Exception: ActionController::ParameterMissing
| Relationships & Source Files | |
| Super Chains via Extension / Inclusion / Inheritance | |
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Class Chain:
self,
KeyError
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Instance Chain:
self,
DidYouMean::Correctable,
KeyError
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| Inherits: |
KeyError
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| Defined in: | actionpack/lib/action_controller/metal/strong_parameters.rb |
Overview
Raised when a required parameter is missing.
params = ActionController::Parameters.new(a: {})
params.fetch(:b)
# => ActionController::ParameterMissing: param is missing or the value is empty: b
params.require(:a)
# => ActionController::ParameterMissing: param is missing or the value is empty: a