Deleting a row from a CSV file with Ruby - ruby

Question

I've seen similar answers to this question but I think I need something more specific to my code. Basically I've called the row from the CSV file but now I need to delete the called row. Sounds simple as I write this yet here I am asking you all for help. I know there is a lot of code here but I figured the more there is the more easier you will be able to understand the context. Apologies if there is too much noise in the code.
def delete_user_menu
puts "============================================"
delete_users_active_list
puts " "
puts "Please type in the name of the user you wish to eradicate: "
print "> "
eradicate(gets.chomp)
end
def eradicate(delete_input)
delete_row = delete_authentication(delete_input)
if delete_row
puts "Are you sure you want to delete #{delete_input} from the database?"
puts "[y]es or [n]o"
print "> "
delete_answer = gets.chomp
if delete_answer == "y"
delete_user
after_deletion_menu
elsif delete_answer == "n"
puts "Close call! Taking you back to main menu."
sleep 2
admin_main_menu
else
puts "Input not recognised. Please try again."
eradicate(delete_input)
end
else
puts "User not recognized. Please try again."
sleep 1
delete_user_menu
end
end
def delete_user
# this is where the delete user function needs to go
after_deletion_menu
end
def after_deletion_menu
puts " "
puts "User deleted! What would you like to do now?"
puts "1. Delete another user"
puts "2. Back to main menu"
print "> "
after_deletion_choice = gets.chomp
if after_deletion_choice == "1"
delete_user_menu
elsif after_deletion_choice == "2"
admin_main_menu
else
puts "Input not recognized. Please try again."
after_deletion_menu
end
end
def delete_users_active_list
CSV.foreach("./users.csv", headers: true) do |row|
username = row['username']
puts "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
puts "Username: #{username}"
end
end
def delete_authentication(username)
CSV.open('users.csv', headers: true).find { |row| row['username'] == username }
end
I've had a look at this question How to remove a row from a CSV with Ruby
but I don't fully understand the answers, hence why I'm here. Any help is much appreciated.

Answer 1

I looked at the link. First, they are reading the entire csv file into table:
table = CSV.table(#csvfile)
then deleting the row from table:
table.delete_if do |row|
row[:foo] == 'true'
end
Finally, they are completely replacing the original file with the new table minus the row:
File.open(#csvfile, 'w') do |f|
f.write(table.to_csv)
end
This is generally how you have to do this kind of operation when you are dealing with a file. It's not like a database.
EDIT - in your case:
delete_user(delete_input)
...
def delete_user(user)
...
table.delete_if { |row| row[:username] == user }
...