Ruby printing out hash data

Question

I am working on a database that holds records for a school, where the key is the studentID, followed by the values of, first name, last name, major, and catalog year. I am working on the display function, which loops through the users which have been added to the hash. however, my code is not printing out of all the records i have added to the database.

it is only printing out one record listing, rather than my multiple inputted entries.

here is an example of input: ----------------------------- Student Database Records -----------------------------

1) Insert new record to database
2) Modify record in database
3) Remove record from database
4) Display record(s) in database
5) Quit
6) Enter choice:
1

-----------------------------
Add Record(s)
-----------------------------

Enter Student Identifcation Number:
32424

Enter First name of Student:
sfsdf

Enter Last name of Student:
sdfsfsf

Enter Major of Student:
sdfsdfs

Enter Catalogue Year:
sdfsfds

Your entry for Student ID 32424 has been added to the database.

------------------------------------------------------------------------
32424: sfsdf, sdfsfsf, sdfsdfs, sdfsfds
------------------------------------------------------------------------

here is my code to add an array to a hash

    student_id = gets().chomp


    if school_database.sDB.has_key?(student_id)
        puts "Student Record Already Existent"
        return school_database
    end 

    puts "\nEnter First name of Student: "
    first_name = gets().chomp

    puts "\nEnter Last name of Student: "
    last_name = gets().chomp

    puts "\nEnter Major of Student: "
    major = gets().chomp

    puts "\nEnter Catalogue Year: "
    catalogue_year = gets().chomp

    puts "\nYour entry for Student ID #{student_id} has been added to the database.\n"

    puts "\n------------------------------------------------------------------------"
    puts "#{student_id}: #{first_name}, #{last_name}, #{major}, #{catalogue_year}"
    puts "------------------------------------------------------------------------\n\n"

    store_account_data =  first_name + "," + last_name + "," + major + "," + catalogue_year

    school_database.sDB[student_id] = [store_account_data]

    return school_database

here is the code i am using to loop through my hash to print out the records.

school_database.sDB.each do |key, store_account_data|
puts "\n"
puts "#{key}: #{store_account_data.join(',')}"

positively, I run the .size command, and i discovered that it is adding muliple entries to the hash, however, it is not printing all of them

any ideas?

Answer 1

String's + method places fairly strict requirements on what can appear on the right-hand side. You need to explicitly call to_s :

puts key + ' : ' + store_account_data.to_s

String interpolation is much more forgiving; it basically calls to_s for you:

puts "#{key} : #{store_account_data}"

Or perhaps you want a more detailed dump:

puts "#{key} : #{store_account_data.inspect}"

Or no brackets:

puts "#{key} : #{store_account_data.join(', ')}"

Or perhaps elements of store_account_data are objects, and you want to just print one property of them:

puts "#{key} : #{store_account_data.map(&:field_to_print).join(', '}"

Answer 2

I would do something like:

def display(database)
  database.sDB.each do |key, account|
    puts "#{key}: #{account.join(',')}"
  end
end

Answer 3

You can use ruby's join method. I believe that's pretty common among languages.