我一直在引用RailsCasts #396来导入来自csv,xls,xlas文件的数据。根据railscast(Rails 3.2.9),导入方法是
def self.import(file)
spreadsheet = open_spreadsheet(file)
header = spreadsheet.row(1)
(2..spreadsheet.last_row).each do |i|
row = Hash[[header, spreadsheet.row(i)].transpose]
product = find_by_id(row["id"]) || new
product.attributes = row.to_hash.slice(*accessible_attributes)
product.save!
end
end
def self.open_spreadsheet(file)
case File.extname(file.original_filename)
when ".csv" then Csv.new(file.path, nil, :ignore)
when ".xls" then Excel.new(file.path, nil, :ignore)
when ".xlsx" then Excelx.new(file.path, nil, :ignore)
else raise "Unknown file type: #{file.original_filename}"
end
end
但是由于Rails 4x实现了强大的params,我得到了undefined local variable or method 'accessible_attributes'
错误
所以我抬起头来找到这个stackoverflow问题Rails 4 how to call accessible_attributes from Model,根据我试过的答案
def attr_names
[user_id, last_name, first_name, last_name_kana, first_name_kana, created_at,created_by, updated_at, updated_by, del_flag]
end
def self.import(file)
spreadsheet = open_spreadsheet(file)
header = spreadsheet.row(1)
(2..spreadsheet.last_row).each do |i|
row = Hash[[header, spreadsheet.row(i)].transpose]
user = find_by(user_id: row["user_id"]) || new
user.attributes = row.to_hash.slice(*attr_names)
user.save!
end
end
def self.open_spreadsheet(file)
case File.extname(file.original_filename)
when ".csv" then Roo::CSV.new(file.path, csv_options: {encoding: "SJIS"})
when ".xls" then Roo::Excel.new(file.path, nil, :ignore)
when ".xlsx" then Roo::Excelx.new(file.path, nil, :ignore)
else raise "Unknown file type: #{file.original_filename}"
end
end
仍然得到相同的错误,只有这次是undefined local variable or method 'attr_names'
。提前致谢
答案 0 :(得分:1)
在模特身上,你应该成为self.attr_names
。或者,你所有的方法都是自我,你可以扩展自我,如下:
extend self
def attr_names
[user_id, last_name, first_name, last_name_kana, first_name_kana, created_at,created_by, updated_at, updated_by, del_flag]
end
def import(file)
spreadsheet = open_spreadsheet(file)
header = spreadsheet.row(1)
(2..spreadsheet.last_row).each do |i|
row = Hash[[header, spreadsheet.row(i)].transpose]
user = find_by(user_id: row["user_id"]) || new
user.attributes = row.to_hash.slice(*attr_names)
user.save!
end
end
def open_spreadsheet(file)
case File.extname(file.original_filename)
when ".csv" then Roo::CSV.new(file.path, csv_options: {encoding: "SJIS"})
when ".xls" then Roo::Excel.new(file.path, nil, :ignore)
when ".xlsx" then Roo::Excelx.new(file.path, nil, :ignore)
else raise "Unknown file type: #{file.original_filename}"
end
end
答案 1 :(得分:0)
试试这个
user.attributes = row.to_hash.slice(*column_names)