Class: Dis::Validations::DataPresence

Inherits:

ActiveModel::Validator

• Object
• ActiveModel::Validator
• Dis::Validations::DataPresence

Defined in:

lib/dis/validations/data_presence.rb

Overview

Dis Data Presence Validation

Validates that data has been assigned to a Model record. Empty strings are treated as missing data.

See Also:

• Model::ClassMethods#validates_data_presence

Class Method Summary

• .empty_hash ⇒ Object

Instance Method Summary

• #validate(record) ⇒ void

  Validates that a record has data, either freshly assigned or persisted in the storage.

Class Method Details

.empty_hash ⇒ Object

# File 'lib/dis/validations/data_presence.rb', line 25

def empty_hash
  @empty_hash ||= Dis::Storage.file_digest("")
end

Instance Method Details

#validate(record) ⇒ void

This method returns an undefined value.

Validates that a record has data, either freshly assigned or persisted in the storage. Adds a :blank error on :data if not.

Parameters:

• record (ActiveRecord::Base)

# File 'lib/dis/validations/data_presence.rb', line 18

def validate(record)
  return if record.data? && record.content_hash != self.class.empty_hash

  record.errors.add(:data, :blank)
end