Rails Prep Intro

_rails-prep-intro.md

Rails prep

• Two weeks until the end of term

• Next term Rails and the Rails project

  
  

What we will be covering

• Best practices
• Testing
• Working with larger projects
• More on objects
• Databases
• MVC pattern
• Sinatra

Scaling up

• larger code bases
  • splitting code into multiple files
  • organising files
  • recognising and implementing patterns
• processes
  • more git practice

Automate All the Things

• Lazy developer

• ROI

  • how much time on automation vs time on project

• Rubocop

  • Coding Style for Rails - best practices for methods lengths, examples

Review Objects

• Review a class and the various variable types and scope
  • variable local to a method
  • instance variable
  • class variable

class Person

    @@employee_number = 0
    def initialize(name, job_title, phone, salary)
        @name = name
        @job_title = job_title
        @phone = phone
        @salary = salary
        @@employee_number = @@employee_number + 1
        @number = @@employee_number
    end

    # getters
    def name
        return @name
    end

    def job_title
        return @job_title
    end

    def phone
        return @phone
    end

    def salary
        return @salary
    end

    def description
        return "#{@name} is a #{job_title}"
    end
end

kerry = Person.new("Kerry MacFarlane", "developer", "555-1234", "60000")
terry = Person.new("Terry Grayson", "manager", "555-3456", "70000")
sam = Person.new("Sam Ferguson", "developer", "555-4321", "65000")

puts kerry.description
puts terry.description
puts sam.description

person.rb

class Person

    @@employee_number = 0
    def initialize(name, job_title, phone, salary)
        @name = name
        @job_title = job_title
        @phone = phone
        @salary = salary
        @@employee_number = @@employee_number + 1
        @number = @@employee_number
    end

    # getters
    def name
        return @name
    end

    def job_title
        return @job_title
    end

    def phone
        return @phone
    end

    def salary
        return @salary
    end

    def description
        return "#{@name} is a #{job_title}"
    end
end

kerry = Person.new("Kerry MacFarlane", "developer", "555-1234", "60000")
terry = Person.new("Terry Grayson", "manager", "555-3456", "70000")
sam = Person.new("Sam Ferguson", "developer", "555-4321", "65000")

puts kerry.description
puts terry.description
puts sam.description

# 0. Run and verify it works
# 1. Use rubocop to detect violations
# 2. Fix all the rubocop violations
# 3. Run and verify the examples still work
# 4. Update the initialize to sentence case the job titles
# 5. Add another person example with a multi-word job title to test this
# 6. Change the description method to include the salary. Use money formatting.
# 7. Change the class to use an attribute accessor and delete the four getters
# 8. Run and verify the examples still work
# 9. Create a getter for the class variable employee number 
# 10. Write code to display the value for employee number 

person_rubocop_friendly_soltuion.rb

# class to demo ruby features
class Person
  attr_reader :name, :job_title, :phone, :salary

  @employee_number = 0
  def initialize(name, job_title, phone, salary)
    @name = name
    @job_title = job_title
    @phone = phone
    @salary = salary.to_i
    @number = Person.increase_number
  end

  def self.increase_number
    @employee_number += 1
  end

  def description
    "#{@name} is a #{@job_title} and has salary #{@salary} ##{@number}"
  end
end