ruby-on-rails - 如何在 Rails 3 中获取数组元素

Question

我在 rails 3 中有一个像这样的数组 [["SWD", "150325006"], ["GOODS", "150325006"]]。我想获取那些类型为“SWD”。请检查下面我的代码。

payment_controller.rb

class PaymentsController < ApplicationController

    def payment
        @payment=Vendor.new
        respond_to do |format|
            format.html 
            format.js
        end

    end
    def check_type  
        if params[:commit]=="submit"
            @vendor_type = PaymentVendor.where(:v_name => params[:v_name]).map{|v|[v.v_catagory ,v.Receipt_No]}
            #@vendor_type = PaymentVendor.where(:v_name => params[:v_name]).pluck(:v_catagory)


        else
            @v_name=Vendor.where(:s_catagory => params[:payment][:s_catagory] ).pluck(:v_name)
        end
    end
end

@vendor_type 给出的值如下 [["SWD", "150325006"], ["GOODS", "150325006"]]。请帮助我。

Answer 1

您可以使用 assoc :

array = [["SWD", "150325006"], ["GOODS", "150325006"]]

array.assoc('SWD').last    
#=> "150325006"