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class HomeworkBank < ApplicationRecord
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# homework_type: 1：普通作业 2：编程作业（弃用） 3：分组作业 4：实训作业
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belongs_to :course_list
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belongs_to :homework_common, optional: true
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belongs_to :user
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has_many :attachments, as: :container, :dependent => :destroy
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has_many :homework_commons, dependent: :nullify
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scope :is_public, -> { where(is_public: true)}
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scope :myself, ->(user_id) { where(user_id: user_id)}
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validates :name, length: { maximum: 500, too_long: "不能超过500个字符" }
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validates :description, length: { maximum: 66000, too_long: "不能超过500个字符" }
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validates :reference_answer, length: { maximum: 66000, too_long: "不能超过500个字符" }
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end
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