未定義的方法`boarding_eq'的Ransack ::搜索<class：School，base：Grouping <combinator：and >>：Ransack ::搜索

Question

我有一個奇怪的錯誤與ransack。它返回錯誤

undefined method `boarding_eq' for Ransack::Search<class: School, base: Grouping <combinator: and>>:Ransack::Search 

for;

<div class="form-group col-xs-6 pull-left"> 
     <%= f.label :boarding_eq, " Boarding Facilities", class: 'search-label ' %> 
     <%= f.select :boarding_eq, options_for_select(["","Yes", "No"]), class: 'form-control col-xs-12' %>  
</div>    

然而，它適用於所有其他輸入，如;

<div class="form-group col-xs-6 pull-left"> 
    <%= f.label :year_of_establishment_eq, " Boarding Facilities", class: 'search-label ' %> 
    <%= f.select :year_of_establishment_eq, options_for_select(["","Yes", "No"]), class: 'form-control col-xs-12' %>  
</div>      

學校模型看起來像這樣;

class School < ActiveRecord::Base 

    attr_accessible :about, :academic_level, :country, :boarding, :district_or_province, 
        :email_address, :fees, :gender, :information_technology, :number_of_students, 
        :performing_arts, :phone_number, :photo_1, :photo_2, :photo_3, :photo_4, 
        :photo_5, :physical_address, :post_address, :school_name, :sports, :town, 
        :web_address, :year_of_establishment 

    validates :about, :academic_level, :country, :boarding, :district_or_province, 
        :email_address, :gender, :information_technology, :number_of_students, 
        :performing_arts, :phone_number, :physical_address, :post_address, :school_name, 
        :sports, :town, presence: true 

    validates :email, :with => /\A[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]+\z/, uniqueness:true 

    validates :phone_number, uniqueness:true, numericality: true, length: {minimum: 12}    

    belongs_to :user 

    has_many :school_events 

    has_many :school_reviews 

    has_many :votes 

    has_one :rating 

end 

和模型遷移如下;

class CreateSchools < ActiveRecord::Migration 
    def change 
    create_table :schools do |t| 
     t.integer :user_id 
     t.string :school_name 
     t.integer :year_of_establishment 
     t.string :number_of_students 
     t.string :academic_level 
     t.string :phone_number 
     t.string :email_address 
     t.string :web_address 
     t.text :physical_address 
     t.integer :post_address 
     t.string :country 
     t.string :district_or_province 
     t.string :town 
     t.text :about 
     t.string :fees 
     t.string :sports 
     t.string :information_technology 
     t.string :performing_arts 
     t.string :gender 
     t.string :boarding 
     t.text :photo_1 
     t.text :photo_2 
     t.text :photo_3 
     t.text :photo_4 
     t.text :photo_5 

     t.timestamps 
    end 
    add_index :schools, [:user_id, :year_of_establishment] 
    add_index :schools, [:school_name, :number_of_students] 
    add_index :schools, [:academic_level, :country ] 
    add_index :schools, [ :district_or_province, :fees ] 
    add_index :schools, [:boarding, :gender ]      
    end 
end 

我已經添加了學校模型和學校遷移。

Answer 1

問題是，雖然我更改了遷移以反映：登機，但保留了以前設置的列。