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Confidential Exploring ActiveRecord Leon Confidential

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2 Agenda Ø Preface ü Beauty Of Mathematics Ø Metadata ü Reflection; Association; Attribute Ø Hierarchies ü Scoping Ø Wrapping Up

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Introduction

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4 FreeWheel是做什么的？ 目前90%美国主流电视媒体和运营商使用我们的广告平台。 2014年，我们服务的视频播放超过1250亿次。

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5 MRM－FreeWheel的旗舰产品 Monetization Rights Management®

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6 FreeWheel的客户

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ORM Preface

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8 归类 Ø 现有煤气灶、水龙头、水壶和火柴摆在您面前，需要烧水时，须进行如下 操作： ü 往水壶里注满水，点燃煤气，把水壶放到煤气灶上。 Ø 假设现在水壶中的水是满的，其他情况不变，又该怎样去做？ ü 物理学家的答案：“点燃煤气，再把水壶放上去。” ü 数学家的答案：“只须把水壶中的水倒掉，问题就化归为前面所说的 问题了。”

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9 Ø Hibernate (JAVA) Ø Entity Framework (C#) Ø SQLBoiler (Golang) Ø Django (Python) Ø ActiveRecord (Ruby)

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Real Life Gem

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11 Real-life Case: Brand New Copy

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12 Tasks Split Up Ø Data Structure: ü Association; Reflection; Attribute; Graph Ø Algorithm ü Graph copy ü Topology sort ü Priority queue Ø Detail is evil !!

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13 ActiveRecord Hierarchies

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ActiveRecord Metadata

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15 Beauty Of Mathematics

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16 Metaphor For Input & Output

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17 What's Metadata? - Compiler

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18 What's Metadata? - Association

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19 Association & Reflection Ø Reflection ü Host; Options Ø Association: ü Owner ü Reflection ü Target

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21 Builder & Reflection & Association

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22 What's Metadata? - Attribute

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23 Attribute Ø Attribute: two dimensions ü Type • data type; SQL type • casting from/to database type ü Value • Accessor for business model

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25 Attribute Accessor

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ActiveRecord Hierarchies

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27 Hierarchies

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28 Scoping Ø Scope Ø Relation Ø Scope vs. Relation Ø Relation vs. Arel

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29 Scope

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30 Relation

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31 Nested Scopes Combined Relation

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32 Default Scope Combined Relation

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Wrapping Up & Abstraction

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35 Summary Ø Functionalities ü Metadata Management ü Accessor Methods Generation ü Scoping && Relation Ø Design ü Meta Programming ü Multiple Layers Design For Single Responsibility ü Interface Over Implementation Ø Program = Data Structure + Algorithm

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Confidential THANKS