Class: Operations::Components::Preconditions

Inherits:
Prechecks show all
Defined in:
lib/operations/components/preconditions.rb

Overview

We check all the precondition failures to return all the codes to the user at once. This provides a better UX, user is able to fix everything at once instead of getting messages one by one. This is similar to the idea of validations.

Precondition can return a Symbol - it will be used as an error code. If String is returned - it will be used as a message itself. Please avoid returning string, use i18n instead. Hash with :error key will be also treated as a failure ans used accordingly. Also, Failure monad gets unwrapped and the value follows the rules above. Also, it is possible to return an array of failures.

Successful preconditions returns either nil or an empty array or a Success monad.

Constant Summary

Constants inherited from Base

Base::DEFAULT_NAMES_MAP, Base::MONADS_DO_WRAPPER_SIGNATURES

Instance Method Summary collapse

Methods inherited from Prechecks

#callable?, #required_context

Instance Method Details

#call(params, context) ⇒ Object 



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# File 'lib/operations/components/preconditions.rb', line 20

def call(params, context)
  failures = callable.flat_map do |entry|
    results = Array.wrap(entry.call(**context))
    results.filter_map { |result| result_failure(result) }
  end

  result(
    params: params,
    context: context,
    errors: errors(normalize_failure(failures))
  )
end