1.try 永远不会抛出异常 在 没有的时候 返回 nil
2.find(:first, :condotions) 方法 不言而与
3.find(:all, :select, :conditions)
4.发送post请求 可以在shell中执行
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
7.config/initializers/secure_problem_solved.rb
8.config/initializers/new_rails_default.rb
# store the full class name (including module namespace) in sti type column.
activerecord::base.store_full_sti_class = true
end
actioncontroller::routing.generate_best_match = false
# use iso 8601 format for json serialized times and dates.
activesupport.use_standard_json_time_format = true
# don't escape html entities in json, leave that for the #json_escape helper.
# if you're including raw json in an html page.
activesupport.escape_html_entities_in_json = false
9.memcachestore 缓存
localhost::callback_lock
@_cache.write(pay_channel.channel_id,'true')
v = @_cache.read(pay_channel.channel_id)
if v.nil? || v != 'true'
return false
else
return true
end
end
10.联合索引
https://github.com/momoplan
0.hash assert_valid_keys 白名单
11.puma -c puma_service_qa.rb
12.pow
13. time
14.merchant.instance_of? mplusmerchant
15.will_paginate rails
安装之后需要修改config/environment.rb文件
在文件的最后添加:
最好有个include
16. # excel generator
month = 1.upto(12).to_a
def self.total_to_xls(year = '2012', opts = {})
book = spreadsheet::workbook.new
sheet1 = book.create_worksheet
months = month
months = opts[:month].to_s.split(/,/) if opts[:month]
fixed_row = months.collect{ |m| m.to_s + '月' }.insert(0, '')
sheet1.row(0).concat(fixed_row)
row1 = ['']
(months.size - 1).times { row1 << ['用户数', '金额', '订单数'] }
sheet1.row(1).concat(row1.flatten!)
row = 2
sheet1.row(row).insert(0, '全国')
months.each_with_index do |m, i|
sheet1.row(row).insert(i*3 + 1, self.monthly_users_count(m))
sheet1.row(row).insert(i*3 + 2, self.monthly_amount(m))
sheet1.row(row).insert(i*3 + 3, self.monthly_orders_count(m))
end
province.each do |province|
row += 1
sheet1.row(row).insert(0, province)
months.each_with_index do |m, i|
sheet1.row(row).insert(i*3 + 1, self.monthly_users_count_by_province(m, province))
sheet1.row(row).insert(i*3 + 2, self.monthly_amount_by_province(m, province))
sheet1.row(row).insert(i*3 + 3, self.monthly_orders_count_by_province(m, province))
end
end
path = "tmp/phone_recharge.xls"
book.write path
path
end
17. inject({})
18.time_str.instance_of?
19.person.instance_eval
20.class_eval
21.ruby中 respond_to? 和 send 的用法
http://galeki.is-programmer.com/posts/183.html
因为obj对象没法响应talk这个消息,如果使用 respond_to? 这个方法,就可以实现判断对象能否响应给定的消息了
22.method_missing,一个 ruby 程序员的梦中情人
23.chomp
chomp方法是移除字符串尾部的分离符,例如\n,\r等...而gets默认的分离符是\n
24. hash.each_pair{|k,v|} & send()
25.config.middleware 通过 rake -t 可以查看, 在config/ - 去除不必的 middleware
26.1.day.ago.strftime('%y%m%d')
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自动化部署Ruby on Rails应用(docker + jenkins)
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