1.try 永远不会抛出异常 在 没有的时候 返回 nil
province_id = Province.find_by_name(prov).try(:id)
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2.find(:first, :condotions) 方法 不言而与
mobile_info = MobileInfo.find(:first, :conditions => ["mobile_num = ? ", mobile_num.to_i])
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3.find(:all, :select, :conditions)
support_amount_a = ProvinceMerchantChangeValue.find(:all, :select => "DISTINCT change_value_id",
:conditions => ["status = 1 and merchant_id = ? and province_id =? and channel_id in (select id from channels where status = 1)",
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
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4.发送post请求 可以在shell中执行
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
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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
Mime::Type.register "application/json", :ejson
config/initializers/mime_types.rb
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7.config/initializers/secure_problem_solved.rb
ActiveSupport::CoreExtensions::Hash::Conversions::XML_PARSING.delete('symbol')
ActiveSupport::CoreExtensions::Hash::Conversions::XML_PARSING.delete('yaml')
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8.config/initializers/new_rails_default.rb
if defined?(ActiveRecord)
# Include Active Record class name as root for JSON serialized output.
ActiveRecord::Base.include_root_in_json = true
# 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
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9.MemCacheStore 缓存
@_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? || v != 'true'
return false
else
return true
end
end
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10.联合索引
gem 'composite_primary_keys', '6.0.1'
https://github.com/momoplan
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0.Hash assert_valid_keys 白名单
11.puma -C puma_service_qa.rb
12.pow
13. Time
start_time = start_time.to_s.to_datetime.at_beginning_of_day
end_time = end_time.to_s.to_datetime.end_of_day
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14.merchant.instance_of? MplusMerchant
m_order[:merchant_id] = (merchant.instance_of? MplusMerchant) ? merchant.id : merchant
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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：
require 'will_paginate'
修改controller文件中的index方法：
# @products = Product.find(:all)
@products = Product.paginate :page => params[:page],
&nbs