Rails 4 ArgumentError - 參數數量錯誤

我正在學習rails通過教程進行高級搜索，其中用戶可以根據類別找到帖子。但不知何故，我的高級頁面給我這個錯誤：Rails 4 ArgumentError - 參數數量錯誤

ArgumentError in Searches#new Showing app/views/searches/new.html.haml where line #10 raised:

wrong number of arguments (3 for 1..2)

上，我得到的錯誤是該行：

= s.text_field :category, options_for_select(@categories), :include_blank => true

上述文件是new.html.haml（10號線）。這裏是搜索controller.rb，我認爲new方法中的@categories是不正確的。

class SearchesController < ApplicationController 

    def new 
     @search = Search.new 
     @categories = Idea.uniq.pluck(:category) 
    end 

    def create 
     @search = Search.create(search_params) 
     redirect_to @search 
    end 

    def show 
     @search = Search.find(params[:idea_id]) 
    end 

    private 

    def search_params 
     params.require(:search).permit(:keywords, :category) 
    end 

end

而且我model.rb

class Search < ActiveRecord::Base 

    def search_ideas 
     ideas = Idea.all 

     ideas = ideas.where(["title LIKE ?","%#{keywords}%"]) if keywords.present? 
     ideas = ideas.where(["category LIKE ?","%#{category}%"]) if category.present? 

     return ideas 
    end 

end

我試圖用collection_select，而不是s.text_field但它仍然給了我這個錯誤。

來源

2016-02-01 hassanyf

嘗試使用s.select這樣的：

= s.select :category, options_for_select(@categories), :include_blank => true

來源

2016-02-01 06:23:18

讓指documentation第一。

select(object, method, choices = nil, options = {}, html_options = {}, &block)

因爲它有兩個哈希選項，所以你需要指定optionshtml_options前

s.select :category, options_for_select(@categories), {}, {include_blank: true}

來源

2016-02-01 07:17:09

Rails 4 ArgumentError - 參數數量錯誤

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