SUGCON 2015 Modelling
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The document discusses different patterns for modeling data in Sitecore applications, including active record, data mapper, and wrapper patterns. It notes pros and cons of each pattern, such as active record being simple to use but difficult to test. Common problems with domain models like anemic, bloated, skinny, and indiscreet models are also covered. The document concludes with an overview of techniques like interface models, template models, rendering models, and MVC/MVP patterns.
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Sitecore User Group Conference 2015 69Sitecore User Group Conference 2015 69
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SUGCON 2015 Modelling
- 1. Glass V4, More Info For Your Solution Mike Edwards Glass @mikeedwards83 @glasslu Sitecore User Group Conference 2015 1
- 2. Glass V4, More Info For Your Solution Modeling Mike Edwards Glass @mikeedwards83 @glasslu Sitecore User Group Conference 2015 2
- 3. Hello! Sitecore User Group Conference 2015 3 Mike Edwards Sitecore MVP @mikeedwards83 @glasslu
- 4. Modelling Sitecore User Group Conference 2015 4 NOT THIS KIND
- 5. Modelling Sitecore User Group Conference 2015 5 THIS KIND
- 6. Modelling • Different Patterns • Common Mistakes • Techniques Sitecore User Group Conference 2015 6
- 7. Common Patterns • Active Record • Data Mapping • Wrapping Sitecore User Group Conference 2015 7
- 8. Active Record Pattern In software engineering, the active record pattern is an architectural pattern found in software that stores in-memory object data in relational databases. The interface of an object conforming to this pattern would include functions such as Insert, Update, and Delete. - Wiki, Martin Fowler Sitecore User Group Conference 2015 8
- 9. Active Record Pattern Sitecore User Group Conference 2015 9 The Example
- 10. Active Record Pattern - Pro’s Simple to use: Sitecore User Group Conference 2015 10
- 11. Active Record Pattern - Pro’s Simple to pass around: Sitecore User Group Conference 2015 11
- 12. Hidden side effects: Active Record Pattern - Con’s Sitecore User Group Conference 2015 12 Surprise!! Pointless
- 13. Active Record Pattern - Cons Coupled to data source: Sitecore User Group Conference 2015 13
- 14. Active Record Pattern - Con’s Complex: Sitecore User Group Conference 2015 14
- 15. Active Record Pattern - Con’s Hard to test: Sitecore User Group Conference 2015 15 How do we mock this?? Ask the FakeDB Guys
- 16. Data Mapper Pattern Data Mapper is a Data Access Layer that performs bidirectional transfer of data between a persistent data store (often a relational database) and an in memory data representation (the domain layer). The goal of the pattern is to keep the in memory representation and the persistent data store independent of each other and the data mapper itself. - Wiki, Martin Fowler Sitecore User Group Conference 2015 16
- 17. Data Mapper Pattern Sitecore User Group Conference 2015 17 The Example
- 18. Data Mapper Pattern Sitecore User Group Conference 2015 18 The Example
- 19. Data Mapper Pattern Sitecore User Group Conference 2015 19 The Example
- 20. Data Mapper Pattern Simple Models Sitecore User Group Conference 2015 20
- 21. Data Mapper Pattern - Pro’s Easy Testing Sitecore User Group Conference 2015 21
- 22. Data Mapper Pattern - Pro’s Clear Separation Sitecore User Group Conference 2015 22 My World Their World
- 23. Data Mapper Pattern - Pro’s Store Anywhere Sitecore User Group Conference 2015 23
- 24. Data Mapper Pattern - Pro’s Clear Control Sitecore User Group Conference 2015 24 Hello!!
- 25. Data Mapper Pattern - Con’s Map Unused Data Sitecore User Group Conference 2015 25
- 26. Data Mapper Pattern - Con’s Expensive Upfront Sitecore User Group Conference 2015 26
- 27. Data Mapper Pattern - Con’s Disconnection from source Sitecore User Group Conference 2015 27 Where the hell did you come from?
- 28. Wrappers Models Wraps the underlying data source and converts the data on demand. The internal model contains a reference to the original data source which it uses to perform data conversion. Sitecore User Group Conference 2015 28
- 29. Wrappers Models Sitecore User Group Conference 2015 29
- 30. Wrappers Models - Pro’s Cheap Up Front Sitecore User Group Conference 2015 30 No work done here! Only accessed properties require conversion.
- 31. Wrappers Models - Pro’s Hidden State Changes Sitecore User Group Conference 2015 31 What happens if this changes
- 32. Wrappers Models - Pro’s Hidden State Changes Sitecore User Group Conference 2015 32 Are these the same?
- 33. Wrappers Models - Con’s Testing Difficulty Sitecore User Group Conference 2015 33 Can’t test because of this. Have to write data conversion code Need to understand this
- 34. Wrappers Models - Meet my partner Coupling Sitecore User Group Conference 2015 34 I ask for this
- 35. Wrappers Models - Meet my partner Coupling Sitecore User Group Conference 2015 35 I get this
- 36. Common Problems • Anemic domain model • Bloated domain model • Skinny domain model • Indiscreet domain model Sitecore User Group Conference 2015 36
- 37. Anemic Domain Model Anemic domain model is the use of a software domain model where the domain objects contain little or no business logic (validations, calculations, business rules etc). - Wiki, Martin Fowler Sitecore User Group Conference 2015 37
- 38. Anemic Domain Model - Example Sitecore User Group Conference 2015 38 Feed Me!!
- 39. Anemic Domain Model Sitecore User Group Conference 2015 39
- 40. Bloated Domain Model A Bloated Domain Model is the use of a software domain model that contains a large number of properties that are never access or required by the application. - Mike E Sitecore User Group Conference 2015 40
- 41. Bloated Domain Model Sitecore User Group Conference 2015 41
- 42. Bloated Domain Model Fixed Sitecore User Group Conference 2015 42
- 43. Skinny Domain Model A Skinny Domain Model is the use of a software domain model that contains one or very few properties. - Mike Sitecore User Group Conference 2015 43
- 44. Skinny Domain Model Skinny Domain model Sitecore User Group Conference 2015 44
- 45. Skinny Domain Model Fixed Sitecore User Group Conference 2015 45 USE THE RAW API!
- 46. Indiscreet Domain Model A Indiscreet Domain Model is the use of a software domain model that exposes all it’s properties publically even if they should or should not be accessed by external code. - Mike E Sitecore User Group Conference 2015 46
- 47. Indiscreet Domain Model Sitecore User Group Conference 2015 47
- 48. Indiscreet Domain Model Fixed Sitecore User Group Conference 2015 48
- 49. Techniques Sitecore User Group Conference 2015 49 • Interface Models • Template Models • Rendering Models • MVC • MVP
- 50. Interface Models Sitecore User Group Conference 2015 50 Domain models defined using interfaces only. Interface are dynamically implemented at run time using a proxy framework.
- 51. Interface Models Sitecore User Group Conference 2015 51
- 52. Interface Models • Multiple Inheritance • Very little code • Often Anemic • Indiscreet Sitecore User Group Conference 2015 52
- 53. Interface Models Sitecore User Group Conference 2015 53 Spoofing Logic
- 54. Template Models Sitecore User Group Conference 2015 54
- 55. Template Models • Code generation friendly • Easy to sync • Bloated • Indiscreet • Anemic Sitecore User Group Conference 2015 55
- 56. Rendering Models Sitecore User Group Conference 2015 56
- 57. Rendering Models • Use case specific • Minimum number of properties • Custom methods • Model explosion • Magic Properties Problem • Skinny Sitecore User Group Conference 2015 57
- 58. MVC Models Model–view–controller (MVC) is a software architectural pattern for implementing user interfaces. It divides a given software application into three interconnected parts, so as to separate internal representations of information from the ways that information is presented to or accepted from the user. - - Wiki Sitecore User Group Conference 2015 58
- 59. MVC Models What do we pass to the view? Sitecore User Group Conference 2015 59
- 60. MVC Models The View Model • Explicitly defines the contract • Easy to expand • Use convention • Separates Domain from View Sitecore User Group Conference 2015 60
- 61. MVC Models Sitecore User Group Conference 2015 61 Easy to find
- 62. MVC Models Sitecore User Group Conference 2015 62 Easy to identify!
- 63. And don’t forget MVP! MVP is a user interface architectural pattern engineered to facilitate automated unit testing and improve the separation of concerns in presentation logic. - Wiki Sitecore User Group Conference 2015 63
- 64. MVP Sitecore User Group Conference 2015 64
- 65. MVP is similar to MVC Sitecore User Group Conference 2015 65
- 66. MVP or MVC? Sitecore User Group Conference 2015 66
- 67. Finished!! Questions? Sitecore User Group Conference 2015 67
- 68. 68 Find Me: Sitecore User Group Conference 2015 68 Mike Edwards Sitecore MVP @mikeedwards83 @glasslu mike@glass.lu
- 69. [Reserved for sponsor logo’s] Sitecore User Group Conference 2015 69Sitecore User Group Conference 2015 69 Thank you