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# status 0：待选中 1：待确认 2：已确认
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class GraduationTopic < ApplicationRecord
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belongs_to :course, counter_cache: true
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belongs_to :user
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has_many :student_graduation_topics, :dependent => :destroy
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# 附件
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#acts_as_attachable
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has_many :attachments, as: :container, dependent: :destroy
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# 回复
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has_many :journals_for_messages, :as => :jour, :dependent => :destroy
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# 题库
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scope :search_by_name, ->(name) { where("graduation_topics.name LIKE ?", "%#{name}%")}
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scope :search_by_status, ->(status) {where(status: status)}
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#after_create :act_as_course_activity
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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,
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too_long: "60 characters is the maximum allowed" }
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validates :description, length: { maximum: 5000,
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too_long: "5000 characters is the maximum allowed" }
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def status_name
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case self.status
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when 0
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"待选中"
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when 1
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"待确认"
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when 2
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"已确认"
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else
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"状态错误！"
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end
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end
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#课程动态公共表记录
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def act_as_course_activity
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if self.course
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if self.course_acts.size == 0
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self.course_acts << CourseActivity.new(:user_id => self.user_id, :course_id => self.course_id)
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end
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end
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end
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# 跟选题后，查询所有选题的状态
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def student_graduation_topic_status
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sgt = self.student_graduation_topics
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status =
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if sgt.is_accepting.count == 0
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2
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elsif sgt.is_refused.count == self.student_graduation_topics.size
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0
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else
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1
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end
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return status
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end
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def teacher
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User.find(self.tea_id)
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end
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# 用户选题的状态
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def user_status(user_id)
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self.student_graduation_topics.where(user_id: user_id).last.try(:status)
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end
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end
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