51 lines
1.3 KiB
Ruby
51 lines
1.3 KiB
Ruby
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class MessagesForUser < ActiveRecord::Base
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attr_accessible :message, :messager_id, :user_id
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belongs_to :user
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MESSAGE_LENGTH_LIMIT = 60
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validate :validate_user
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validate :validate_messager
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validates_presence_of :messager_id, :user_id, :message
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validates_length_of :message, :maximum => MESSAGE_LENGTH_LIMIT
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def self.leave_message(messager_id, user_id, message)
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unless messager_id == user_id
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@messages_for_user = self.new
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@messages_for_user.messager_id = messager_id
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@messages_for_user.user_id = user_id
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@messages_for_user.message = message
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@messages_for_user.save
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true
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else
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false
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end
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end
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def self.find_message(user_id)
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user = User.find(user_id)
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@message_table_for_user = user.messages_for_users.to_a
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@message_table_for_user
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end
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def find_messager
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@messager = User.where(:id =>messager_id)
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@messager
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end
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def self.delete_message(message_id)
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MessagesForUser.delete_all "id = #{message_id}"
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end
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#验证user是否存在
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def validate_user
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errors.add :user_id, :invalid if user.nil? || !user.active?
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end
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#验证messager是否存在
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def validate_messager
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user = User.where("id = ?", messager_id).to_a.first
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errors.add :messager_id, :invalid if user.nil? || !user.active?
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end
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end
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