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class Course < ActiveRecord::Base
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include Redmine::SafeAttributes
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STATUS_ACTIVE = 1
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STATUS_CLOSED = 5
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STATUS_ARCHIVED = 9
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attr_accessible :code, :extra, :name, :state, :tea_id, :time , :location, :state, :term, :password,:is_public,:description,:class_period, :open_student, :enterprise_name
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#belongs_to :project, :class_name => 'Course', :foreign_key => :extra, primary_key: :identifier
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belongs_to :teacher, :class_name => 'User', :foreign_key => :tea_id # 定义一个方法teacher，该方法通过tea_id来调用User表
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belongs_to :school, :class_name => 'School', :foreign_key => :school_id #定义一个方法school，该方法通过school_id来调用School表
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# has_many :bid
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has_many :members, :include => [:principal, :roles], :conditions => "#{Principal.table_name}.type='User' AND #{Principal.table_name}.status=#{Principal::STATUS_ACTIVE}"
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has_many :memberships, :class_name => 'Member'
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has_many :member_principals, :class_name => 'Member',
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:include => :principal,
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:conditions => "#{Principal.table_name}.type='Group' OR (#{Principal.table_name}.type='User' AND #{Principal.table_name}.status=#{Principal::STATUS_ACTIVE})"
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has_many :principals, :through => :member_principals, :source => :principal
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has_many :users, :through => :members
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# has_many :homeworks, :through => :homework_for_courses, :source => :bid, :dependent => :destroy
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has_many :journals_for_messages, :as => :jour, :dependent => :destroy
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# has_many :homework_for_courses, :dependent => :destroy
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has_many :student, :class_name => 'StudentsForCourse', :source => :user
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has_many :course_infos, :class_name => 'CourseInfos',:dependent => :destroy
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has_many :enabled_modules, :dependent => :delete_all
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has_many :boards, :dependent => :destroy, :order => "position ASC"
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#has_many :course_journals_for_messages, :class_name => 'CourseJournalsForMessage', :as => :jour, :dependent => :destroy
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has_many :news, :dependent => :destroy, :include => :author
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has_one :course_status, :class_name => "CourseStatus", :dependent => :destroy
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has_many :homework_commons, :dependent => :destroy
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has_many :student_works, :through => :homework_commons, :dependent => :destroy
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has_many :course_groups, :dependent => :destroy
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# 课程动态
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has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
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has_many :course_activities
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# 课程消息
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has_many :course_messages, :class_name =>'CourseMessage', :as => :course_message, :dependent => :destroy
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acts_as_taggable
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acts_as_nested_set :order => 'name', :dependent => :destroy
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acts_as_attachable :view_permission => :view_course_files,
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:delete_permission => :manage_files
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validates_presence_of :password, :term,:name
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validates_format_of :class_period, :with =>/^[1-9]\d*$/
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validates_format_of :name,:with =>/^[^ ]+[a-zA-Z0-9_\u4e00-\u9fa5\s\S]+$/
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validates_length_of :description, :maximum => 10000
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before_save :self_validate
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after_create :create_board_sync, :act_as_course_activity
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before_destroy :delete_all_members
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safe_attributes 'extra',
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'time',
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'name',
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'extra',
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'code',
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'location',
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'tea_id',
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'password',
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'term',
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'is_public',
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'description',
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'class_period',
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'open_student'
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acts_as_customizable
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scope :all_course
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scope :active, lambda { where(:status => STATUS_ACTIVE) }
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scope :status, lambda {|arg| where(arg.blank? ? nil : {:status => arg.to_i}) }
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scope :all_public, lambda { where(:is_public => true) }
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scope :visible, lambda {|*args| where(Course.visible_condition(args.shift || User.current, *args)) }
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scope :allowed_to, lambda {|*args|
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user = User.current
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permission = nil
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if args.first.is_a?(Symbol)
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permission = args.shift
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else
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user = args.shift
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permission = args.shift
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end
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where(Course.allowed_to_condition(user, permission, *args))
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}
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scope :like, lambda {|arg|
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if arg.blank?
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where(nil)
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else
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pattern = "%#{arg.to_s.strip.downcase}%"
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where(" LOWER(name) LIKE :p ", :p => pattern)
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end
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}
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def visible?(user=User.current)
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user.allowed_to?(:view_course, self)
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end
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def parent_id_changed?
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false
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end
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# Returns the mail adresses of users that should be always notified on project events
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def recipients
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notified_users.collect {|user| user.mail}
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end
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# Returns the users that should be notified on project events
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def notified_users
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# TODO: User part should be extracted to User#notify_about?
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members.select {|m| m.principal.present? && (m.mail_notification? || m.principal.mail_notification == 'all')}.collect {|m| m.principal}
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end
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# 课程的短描述信息
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def short_description(length = 255)
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description.gsub(/<\/?.*?>/,"").html_safe if description
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#description.gsub(/^(.{#{length}}[^\n\r]*).*$/m, '\1...').strip if description
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end
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# 课程的短名称信息
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def short_name(length = 8)
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name.gsub(/<\/?.*?>/,"").html_safe if name
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end
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def strip_html(html)
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return html if html.empty? || !html.include?('<')
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output = ""
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tokenizer = HTML::Tokenizer.new(html)
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while token = tokenizer.next
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node = HTML::Node.parse(nil, 0, 0, token, false)
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output += token unless (node.kind_of? HTML::Tag) or (token =~ /^<!/)
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end
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return output
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end
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def extra_frozen?
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errors[:extra].blank? && !(new_record? || extra.blank?)
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end
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def archived?
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self.status == STATUS_ARCHIVED
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end
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def self.visible_condition(user, options={})
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allowed_to_condition(user, :view_course, options)
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end
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# 获取课程的资源类型列表
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def attachmenttypes
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@attachmenttypes = Attachmentstype.find(:all, :conditions => ["#{Attachmentstype.table_name}.typeId= ?",self.attachmenttype ])
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end
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# 获取资源后缀名列表
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def contenttypes
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attachmenttypes
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if @attachmenttypes.length >0
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@attachmenttypes.last().suffixArr
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end
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end
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def active?
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self.status == STATUS_ACTIVE
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end
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#课程权限判断
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def allows_to?(action)
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if archived?
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# No action allowed on archived projects
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return false
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end
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unless active? || Redmine::AccessControl.read_action?(action)
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# No write action allowed on closed projects
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return false
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end
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# No action allowed on disabled modules
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if action.is_a? Hash
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allowed_actions.include? "#{action[:controller]}/#{action[:action]}"
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else
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allowed_permissions.include? action
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end
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end
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# 课程允许的权限集合
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def allowed_permissions
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@allowed_permissions ||= begin
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module_names = enabled_modules.all(:select => :name).collect {|m| m.name}
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Redmine::AccessControl.modules_permissions(module_names).collect {|p| p.name}
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end
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end
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# 课程允许的动作集合
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def allowed_actions
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@actions_allowed ||= allowed_permissions.inject([]) { |actions, permission| actions += Redmine::AccessControl.allowed_actions(permission) }.flatten
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end
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# 返回用户组可以访问的课程
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def users_by_role
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members.includes(:user, :roles).all.inject({}) do |h, m|
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m.roles.each do |r|
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h[r] ||= []
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h[r] << m.user
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end
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h
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end
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end
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#自定义验证
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def self_validate
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end
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# 创建课程讨论区
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def create_board_sync
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@board = self.boards.build
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#self.name=" #{l(:label_borad_course) }"
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@board.name = " #{l(:label_borad_course) }"#self.name
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@board.description = self.name.to_s
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@board.project_id = -1
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if @board.save
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logger.debug "[Course Model] ===> #{@board.to_json}"
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else
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logger.error "[Course Model] ===> Auto create board when course saved, because #{@board.full_messages}"
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end
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end
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# 新增课程留言
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# add by nwb
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def self.add_new_jour(user, notes, id, options={})
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course = Course.find(id)
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if options.count == 0
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pjfm = course.journals_for_messages.build(:user_id => user.id, :notes => notes, :reply_id => 0)
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else
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pjfm = course.journals_for_messages.build(options)
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end
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pjfm.save
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pjfm
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end
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# 删除课程所有成员
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def delete_all_members
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if self.members && self.members.count > 0
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me, mr = Member.table_name, MemberRole.table_name
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connection.delete("DELETE FROM #{mr} WHERE #{mr}.member_id IN (SELECT #{me}.id FROM #{me} WHERE #{me}.course_id = #{id})")
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Member.delete_all(['course_id = ?', id])
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end
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end
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def get_endup_time
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begin
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end_time = Time.parse(self.endup_time)
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rescue Exception => e
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end_time = Time.parse("3000-01-01")
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Rails.logger.error "[Error] course endup_time error. ===> #{e}"
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ensure
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return end_time
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end
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end
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def get_time
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begin
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time = Date.new(self.time).to_time
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rescue Exception => e
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time = Time.parse("3000-01-01")
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Rails.logger.error "[Error] course time error. ===> #{e}"
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ensure
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return time
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end
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end
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def self.allowed_to_condition(user, permission, options={})
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perm = Redmine::AccessControl.permission(permission)
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base_statement = (perm && perm.read? ? "#{Course.table_name}.status <> #{Course::STATUS_ARCHIVED}" : "#{Course.table_name}.status = #{Course::STATUS_ACTIVE}")
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if perm && perm.course_module
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base_statement << " AND #{Course.table_name}.id IN (SELECT em.course_id FROM #{EnabledModule.table_name} em WHERE em.name='#{perm.course_module}')"
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end
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if options[:course]
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course_statement = "#{Course.table_name}.id = #{options[:course].id}"
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course_statement << " OR (#{Course.table_name}.lft > #{options[:course].lft} AND #{Course.table_name}.rgt < #{options[:course].rgt})" if options[:with_subcourses]
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base_statement = "(#{course_statement}) AND (#{base_statement})"
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end
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if user.admin?
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base_statement
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else
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statement_by_role = {}
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unless options[:member]
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role = user.logged? ? Role.non_member : Role.anonymous
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if role.allowed_to?(permission)
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statement_by_role[role] = "#{Course.table_name}.is_public = #{connection.quoted_true}"
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end
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end
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if user.logged?
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user.courses_by_role.each do |role, courses|
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if role.allowed_to?(permission) && courses.any?
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statement_by_role[role] = "#{Course.table_name}.id IN (#{courses.collect(&:id).join(',')})"
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end
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end
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end
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if statement_by_role.empty?
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"1=0"
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else
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if block_given?
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statement_by_role.each do |role, statement|
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if s = yield(role, user)
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statement_by_role[role] = "(#{statement} AND (#{s}))"
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end
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end
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end
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"((#{base_statement}) AND (#{statement_by_role.values.join(' OR ')}))"
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end
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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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self.course_acts << CourseActivity.new(:user_id => self.tea_id,:course_id => self.id)
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end
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#项目与课程分离后，很多课程的名称等信息为空，这些数据信息存储在项目表中！！就是数据兼容的问题
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#def name
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# read_attribute('name') || Project.find_by_identifier(self.extra).try(:name)
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#end
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end
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