Ruby on Rails Fundamentals Warmup Day 04

day04.rb

# Note: run this file in ruby like this:
# $ ruby day04.rb

# This is a Ruby class
class ReadingMaterial
  def initialize(contents = nil)
    @contents = contents
  end
  
  # reader / getter
  def contents
    @contents
  end
  
  # writer / setter
  def content=(new_contents)
    @contents = new_contents
  end
  
  def printed?
    :maybe
  end  
  
  def ReadingMaterial.can_be_read?
    true
  end
  
  def can_be_read?
    self.class.can_be_read?
  end
end

# This is also a Ruby class. 
class Book < ReadingMaterial
end

# 1. What does the `<` above tell us?

# 2. Book is a class but it is also a what?
# HINT: It is a _blank_ of ReadingMaterial.

# 3. Create a new book and assign it to a variable named book

# 4. What do you expect to see when this is run? (uncomment to see it)
# puts "Is the book printed? #{book.printed?}"

# Here is another class.
class EBook < Book
  def printed?
    false
  end
end

# 5. Create a new ebook and assign it to a variable

# 6. Display if the ebook is printed or not

class PaperbackBook < Book
  def printed?
    true
  end
end

class Magazine < ReadingMaterial
  def initialize(special_cover = false, contents = nil)
    @special_cover = special_cover
  end
  
  def special_cover?
    @special_cover
  end
end

# 7. Create a new PaperbackBook and a new Magazine, assigned to variables

# 8. Display interesting things about them

# 9. How could we shorten the class definition of ReadingMaterial?
# HINT: We can use something Ruby provides...

### The rest of these are in our rails project

# 10. Start the Rails console in our project directory.
  # HINT: use the rails command and a subcommand to do this. Don't forget
  # to prefix with 'bin/'.

# 11. How many courses do you have in your database?

# 12. Find the first course in our database.

# 13. What does CRUD stand for?

http://bit.ly/1pi7I2Y