Question

进展：

#== Schema Information
#
# Table name: progresses
#
#  id         :integer         not null, primary key
#  width      :integer         default(0)
#  course_id  :integer         not null
#  created_at :datetime        not null
#  updated_at :datetime        not null
#

class Progress < ActiveRecord::Base
    has_many:progress_comments
    belongs_to:course
end

课程：

# == Schema Information
#
# Table name: courses
#
#  id         :integer         not null, primary key
#  courseName :string(50)      not null
#  place      :string(100)     not null
#  startTime  :datetime        default(2012-02-10 00:39:52 UTC)
#  endTime    :datetime
#  teacher    :string(20)      default("nil_teacher")
#  reason     :text            not null
#  upNum      :integer         default(0)
#  downNum    :integer         default(0)
#  day        :integer         not null
#  school_id  :integer         not null
#  created_at :datetime        not null
#  updated_at :datetime        not null
#

class Course < ActiveRecord::Base
    #attr_acessssible:
    #validates :courseName, presence: true
    has_many:remarks
    has_many:reviews
    has_one:progress
    has_and_belongs_to_many:course_catagories
    belongs_to:school
end

虽然我想通过
创造进步 Course.first.progress.create(...)
它出现在rails控制台中：
undefined method 'create' for nil:NilClass
有人得到一些想法吗？谢谢

Answer 1

尝试使用Course.first.create_progress(...); progress.create格式适用于多个关联，例如has_many。

rails has_one创建错误

1 个答案: