class OutcomeValidator

Validates attribute by applying validation rule not to the attribute itself, but to another parameter, whose value depends on the attribute.

The resulting error is collected under the attribute's key, which is necessary to correctly bind the error to the field, that causes the problem.

@example

let(:user) { User.find_by(id: user_id) }
validates :user_id, outcome: { value: 'user.name', presence: true }
# user_id.user_name_presence

Public Instance Methods

validate_each(record, attribute, value) click to toggle source

rubocop: disable Metrics/MethodLength

# File lib/tram/validators/outcome_validator.rb, line 15
def validate_each(record, attribute, value)
  dependency = options[:value].to_s.gsub(".", "_")
  dependent  = Tram::Validators.chained_value(record, options[:value])
  validators = Tram::Validators.validators(@attributes, options, :value)

  sandbox = record.dup
  validators.each do |condition, validator|
    next if valid_in_sandbox(sandbox, attribute, dependent, validator)

    key = message_key(dependency, condition)
    record.errors.add attribute, key, model:       record,
                                      attribute:   attribute,
                                      value:       value,
                                      delependent: dependent
  end
end

Private Instance Methods

message_key(dependency, condition) click to toggle source
# File lib/tram/validators/outcome_validator.rb, line 41
def message_key(dependency, condition)
  [dependency, condition.to_s].compact.join("_").to_sym
end
valid_in_sandbox(sandbox, attribute, dependent, validator) click to toggle source

rubocop: enable Metrics/MethodLength

# File lib/tram/validators/outcome_validator.rb, line 35
def valid_in_sandbox(sandbox, attribute, dependent, validator)
  sandbox.errors.clear
  validator.validate_each(sandbox, attribute, dependent)
  sandbox.errors.empty?
end