Class: ActiveModel::Validations::DimensionValidator

Inherits:
EachValidator
  • Object
show all
Defined in:
lib/dimension_validation/dimension_validator.rb

Constant Summary collapse

DIMENSIONS = 
[:width, :height, :aspect_ratio].freeze
CHECKS = 
{ greater_than: :>, greater_than_or_equal_to: :>=,
equal_to: :==, less_than: :<, less_than_or_equal_to: :<= }.freeze

Instance Method Summary collapse

Instance Method Details

#check_validity! ⇒ Object 



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# File 'lib/dimension_validation/dimension_validator.rb', line 9

def check_validity!
  options.slice(*DIMENSIONS).each do |dimension, dimension_options|
    if dimension_options.empty?
      raise ArgumentError, "You must at least pass in one of these options for #{dimension} - #{CHECKS.keys.join(', ')}"
    end

    dimension_options.slice(*CHECKS.keys).each do |option, value|
      unless value.is_a?(Numeric) || value.is_a?(Proc) || value.is_a?(Symbol)
        raise ArgumentError, ":#{option} of #{dimension} must be a number, a symbol or a proc"
      end
    end
  end
end

#validate_each(record, attr_name, value) ⇒ Object 



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# File 'lib/dimension_validation/dimension_validator.rb', line 23

def validate_each(record, attr_name, value)
  unless with_width_and_height?(value)
    record.errors.add(attr_name, 'dimension.without_width_or_height'.to_sym, filtered_options(value))
    return
  end

  result = {}
  [:width, :height].each do |dimension|
    length = value.send(dimension)
    unless is_number?(length)
      dimension_text = I18n.t(dimension, scope: 'errors.messages.dimension')
      record.errors.add(attr_name, 'dimension.not_a_number'.to_sym, filtered_options(value).merge!(dimension: dimension_text))
      return
    end

    result[dimension] = length
  end
  result[:aspect_ratio] = (result[:width] / result[:height].to_f)

  options.slice(*DIMENSIONS).each do |dimension, dimension_options|
    computed_value = result[dimension]
    dimension_text = I18n.t(dimension, scope: 'errors.messages.dimension')

    dimension_options.slice(*CHECKS.keys).each do |option, option_value|
      case option_value
      when Proc
        option_value = option_value.call(record)
      when Symbol
        option_value = record.send(option_value)
      end

      unless computed_value.send(CHECKS[option], option_value)
        record.errors.add(attr_name, "dimension.#{option}".to_sym, filtered_options(value).merge!(dimension: dimension_text, count: option_value))
      end
    end
  end
end