我正在导入 CSV 并使用 ActiveRecord 创建行。 CSV 是:
first_name,middle_name,last_name,degrees,email,induction_year (ie 2017),"induction_type (options: alumni, associate, faculty, honorary, student)"
John,Middle,Doe,"BA, MPH",test@test.com,2017,alumni
我的导入方法如下所示:
def import
CSV.foreach(@file.path, headers: true, header_converters: lambda {|field| field.partition(" ").first }, col_sep: ',') do |row|
member_params = row.to_hash
Member.create!(member_params)
end
end
但它会抛出 ActiveModel::UnknownAttributeError: unknown attribute 'first_name' for Member.
编辑:这不是 Member 的问题,我可以像你期望的那样创建 Member,比如 Member。创建!(名字:'测试')
打开 pry 棒,我得到了这样的反馈:
[1] pry(#<InducteesUpload>)> member_params
=> {"first_name"=>"John",
"middle_name"=>"Middle",
"last_name"=>"Doe",
"degrees"=>"BA, MPH",
"email"=>"test@test.com",
"induction_year"=>"2017",
"induction_type"=>"alumni"}
[2] pry(#<InducteesUpload>)> member_params.keys.first == "first_name"
=> false
[3] pry(#<InducteesUpload>)> member_params.keys.first.encoding
=> #<Encoding:UTF-8>
添加更多:
[1] pry(#<InducteesUpload>)> member_params.keys
=> ["first_name",
"middle_name",
"last_name",
"degrees",
"email",
"induction_year",
"induction_type"]
[2] pry(#<InducteesUpload>)> member_params["first_name"] = "test"
=> "test"
[3] pry(#<InducteesUpload>)> member_params
=> {"first_name"=>"John",
"middle_name"=>"Middle",
"last_name"=>"Doe",
"degrees"=>"BA, MPH",
"email"=>"test@test.com",
"induction_year"=>"2017",
"induction_type"=>"alumni",
"first_name"=>"test"}
这不是 Member 的问题,正如您从上面的怪异现象中看到的那样。但如果你真的想要,我会发布。
所以这里揭示了问题:
[6] pry(#<InducteesUpload>)> member_params.keys.first.bytes
=> [239, 187, 191, 102, 105, 114, 115, 116, 95, 110, 97, 109, 101]
[7] pry(#<InducteesUpload>)> "first_name".bytes
=> [102, 105, 114, 115, 116, 95, 110, 97, 109, 101]
最佳答案
我打赌 unicode 魔术。比较 member_params.keys.first.bytes
和 "first_name".bytes
。您可能会发现不同之处。
Unicode 有很多符号看起来很相似,但彼此并不相等。
关于ruby-on-rails - 出现相同的 Ruby 字符串不相等,为什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42720367/