top: 1px solid #e8e8e8;
  }
}
Ruby on Rails

Ruby on Rails Tutorial micropost model,associations

(1)micropost model

1.basic model

$ rails generate model Micropost content:string user_id:integer

2.add index

$ vi db/migrate/…._create_microposts.rb

class CreateMicroposts < ActiveRecord::Migration
  def change
    create_table :microposts do |t|
      t.string :content
      t.integer :user_id

      t.timestamps
    end
    add_index :microposts, [:user_id, :created_at]
  end
end

3.migrate

$ bundle exec rake db:migrate

4.micropost validations

$ vi app/models/micropost.rb

class Micropost < ActiveRecord::Base
  validates :content, presence: true, length: { maximum: 140 }
  validates :user_id, presence: true
end

(2)User/Micropost associations

1. Micropost model

$ vi app/models/micropost.rb

class Micropost < ActiveRecord::Base
  belongs_to :user
......

2. User model

$ vi app/models/user.rb

class User < ActiveRecord::Base
  has_many :microposts, dependent: :destroy
.....

3. check

$ rails console

2.0.0p247 :001 > micropost = Micropost.create(content: "Test #1", user_id: 10)

2.0.0p247 :002 > micropost = Micropost.create(content: "Test #2", user_id: 10)

2.0.0p247 :003 > micropost=Micropost.find_by(user_id: 10)
  Micropost Load (0.3ms)  SELECT  "microposts".* FROM "microposts"  WHERE "microposts"."user_id" = 10 LIMIT 1
 => #<Micropost id: 1, content: "Test #1", user_id: 10, created_at: "2015-07-21 00:00:50", updated_at: "2015-07-21 00:00:50">

2.0.0p247 :004 > micropost.user
  User Load (0.1ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 10]]
 => #<User id: 10, name: "testuser10", email: "test10@example.com", created_at: "2015-07-13 08:45:35", updated_at: "2015-07-20 08:30:47", password_digest: "$2a$10$BLM/nUrE1wptItRDOkKm4OynNZ718yjoDnnIBUkWL0s…", remember_token: "48c3edd244e42156c38e89fca5fe5616c5cfcce1", admin: false>