rails popular error of top 10

Topic about top 10 error

tell us popular error and
way to prevent them

1.ActionController::RoutingError

this error get 404error

this means your app doesn't have URL.

2. NoMethodError: undefined method '[]' for nil:NilClass

• avoid user&

street = user&.address&.street

3.ActionController::InvalidAuthenticityToken

CSRF (Cross Site Request Forgery)

word

• gotchas　落とし穴

• relevant

  • ex） errors are not relevant to most readers.

• dig in

  • see detail

• classic

  • very typical of its kind.

• errant 間違った

  • errant users

• keep in mind

ex）
You should also keep in mind that

• notation 表記方法

• retrieve

• internal error　内部エラー

• vulnerability 脆弱性

• malicious　悪意のある

• mitigate 半減させる

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