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IT231 -- Final Review Questions

1. Define these terms:
   Array  Range  Model  FormTagHelper  FormHelper  Validation  Digest  Hex  Base64  ASCII  One-to-many Relationship
    
   
   See the course notes for these definitions.
    
2. How do you attach a CSS class to a control?
    
   Ans: With :class => 'ctrl' where .ctrl is defined in the CSS file.
    
3. What types of validation are available in Rails?
    
   Ans: validates_presence_of, validates_length_of, validates_uniqueness_of, validates_format_of, validates_numericality_of
    
4. How do you execute a Ruby script from the Rails console?
    
   Ans: load 'rubyfile.rb'
    
5. Explain the difference between FormTagHelper and FormHelper methods.
    
   Ans: FormTagHelper methods are meant to be used without a database; the controls created by FormHelper methods correspond to the fields of a table in a database.
    
6. Explain the difference between the following: for, each, collect.
    
   Ans: for and each are used to repeat a calculation or operation for each element in an array or range. collect repeats a calculation for each element of an array, then collects all these calculations together into a new array.
    
7. What are the the database manipulation methods available from a model?
    
   Ans: find, all, new, save, delete, delete_all
    
8. How do you pass data from a view to a controller?
    
   Ans: With params statements.
    
9. What are the 17 HTML colors and their hex color codes?
    
   Ans: red #FF0000, lime #00FF00, blue #0000FF, yellow #FFFF00, aqua #00FFFF, fuschia #FF00FF, maroon #800000, green #008000, navy #000080, olive #808000, teal #008080, purple #800080, black #000000, white #FFFFFF, gray or grey #808080, silver #C0C0C0.
    
10. What is a websafe color?
     
    Ans: Colors all of whose color components consist of 00, 33, 66, 99, CC, or FF.
     
11. Convert the string "turkey" to ASCII and base-64. Ans:
    

    dHVya2V5