这是我的方法:
def self.unique_coasters_this_year(year)
counter = 0
all.each do |c|
years = new Array
c.rode_on.each do |date, count|
years << (Date.parse date).year
end
if years.include?(year)
counter += 1
end
end
counter
end
运行时我得到这个stringify_keys错误:
oMethodError:未定义的方法
stringify_keys' for Array:Class from /Users/user/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0/gems/activerecord-3.2.12/lib/active_record/attribute_assignment.rb:69:in
assign_attributes'[97] pry(main)&gt;
知道出了什么问题吗?