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class EcYear < ApplicationRecord
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belongs_to :ec_major_school
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# 课堂配置
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has_many :ec_courses, dependent: :destroy
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has_many :ec_course_targets, through: :ec_courses
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has_one :ec_training_objective, dependent: :destroy
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has_many :ec_training_subitems, through: :ec_training_objective
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has_many :ec_graduation_requirements, dependent: :destroy
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has_many :ec_graduation_subitems, through: :ec_graduation_requirements
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has_many :ec_year_students, dependent: :destroy
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has_many :ec_course_users, dependent: :destroy
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has_many :managers, through: :ec_course_users, source: :user
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def prev_year
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self.class.find_by(year: year.to_i - 1)
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end
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end
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