Exception: Funes::InvalidMaterializationState

Inherits:
StandardError
  • Object
show all
Defined in:
lib/funes/invalid_materialization_state.rb

Overview

Raised when a projection configured with persist_materialization_model_with produces an invalid materialization state.

When a projection declares a custom persistence method via persist_materialization_model_with, Funes still validates the materialization (via state.valid?) before delegating the write. If validation fails, this exception is raised and the custom persist method is not invoked.

The failed materialization is exposed via #record, mirroring the ergonomics of ActiveRecord::RecordInvalid — but without coupling the custom-persist path to ActiveRecord. Like any unrescued exception, it propagates out of materialize! and rolls back any enclosing ActiveRecord::Base.transaction, which is the desired behaviour for transactional projections.

Examples:

Handling an invalid materialization state

begin
  YourProjection.materialize!(events, "some-id", at: Time.current)
rescue Funes::InvalidMaterializationState => e
  Rails.logger.error "Invalid materialization: #{e.message}"
  e.record.errors.full_messages # the validation errors on the materialization
end

See Also:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(record) ⇒ InvalidMaterializationState

Returns a new instance of InvalidMaterializationState.



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# File 'lib/funes/invalid_materialization_state.rb', line 26

def initialize(record)
  @record = record
  super("Invalid materialization state: #{record.errors.full_messages.to_sentence}")
end

Instance Attribute Details

#record ⇒ Object (readonly)

Returns the value of attribute record.



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# File 'lib/funes/invalid_materialization_state.rb', line 24

def record
  @record
end