Question

我无法弄清楚这个非常简单的错误：

xyz_controller.rb:
    @isbn = params[:q]
    @search_type = params[:search_type]
... 
    @prices = Generalsearch.new(:search_term => @isbn, :search_type => @search_type)

generalsearch.rb

    attr_accessor :search_term , :search_type
    def initialize(search_term , search_type)
      self.search_term= search_term
      self.search_type= search_type
    end
...

我一直在

wrong number of arguments (1 for 2)
app/models/generalsearch.rb:11:in `initialize'
app/controllers/book_controller.rb:47:in `new'
app/controllers/book_controller.rb:47:in `view'

Answer 1

你只传递一个参数，即在Generalsearch.new（）

中散列:search_term => @isbn, :search_type => @search_type

使用

Generalsearch.new( @isbn, @search_type)

Answer 2

你必须使用，因为你在初始化函数上接受2个参数，而不是参数的散列。

@prices = Generalsearch.new(@isbn, @search_type)

Answer 3

如果你想使用

Generalsearch.new(:search_term => @isbn, :search_type => @search_type)

然后你可以使用initialize方法

def initialize(options)
  # You can also use options[:search_term], 
  # but fetch lets you know if the key doesn't exist
  self.search_term= options.fetch(:search_term) 
  self.search_type= options.fetch(:search_type)
end

错误的参数数量 - 在initialize方法中

3 个答案: