Ruby CSV |如何在阅读CSV时跳过几列？

Question

我使用Active record Import gem将数据从CSV文件批量导入数据库。但我想在导入时跳过几个CSV列。

例如，我的xaa.csv包含name，author，author_id，rating等标题。 导入时，我想跳过＆＃39; author_id＆＃39;列值并导入所有其他列。

books = CSV.read("/public/xaa.csv") //What more should I do here to skip the 3rd column
columns = [:name, :author, :rating]
Book.import columns, books, :validate => false

Answer 1

books = []

CSV.foreach('/public/xaa.csv', headers: true) do |row|
  books << [row['name'], row['author'], row['rating']]
end

columns = [:name, :author, :rating]
Book.import(columns, books, validate: false)

Answer 2

books = CSV.readlines(path, headers:true).map{|row| row.values_at('name','rating') }

vegetaras的版本内存效率稍高。