Question

我尝试按此处执行可排序的列：#228 Sortable Table

型号： person.rb

# Table name: people
#
#  id                         :integer          not null, primary key
#  first_name                 :string           not null
#  last_name                  :string           not null

individual_traning.rb

# Table name: individual_trainings
#
#  id               :integer          not null, primary key
#  date_of_training :date             not null
#  client_id        :integer
#  trainer_id       :integer

协会： person.rb

  has_many :individual_trainings_as_trainer,
           class_name: 'IndividualTraining',
           foreign_key: 'trainer_id'
  has_many :individual_trainings_as_client,
           class_name: 'IndividualTraining',
           foreign_key: 'client_id'

individual_training.rb

  belongs_to :trainer, class_name: 'Person', foreign_key: 'trainer_id'
  belongs_to :client, class_name: 'Person', foreign_key: 'client_id'

individual_trainings_controller.rb

def index
    @individual_trainings = IndividualTraining.includes(:training_cost)
                                              .includes(:client)
                                              .order(sort_column + ' ' + sort_direction)
                                              .references(:training_costs)
                                              .references(:clients)
end

JOINED_TABLE_COLUMNS = %w(training_costs.cost training_costs.duration
                            clients.first_name).freeze
  def sort_column
    if JOINED_TABLE_COLUMNS.include?(params[:sort]) || IndividualTraining.column_names.include?(params[:sort])
      params[:sort]
    else
      'date_of_training'
    end
  end

  def sort_direction
    %w(asc desc).include?(params[:direction]) ? params[:direction] : 'asc'
  end

问题：在视野中我使用例如可排序的“clients.first_name”有这样的错误：

 PG::UndefinedTable: ERROR:  missing FROM-clause entry for table "clients"
LINE 1: ...d" = "individual_trainings"."client_id"  ORDER BY clients.fi...

我在多个关联上使用了sortable，一切正常。我认为问题在于belongs_to的自定义名称（而不是一个belongs_to：people）。任何人都知道为什么我的解决方案不正确？

在关联模型上获取可排序列的问题

0 个答案: