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class GtopicBank < ApplicationRecord
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belongs_to :user
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belongs_to :graduation_topic, optional: true
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belongs_to :course_list, optional: true
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has_many :attachments, as: :container, dependent: :destroy
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has_many :graduation_topics, dependent: :nullify
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scope :myself, ->(user_id) { where(user_id: user_id)}
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# 课题名称和描述字段长度限制
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validates :name, length: { maximum: 60, too_long: "不能超过60个字符" }
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validates :description, length: { maximum: 5000, too_long: "不能超过5000个字符" }
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end
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