Ignore first line on csv parse Rails - ruby-on-rails

Question

I am using the code from this tutorial to parse a CSV file and add the contents to a database table. How would I ignore the first line of the CSV file? The controller code is below:
def csv_import
#parsed_file=CSV::Reader.parse(params[:dump][:file])
n = 0
#parsed_file.each do |row|
s = Student.new
s.name = row[0]
s.cid = row[1]
s.year_id = find_year_id_from_year_title(row[2])
if s.save
n = n+1
GC.start if n%50==0
end
flash.now[:message] = "CSV Import Successful, #{n} new students added to the database."
end
redirect_to(students_url)
end

Answer 1

This question kept popping up when i was searching for how to skip the first line with the CSV / FasterCSV libraries, so here's the solution that if you end up here.
the solution is...
CSV.foreach("path/to/file.csv",{:headers=>:first_row}) do |row|
HTH.

Answer 2

#parsed_file.each_with_index do |row, i|
next if i == 0
....

Answer 3

If you identify your first line as headers then you get back a Row object instead of a simple Array.
When you grab cell values, it seems like you need to use .fetch("Row Title") on the Row object.
This is what I came up with. I'm skipping nil with my if conditional.
CSV.foreach("GitHubUsersToAdd.csv",{:headers=>:first_row}) do |row|
username = row.fetch("GitHub Username")
if username
puts username.inspect
end
end

Answer 4

Using this simple code, you can read a CSV file and ignore the first line which is the header or field names:
CSV.foreach(File.join(File.dirname(__FILE__), filepath), headers: true) do |row|
puts row.inspect
end
You can do what ever you want with row. Don't forget headers: true

Answer 5

require 'csv'
csv_content =<<EOF
lesson_id,user_id
5,3
69,95
EOF
parse_1 = CSV.parse csv_content
parse_1.size # => 3 # it treats all lines as equal data
parse_2 = CSV.parse csv_content, headers:true
parse_2.size # => 2 # it ignores the first line as it's header
parse_1
# => [["lesson_id", "user_id"], ["5", "3"], ["69", "95"]]
parse_2
# => #<CSV::Table mode:col_or_row row_count:3>
here where it's the fun part
parse_1.each do |line|
puts line.inspect # the object is array
end
# ["lesson_id", "user_id"]
# ["5", " 3"]
# ["69", " 95"]
parse_2.each do |line|
puts line.inspect # the object is `CSV::Row` objects
end
# #<CSV::Row "lesson_id":"5" "user_id":" 3">
# #<CSV::Row "lesson_id":"69" "user_id":" 95">
So therefore I can do
parse_2.each do |line|
puts "I'm processing Lesson #{line['lesson_id']} the User #{line['user_id']}"
end
# I'm processing Lesson 5 the User 3
# I'm processing Lesson 69 the User 95

Answer 6

data_rows_only = csv.drop(1)
will do it
csv.drop(1).each do |row|
# ...
end
will loop it