w7 assessment

assessments/27-28/week-07/readme.md

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+# <img src="https://cloud.githubusercontent.com/assets/7833470/10899314/63829980-8188-11e5-8cdd-4ded5bcb6e36.png" height="60"> Week 7 Assessment
+
+1. You have a SQL table named `clothes` with three columns (`type`, `color`, and `count`). Use **raw SQL** (i.e. NOT Active Record) to insert three items into the table with one command.
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+2. You've discovered that one of your SQL queries is taking two seconds to respond. The query runs when loading the user profile page to build a list of favorites for that user. While debugging you notice that the query plan mentions a full table scan. Which database technique can you use to speed up this operation?
+
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+3. Which Rails `ActiveModel` feature allows you create and check secure user passwords?
+
+  <br>
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+
+4. You have a form on your website that looks like this:
+
+  ```html
+  <form id="signup-form" action="/users/new" method="post">
+    <input type="email" name="user[email]" required minlength="2" autofocus>
+    <input type="password" name="user[password]" required minlength="6">
+    <input type="submit" value="Sign Up">
+  </form>
+  <script>
+    $('#signup-form').validate();
+  </script>
+  ```
+
+  Is this validation strategy enough to prevent a user from entering invalid data into the database? Why or why not?
+
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+5. You have a Rails app with three models: `Course`, `Student`, and `Enrollment`. A course has many students through enrollments. How would you implement this relationship in the `Course` model?
+
+  ```ruby
+  class Course < ActiveRecord::Base
+  end
+  ```
+
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+6. Name two benefits of using the Rails asset pipeline.
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+7. You have a Rails app with the following stylesheets:
+
+  ```
+  homepage.css
+  layout.css
+  main.css
+  navbar.css
+  profile.css
+  ```
+
+  You want to take advantage of the Rails asset pipeline to combine your stylesheets into one `application.css` file to send to the client. You need the stylesheets to load in the following order:
+
+  ```
+  1. layout.css
+  2. main.css
+  3. navbar.css
+  4. homepage.css
+  5. profile.css
+  ```
+
+  Edit the default `application.css` file below to include all your stylesheets in the correct order:
+
+  ```css
+  /*
+   * ...
+   *
+   *= require_tree .
+   *= require_self
+   *
+   *
+   *
+   *
+   *
+   *
+   */
+  ```
+
+8. Fill in the blanks in the following RSpec test. The test is for an instance method in the `User` model called `full_name` that combines the user's first and last names to return the user's full name.
+
+  ```ruby
+  before do
+    @user = FactoryGirl.create(:user)
+  end
+  describe "__________" do
+    it "____________________" do
+      expect(__________).to eq(__________)
+    end
+  end
+  ```
+
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+  <br>
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assessments/27-28/week-07/solutions.md

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+# <img src="https://cloud.githubusercontent.com/assets/7833470/10899314/63829980-8188-11e5-8cdd-4ded5bcb6e36.png" height="60"> Week 7 Assessment [SOLUTIONS]
+
+1. You have a SQL table named `clothes` with three columns (`type`, `color`, and `count`). Use **raw SQL** (i.e. NOT Active Record) to insert three items into the table with one command.
+
+  ```SQL
+  INSERT INTO clothes
+    (type, color, count)
+  VALUES
+    ("shoes", "blue", 200),
+    ("shirts", "red", 150),
+    ("short", "black", 20);
+  ```
+
+2. You've discovered that one of your SQL queries is taking two seconds to respond. The query runs when loading the user profile page to build a list of favorites for that user. While debugging you notice that the query plan mentions a full table scan. Which database technique can you use to speed up this operation?
+
+  > Add an index on the favorites table to make lookups faster and prevent the full table scan.
+
+3. Which Rails `ActiveModel` feature allows you create and check secure user passwords?
+
+  ```ruby
+  has_secure_password
+  ```
+
+4. You have a form on your website that looks like this:
+
+  ```html
+  <form id="signup-form" action="/users/new" method="post">
+    <input type="email" name="user[email]" required minlength="2" autofocus>
+    <input type="password" name="user[password]" required minlength="6">
+    <input type="submit" value="Sign Up">
+  </form>
+  <script>
+    $('#signup-form').validate();
+  </script>
+  ```
+
+  Is this validation strategy enough to prevent a user from entering invalid data into the database? Why or why not?
+
+  > No, it's not, because if JavaScript fails to load or the client "hacks" your site by removing the `required` or `minlength` attributes from the form in the DOM, invalid data can pass straight through to your database. You should use client-side validations for a good user experience, but you need server-side (database) validations to truly validate your data.
+
+5. You have a Rails app with three models: `Course`, `Student`, and `Enrollment`. A course has many students through enrollments. How would you implement this relationship in the `Course` model?
+
+  ```ruby
+  class Course < ActiveRecord::Base
+    has_many :enrollments, dependent: :destroy
+    has_many :students, through: :enrollments
+  end
+  ```
+
+6. Name two benefits of using the Rails asset pipeline.
+
+  * Compresses assets (CSS and JavaScript files) so they load faster.
+  * Combines asset files before sending them to the browser.
+  * Caches asset files to make sure they are only downloaded when they are updated.
+
+7. You have a Rails app with the following stylesheets:
+
+  ```
+  homepage.css
+  layout.css
+  main.css
+  navbar.css
+  profile.css
+  ```
+
+  You want to take advantage of the Rails asset pipeline to combine your stylesheets into one `application.css` file to send to the client. You need the stylesheets to load in the following order:
+
+  ```
+  1. layout.css
+  2. main.css
+  3. navbar.css
+  4. homepage.css
+  5. profile.css
+  ```
+
+  Edit the default `application.css` file below to include all your stylesheets in the correct order:
+
+  ```css
+  /*
+   * ...
+   *
+   *= layout.css
+   *= main.css
+   *= navbar.css
+   *= homepage.css
+   *= profile.css
+   *
+   */
+  ```
+
+8. Fill in the blanks in the following RSpec test. The test is for an instance method in the `User` model called `full_name` that combines the user's first and last names to return the user's full name.
+
+  ```ruby
+  before do
+    @user = FactoryGirl.create(:user)
+  end
+  describe "#full_name" do
+    it "should combine first and last name" do
+      expect(@user.full_name).to eq("#{@user.first_name} #{@user.last_name}")
+    end
+  end
+  ```