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26 lines
641 B
26 lines
641 B
module Watchable
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extend ActiveSupport::Concern
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included do
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has_many :watchers, as: :watchable, dependent: :destroy # 关注我的
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has_many :watcher_users, through: :watchers, source: :user, validate: false # 我的粉丝
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scope :watched_by, -> (user_id) { includes(:watchers).where(watchers: { user_id: user_id }) }
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end
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def watched?(watchable)
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watchable.watchers.exists?(user: self)
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end
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def watch!(user)
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user.watchers.create!(user: self)
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end
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def unwatch!(user)
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obj = user.watchers.find_by(user: self)
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obj.destroy! if obj.present?
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end
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module ClassMethods
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end
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end |