Class: ParametersValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
app/validators/parameters_validator.rb

Overview

Validates that attribute's value is Array which is the only valid type signature for serialized parameters.

Constant Summary collapse

TYPE_SIGNATURE_SENTENCE =

Sentence explaining the valid type signature for parameters.

'Valid parameters are an Array<Array(String, String)>.'

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ void

This method returns an undefined value.

Validates that attribute's value on record is Array<Array(String, String)> which is the only valid type signature for serialized parameters.



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# File 'app/validators/parameters_validator.rb', line 19

def validate_each(record, attribute, value)
  if value.is_a? Array
    value.each_with_index do |element, index|
      if element.is_a? Array
        if element.length != 2
          extreme = :few

          if element.length > 2
            extreme = :many
          end

          length_error = length_error_at(
              :extreme => extreme,
              :element => element,
              :index => index
          )

          record.errors.add attribute, length_error
        else
          parameter_name = element.first

          if parameter_name.is_a? String
            unless parameter_name.present?
              error = error_at(
                  :element => element,
                  :index => index,
                  :prefix => "has blank parameter name"
              )
              record.errors.add attribute, error
            end
          else
            error = error_at(
                :element => element,
                :index => index,
                :prefix => "has non-String parameter name (#{parameter_name.inspect})"
            )
            record.errors.add attribute, error
          end

          parameter_value = element.second

          unless parameter_value.is_a? String
            error = error_at(
                :element => element,
                :index => index,
                :prefix => "has non-String parameter value (#{parameter_value.inspect})"
            )
            record.errors.add attribute, error
          end
        end
      else
        error = error_at(
            :element => element,
            :index => index,
            :prefix => 'has non-Array'
        )
        record.errors.add attribute, error
      end
    end
  else
    record.errors.add attribute, "is not an Array.  #{TYPE_SIGNATURE_SENTENCE}"
  end
end