feature(hooks): add decorators for declaring hooks

[natesilva]

I had to re-do the pull request after I botched the original branch. The only change is that this centralizes the hook implementation logic into the hooks services file.

Fixes #88, replaces #97.

[codecov-io]

Codecov Report

Merging #101 into master will increase coverage by 0.64%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #101      +/-   ##
=========================================
+ Coverage   95.66%   96.3%   +0.64%     
=========================================
  Files          66      99      +33     
  Lines         761     893     +132     
  Branches      107     114       +7     
=========================================
+ Hits          728     860     +132     
  Misses         11      11              
  Partials       22      22

Impacted Files	Coverage Δ
lib/annotations/hooks/AfterCreate.ts	100% <100%> (ø)
...notations/hooks/BeforeFindAfterExpandIncludeAll.ts	100% <100%> (ø)
lib/annotations/hooks/BeforeDestroy.ts	100% <100%> (ø)
lib/annotations/hooks/AfterRestore.ts	100% <100%> (ø)
lib/annotations/hooks/AfterBulkUpdate.ts	100% <100%> (ø)
lib/annotations/hooks/AfterDestroy.ts	100% <100%> (ø)
lib/annotations/hooks/BeforeBulkDelete.ts	100% <100%> (ø)
lib/annotations/hooks/AfterBulkRestore.ts	100% <100%> (ø)
lib/annotations/hooks/AfterBulkDelete.ts	100% <100%> (ø)
lib/annotations/hooks/BeforeCount.ts	100% <100%> (ø)
... and 57 more

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[natesilva]

Thank you!

[RobinBuschmann]

Thank you for implementing this. It's a great feature!

[RobinBuschmann]

I've made a beta release, in which this feature is included now :)

npm install [email protected]

[thormengkheang]

@RobinBuschmann can I use an async function like this?

  @BeforeUpdate
  @BeforeCreate
  static async hashPassword(instance: User) {
    // this will be called when an instance is created or updated
    instance.password = await bcrypt.hash(instance.password, 10);
  }

[natesilva]

@mengkheang Yes. A hook function may return a Promise, so async functions are fine. http://docs.sequelizejs.com/manual/tutorial/hooks.html#declaring-hooks

[thormengkheang]

@natesilva thank for the explaining :)

[RobinBuschmann]

[email protected] is released now 🎉

[natesilva]

Thank you!