Delete an array from a class in ruby - ruby

Question

So I am creating a class in ruby where in I will be able to insert my data on a text file and then read, find from it but I am stuck on delete as well update/edit.
Basically I created a method called "find" and I made it as a reference on my "delete" method.
def find(keyword="")
if keyword
person = People.read_people
found = person.select do |pip|
pip.name.downcase.include?(keyword.downcase) ||
pip.age.downcase.include?(keyword.downcase) ||
pip.country.downcase.include?(keyword.downcase)
end
found.each do |person|
puts person.name + " | " + person.age + " | " + person.country
end
else
puts "find using a key phrase eg. 'find sam' \n\n"
end
end
def list
puts "\nListing People \n\n".upcase
people = People.read_people
people.each do |person|
puts person.name + " | " + person.age + " | " + person.country
end
end
def delete(keyword="")
if keyword
person = People.read_people
found = person.select do |pip|
pip.name.downcase.include?(keyword.downcase) ||
pip.age.downcase.include?(keyword.downcase) ||
pip.country.downcase.include?(keyword.downcase)
end
person.delete(found)
else
puts "find using a key phrase eg. 'find josh' \n\n"
end
end
As you can see I was trying to delete the supplied keyword from the array (w/c was save on a text file) via class method called read_people. Here's how it looks like:
def self.read_people
# read the people file
# return instances of people
people = []
if file_usable?
file = File.new(##filepath, 'r')
file.each_line do |line|
people << People.new.import_line(line.chomp)
end
file.close
end
return people
end
def import_line(line)
line_array = line.split("\t")
#name, #age, #country = line_array
return self
end
How can I fix this and delete the found item via keyword?
See the actual codes here: https://repl.it/repls/VastWildFact

Answer 1

Change
person.delete(found)
to
person -= found # Equivalent to person = person - found
It should work as per https://ruby-doc.org/core-2.2.0/Array.html#method-i-2D
ary - other_ary → new_ary
Returns a new array that is a copy of the original array, removing any items that also appear in other_ary. The order is preserved from the original array.
It compares elements using their hash and eql? methods for efficiency.
Example: [ 1, 1, 2, 2, 3, 3, 4, 5 ] - [ 1, 2, 4 ] #=> [ 3, 3, 5 ]
Another solution is to use reject as follows:
person.reject! do |pip|
pip.name.downcase.include?(keyword.downcase) ||
pip.age.downcase.include?(keyword.downcase) ||
pip.country.downcase.include?(keyword.downcase)
end

Answer 2

Basically you're going to want an export_people and write_people method that'll look something like this:
def self.export_people(people)
people.map do |person|
[person.name, person.age, person.country].join("\t")
end
end
def self.write_people(people)
File.new(##filepath, 'w') do |f|
f.write(export_people(people))
end
end
# Usage:
Person.write_people(array_of_people)
With the above code, you'd call the modified delete method as detailed in Tarek's answer, and then Person.write_people(array_of_people) to write back to the file.