1.try 永远不会抛出异常 在 没有的时候 返回 nil
复制代码 代码如下:
province_id = Province.find_by_name(prov).try(:id) 

2.find(:first, :condotions) 方法 不言而与
复制代码 代码如下:
mobile_info = MobileInfo.find(:first, :conditions => ["mobile_num = ", mobile_num.to_i]) 

3.find(:all, :select, :conditions)
复制代码 代码如下:
support_amount_a = ProvinceMerchantChangeValue.find(:all, :select => "DISTINCT change_value_id", 
                        :conditions => ["status = 1 and merchant_id = ", 
                        merchant_id, province_id]).map { |cv| cv.change_value_id }.compact 
 
support_amount_s = ChangeValue.find(:all,:select => "price" ,:conditions => ["id in (", support_amount_a]) \ 
                                  .map { |cv| cv.try(:price).to_i }.compact 

4.发送post请求 可以在shell中执行 

复制代码 代码如下:
curl -d "channel=中信异度支付&action_type=娱人节-手机充值&user_indicate=13911731997&original_amount=10000" http://xx.xxx.xxx:3000/search.json 

5.Ruby 中纯数据结构 ( Struct 与 OpenStruct )

讲一下它俩之间的区别:

Struct 需要开头明确声明字段; 而 OpenStruct 人如其名, 随时可以添加属性
Struct 性能优秀; 而 OpenStruct 差点, 具体的性能差距可看这里:http://stackoverflow.com/questions/1177594/ruby-struct-vs-openstruct
Struct 是 Ruby 解释器内置, 用 C 实现; OpenStruct 是 Ruby 标准库, Ruby 实现
API 不同: Struct API 与 OpenStruct

6. MIme::Type.register

复制代码 代码如下:
Mime::Type.register "application/json", :ejson 
config/initializers/mime_types.rb

7.config/initializers/secure_problem_solved.rb
复制代码 代码如下:
ActiveSupport::CoreExtensions::Hash::Conversions::XML_PARSING.delete('symbol') 
ActiveSupport::CoreExtensions::Hash::Conversions::XML_PARSING.delete('yaml') 

8.config/initializers/new_rails_default.rb
复制代码 代码如下:
if defined"codetitle">复制代码 代码如下:
@_cache = ActiveSupport::Cache::MemCacheStore.new(
                      CONFIG['host'], { :namespace => "#{CONFIG['namespace']}::#{@name}" }
                      )

localhost::callback_lock

@_cache.write(pay_channel.channel_id,'true')
v = @_cache.read(pay_channel.channel_id)
if v.nil"codetitle">复制代码 代码如下:
gem 'composite_primary_keys', '6.0.1'

https://github.com/momoplan

0.Hash assert_valid_keys 白名单

11.puma -C puma_service_qa.rb

12.pow

13. Time

复制代码 代码如下:
start_time = start_time.to_s.to_datetime.at_beginning_of_day
end_time = end_time.to_s.to_datetime.end_of_day

14.merchant.instance_of"codetitle">复制代码 代码如下:
m_order[:merchant_id] = (merchant.instance_of"codetitle">复制代码 代码如下:
require 'will_paginate'
修改controller文件中的index方法：
#    @products = Product.find(:all)
    @products = Product.paginate  :page => params[:page],
                                  :per_page => 2
  .pagination
    = will_paginate @mplus_orders, :class => 'digg_pagination'