RSR312-206 / rails_console_practice

1. Using the new/save syntax, create a student with a first and last name and an age user = User.new(first_name: "Rachel", last_name: "Routson", age: 31)

2. Save the student to the database user.save

3. Using the find/set/save syntax update the student's first name to Myles user.first_name = "Miles" user.save

4. Delete the student (where first_name is Myles)

user.destroy

5. In your model, validate that every Student's last name is unique

class User < ActiveRecord::Base
    validates_presence_of :last_name
  end

6. In your model, validate that every Student has a first and last name that is longer than 4 characters

class User < ActiveRecord::Base
              validates :first_name, :last_name
                presence: true,
                length {minimum: 4}
              end

7. Validate that every first and last name cannot be empty in the code from question 6- presence: true

8. Create a migration that adds a column with a type of string called favorite_color to the students table (don't forget to run rake db:migrate after and for this question write the command in terminal to generate this migration)

class AddColorToUsers < ActiveRecord::Migration
              def change
              add_column :users, :favorite_color, :string
              end
            end

9. Using the create syntax create a student named John Doe who is 23 years old and has a favorite_color of purple student = User.create(first_name: "John", last_name: "Doe", age: 23, favorite_color: "purple")

10. Show if this new student entry is valid User.where(first_name: "John")

11. Show the number of errors for this student instance

  , @messages={:last_name=>["is too short (minimum is 4 characters)"]}> 

12. Using update, Change John Doe's name to Martin Fowler student.first_name = "Martin" student.save student.last_name = "Fowler" student.save

13. Save Martin Fowler student.save

14. Find all of the Students User.all

15. Find the student with an ID of 128 and if it does not exist, make sure it returns nil and not an error Student.find_by_id(128)

16. Find the first student in the table Student.first

17. Find the last student in the table Student.last

18. Find the student with the last name of Fowler Student.where(last_name: "Fowler")

19. Find all of students who have the first name of Martin and a favorite color of red Student.where(favorite_color: "red", first_name: "Martin")

20. Find all of the students and limit the search to 5 students, starting with the 2nd student and finally, order the students in alphabetical order Student.offset(2).limit(5).order(last_name: asc)

21. Delete Martin Fowler (but first look up who he is!) Student.where(first_name: Martin") martin = _ martin.destroy

22. Delete all of the students Student.destroy_all

Bonus

1. Use the validates_format_of and regex to only validate names that consist of letters (no numbers or symbols) and start with a capital letter
2. Write a custom validation to ensure that no one named Elie Schoppik, Colt Steele or Tim Garcia is included in the students table.