我想在没有先转换为JSON的情况下将额外的字段添加到查询的结果中。Rails 4.2.6为activerecord元素添加额外的属性
我有3种型号team
,tournament
和match
,有如下关系:
class Match < ActiveRecord::Base
belongs_to :homeTeam, class_name: "Team", foreign_key: "localTeam"
belongs_to :awayTeam, class_name: "Team", foreign_key: "visitorTeam"
class Team < ActiveRecord::Base
has_many :local_matches, class_name: "Match", foreign_key: "localTeam"
has_many :visitor_matches, class_name: "Match", foreign_key: "visitorTeam"
class Tournament < ActiveRecord::Base
has_many :matches, class_name:"Match",foreign_key: "tournamentId"
在Tournament
类,我想增加一个功能,这将使我在所有比赛的名单tournamet,但是对于每场比赛,它应该包含来自其中的一些数据(主队和客场球队)。
我想以下几点:
def tournament_matches
matches= self.matches
matches.each do |match|
match[:home_team_logo] = match.homeTeam.logo //add this field
match[:visitor_team_logo] = match.awayTeam.logo //add this field
end
matches.group_by(:round)
end
但我得到一个错误:
ActiveModel::MissingAttributeError: can't write unknown attribute 'local_team_name'
我能做些什么,这样我可以从Team
我ActiveRecord::Associations::CollectionProxy
Match
类元素添加额外的字段在回报?请记住,Team.logo
是一个函数,而不是一个属性。