Class: Datacaster::HashSchema

Inherits:
Base
  • Object
show all
Defined in:
lib/datacaster/hash_schema.rb

Instance Method Summary collapse

Methods included from Mixin

#&, #*, #call, #call_with_runtime, #cast_errors, #i18n_key, #i18n_map_keys, #i18n_scope, #i18n_vars, #then, #with_context, #with_object_context, #with_runtime, #|

Constructor Details

#initialize(fields, error_key = nil) ⇒ HashSchema

Returns a new instance of HashSchema.



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# File 'lib/datacaster/hash_schema.rb', line 3

def initialize(fields, error_key = nil)
  @fields = fields

  @error_keys = ['.hash_value', 'datacaster.errors.hash_value']
  @error_keys.unshift(error_key) if error_key
end

Instance Method Details

#cast(object, runtime:) ⇒ Object 



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# File 'lib/datacaster/hash_schema.rb', line 10

def cast(object, runtime:)
  return Datacaster.ErrorResult(I18nValues::Key.new(@error_keys, value: object)) unless object.is_a?(Hash)

  runtime.will_check!

  errors = {}
  result = {}

  @fields.each do |key, validator|
    value =
      if object.key?(key)
        object[key]
      else
        Datacaster.absent
      end

    new_value = runtime.checked_key!(key) { validator.with_runtime(runtime).(value) }
    if new_value.valid?
      result[key] = new_value.value
    else
      errors[key] = new_value.raw_errors
    end
  end

  if errors.empty?
    # All unchecked key-value pairs are passed through, and eliminated by ContextNode
    # at the end of the chain
    result_hash = object.merge(result)
    result_hash.keys.each { |k| result_hash.delete(k) if result_hash[k] == Datacaster.absent }
    Datacaster.ValidResult(result_hash)
  else
    Datacaster.ErrorResult(errors)
  end
end

#inspect ⇒ Object 



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# File 'lib/datacaster/hash_schema.rb', line 45

def inspect
  field_descriptions =
    @fields.map do |k, v|
      "#{k.inspect} => #{v.inspect}"
    end

  "#<Datacaster::HashSchema {#{field_descriptions.join(', ')}}>"
end