Class: Attributor::Hash

Inherits:
Object
  • Object
show all
Includes:
Container, Dumpable, Enumerable
Defined in:
lib/attributor/types/hash.rb

Direct Known Subclasses

Model

Constant Summary collapse

MAX_EXAMPLE_DEPTH = 
10
CIRCULAR_REFERENCE_MARKER = 
'...'.freeze

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Container

included

Constructor Details

#initialize(contents = {}) ⇒ Hash

Returns a new instance of Hash.



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# File 'lib/attributor/types/hash.rb', line 582

def initialize(contents = {})
  @validating = false
  @dumping = false

  @contents = contents
end

Class Attribute Details

.extra_keys ⇒ Object

Returns the value of attribute extra_keys.



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# File 'lib/attributor/types/hash.rb', line 31

def extra_keys
  @extra_keys
end

.insensitive_map ⇒ Object (readonly)

Returns the value of attribute insensitive_map.



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# File 'lib/attributor/types/hash.rb', line 30

def insensitive_map
  @insensitive_map
end

.key_attribute ⇒ Object (readonly)

Returns the value of attribute key_attribute.



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# File 'lib/attributor/types/hash.rb', line 29

def key_attribute
  @key_attribute
end

.key_type ⇒ Object

Returns the value of attribute key_type.



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# File 'lib/attributor/types/hash.rb', line 27

def key_type
  @key_type
end

.options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/attributor/types/hash.rb', line 27

def options
  @options
end

.requirements ⇒ Object (readonly)

Returns the value of attribute requirements.



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# File 'lib/attributor/types/hash.rb', line 32

def requirements
  @requirements
end

.value_attribute ⇒ Object (readonly)

Returns the value of attribute value_attribute.



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# File 'lib/attributor/types/hash.rb', line 28

def value_attribute
  @value_attribute
end

.value_type ⇒ Object

Returns the value of attribute value_type.



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# File 'lib/attributor/types/hash.rb', line 27

def value_type
  @value_type
end

Instance Attribute Details

#contents ⇒ Object (readonly)

TODO: Think about the format of the subcontexts to use: let’s use .at(key.to_s)



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# File 'lib/attributor/types/hash.rb', line 524

def contents
  @contents
end

#dumping ⇒ Object (readonly)

Returns the value of attribute dumping.



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# File 'lib/attributor/types/hash.rb', line 580

def dumping
  @dumping
end

#validating ⇒ Object (readonly)

Returns the value of attribute validating.



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# File 'lib/attributor/types/hash.rb', line 580

def validating
  @validating
end

Class Method Details

.add_requirement(req) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 152

def self.add_requirement(req)
  @requirements << req
  return unless req.attr_names
  non_existing = req.attr_names - attributes.keys
  unless non_existing.empty?
    raise "Invalid attribute name(s) found (#{non_existing.join(', ')}) when defining a requirement of type #{req.type} for #{Attributor.type_name(self)} ." \
          "The only existing attributes are #{attributes.keys}"
  end
end

.as_json_schema(shallow: false, example: nil, attribute_options: {}) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 469

def self.as_json_schema( shallow: false, example: nil, attribute_options: {} )
  hash = super
  opts = self.options.merge( attribute_options )

  if key_type
    hash[:'x-key_type'] = key_type.as_json_schema
  end

  if self.keys.any?
    # Spit keys if it's the root or if it's an anonymous structures
    if ( !shallow || self.name == nil)
      required_names_from_attr = []
      # FIXME: change to :keys when the praxis doc browser supports displaying those
      hash[:properties] = self.keys.each_with_object({}) do |(sub_name, sub_attribute), sub_attributes|
        required_names_from_attr << sub_name if sub_attribute.options[:required] == true
        sub_example = example.get(sub_name) if example
        sub_attributes[sub_name] = sub_attribute.as_json_schema(shallow: true, example: sub_example)
      end

      # Expose the more complex requirements to in the x-tended attribute
      extended_requirements = self.requirements.each_with_object([]) do |req, list|
        described_req = req.describe(shallow)
        if described_req[:type] == :all
          # Add the names of the attributes that have the required flag too
          described_req[:attributes] |= required_names_from_attr
          required_names_from_attr = []
        end
        list << described_req
      end
      all = extended_requirements.find{|r| r[:type] == :all }
      if ( all && !all[:attributes].empty? )
        hash[:required] = all[:attributes]
      end
      hash[:'x-requirements'] = extended_requirements unless extended_requirements.empty?
    end
  else
    hash[:'x-value_type'] = value_type.as_json_schema(shallow:true)
  end

  if opts[:allow_extra]
    hash[:additionalProperties] = if value_type == Attributor::Object
      true
    else
      value_type.as_json_schema(shallow: true)
    end
  end
  # TODO: minProperties and maxProperties and patternProperties
  hash
end

.attributes(**options, &key_spec) ⇒ Object

Raises:

  • (@error) 


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# File 'lib/attributor/types/hash.rb', line 82

def self.attributes(**options, &key_spec)
  raise @error if @error

  keys(**options, &key_spec)
end

.check_option!(name, _definition) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 246

def self.check_option!(name, _definition)
  case name
  when :reference
    :ok # FIXME: ... actually do something smart
  when :dsl_compiler
    :ok
  when :case_insensitive_load
    unless key_type <= String
      raise Attributor::AttributorException, ":case_insensitive_load may not be used with keys of type #{key_type.name}"
    end
    :ok
  when :allow_extra
    :ok
  else
    :unknown
  end
end

.construct(constructor_block, **options) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 162

def self.construct(constructor_block, **options)
  return self if constructor_block.nil?

  unless @concrete
    return of(key: key_type, value: value_type)
           .construct(constructor_block, **options)
  end

  if options[:case_insensitive_load] && !(key_type <= String)
    raise Attributor::AttributorException, ":case_insensitive_load may not be used with keys of type #{key_type.name}"
  end

  keys(**options, &constructor_block)
  self
end

.constructable? ⇒ Boolean

Returns:



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# File 'lib/attributor/types/hash.rb', line 148

def self.constructable?
  true
end

.definition ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 107

def self.definition
  opts = {
    key_type: @key_type,
    value_type: @value_type
  }.merge(@options)

  blocks = @saved_blocks.shift(@saved_blocks.size)
  compiler = dsl_class.new(self, **opts)
  compiler.parse(*blocks)

  if opts[:case_insensitive_load] == true
    @insensitive_map = keys.keys.each_with_object({}) do |k, map|
      map[k.downcase] = k
    end
  end
rescue => e
  @error = InvalidDefinition.new(self, e)
  raise
end

.describe(shallow = false, example: nil) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 432

def self.describe(shallow = false, example: nil)
  hash = super(shallow)

  hash[:key] = { type: key_type.describe(true) } if key_type

  if keys.any?
    # Spit keys if it's the root or if it's an anonymous structures
    if ( !shallow || self.name == nil)
      required_names_from_attr = []
      # FIXME: change to :keys when the praxis doc browser supports displaying those
      hash[:attributes] = self.keys.each_with_object({}) do |(sub_name, sub_attribute), sub_attributes|
        required_names_from_attr << sub_name if sub_attribute.options[:required] == true
        sub_example = example.get(sub_name) if example
        sub_attributes[sub_name] = sub_attribute.describe(true, example: sub_example)
      end
      hash[:requirements] = requirements.each_with_object([]) do |req, list|
        described_req = req.describe(shallow)
        if described_req[:type] == :all
          # Add the names of the attributes that have the required flag too
          described_req[:attributes] |= required_names_from_attr
          required_names_from_attr = []
        end
        list << described_req
      end
      # Make sure we create an :all requirement, if there wasn't one so we can add the required: true attributes
      unless required_names_from_attr.empty?
        hash[:requirements] << {type: :all, attributes: required_names_from_attr }
      end
    end
  else
    hash[:value] = { type: value_type.describe(true) }
    hash[:example] = example if example
  end

  hash
end

.dsl_class ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 127

def self.dsl_class
  @options[:dsl_compiler] || HashDSLCompiler
end

.dump(value, **opts) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 240

def self.dump(value, **opts)
  if (loaded = load(value))
    loaded.dump(**opts)
  end
end

.example(context = nil, **values) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 214

def self.example(context = nil, **values)
  return new if key_type == Object && value_type == Object && keys.empty?

  context ||= ["#{Hash}-#{rand(10_000_000)}"]
  context = Array(context)

  if keys.any?
    result = new
    result.extend(ExampleMixin)

    result.lazy_attributes = example_contents(context, result, **values)
  else
    hash = ::Hash.new

    (rand(3) + 1).times do |i|
      example_key = key_type.example(context + ["at(#{i})"])
      subcontext = context + ["at(#{example_key})"]
      hash[example_key] = value_type.example(subcontext)
    end

    result = new(hash)
  end

  result
end

.example_contents(context, parent, **values) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 180

def self.example_contents(context, parent, **values)
  hash = ::Hash.new
  example_depth = context.size
  # Be smart about what attributes to use for the example: i.e. have into account complex requirements
  # that might have been defined in the hash like at_most(1).of ..., exactly(2).of ...etc.
  # But play it safe and default to the previous behavior in case there is any error processing them
  # ( that is until the SmartAttributeSelector class isn't fully tested and ready for prime time)
  begin
    stack = SmartAttributeSelector.new( requirements.map(&:describe), keys.keys , values)
    selected = stack.process
  rescue => e
    selected = keys.keys
  end

  keys.select{|n,attr| selected.include? n}.each do |sub_attribute_name, sub_attribute|
    if sub_attribute.attributes
      # TODO: add option to raise an exception in this case?
      next if example_depth > MAX_EXAMPLE_DEPTH
    end

    sub_context = generate_subcontext(context, sub_attribute_name)
    block = proc do
      value = values.fetch(sub_attribute_name) do
        sub_attribute.example(sub_context, parent: parent)
      end
      sub_attribute.load(value, sub_context)
    end

    hash[sub_attribute_name] = block
  end

  hash
end

.family ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 56

def self.family
  'hash'
end

.from_hash(object, context, recurse: false) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 392

def self.from_hash(object, context, recurse: false)
  hash = new

  # if the hash definition includes named extra keys, initialize
  # its value from the object in case it provides some already.
  # this is to ensure it exists when we handle any extra keys
  # that may exist in the object later
  if extra_keys
    sub_context = generate_subcontext(context, extra_keys)
    v = object.fetch(extra_keys, {})
    hash.set(extra_keys, v, context: sub_context, recurse: recurse)
  end

  object.each do |k, val|
    next if k == extra_keys

    sub_context = generate_subcontext(context, k)
    hash.set(k, val, context: sub_context, recurse: recurse)
  end

  # handle default values for missing keys
  keys.each do |key_name, attribute|
    next if hash.key?(key_name)
    sub_context = generate_subcontext(context, key_name)
    default = attribute.load(nil, sub_context, recurse: recurse)
    hash[key_name] = default unless default.nil?
  end

  hash
end

.generate_subcontext(context, key_name) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 302

def self.generate_subcontext(context, key_name)
  context + ["key(#{key_name.inspect})"]
end

.inherited(klass) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 64

def self.inherited(klass)
  k = key_type
  v = value_type

  klass.instance_eval do
    @saved_blocks = []
    @options = { allow_extra: false }
    @keys = {}
    @key_type = k
    @value_type = v
    @key_attribute = Attribute.new(@key_type)
    @value_attribute = Attribute.new(@value_type)
    @requirements = []

    @error = false
  end
end

.json_schema_type ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 519

def self.json_schema_type
  :object
end

.keys(**options, &key_spec) ⇒ Object

Raises:

  • (@error) 


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# File 'lib/attributor/types/hash.rb', line 88

def self.keys(**options, &key_spec)
  raise @error if @error

  if block_given?
    @saved_blocks << key_spec
    @options.merge!(options)
  elsif @saved_blocks.any?
    definition
  end
  @keys
end

.load(value, context = Attributor::DEFAULT_ROOT_CONTEXT, recurse: false, **_options) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 264

def self.load(value, context = Attributor::DEFAULT_ROOT_CONTEXT, recurse: false, **_options)

  return value if value.is_a?(self)
  return nil if value.nil? && !recurse

  context = Array(context)
  loaded_value = self.parse(value, context)

  return from_hash(loaded_value, context, recurse: recurse) if keys.any?
  load_generic(loaded_value, context)
end

.load_generic(value, context) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 294

def self.load_generic(value, context)
  return new(value) if key_type == Object && value_type == Object

  value.each_with_object(new) do |(k, v), obj|
    obj[key_type.load(k, context)] = value_type.load(v, context)
  end
end

.native_type ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 131

def self.native_type
  self
end

.of(key: @key_type, value: @value_type) ⇒ Object

Examples:

Hash.of(key: String, value: Integer)





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# File 'lib/attributor/types/hash.rb', line 140

def self.of(key: @key_type, value: @value_type)
  ::Class.new(self) do
    self.key_type = key
    self.value_type = value
    @keys = {}
  end
end

.parse(value, context) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 276

def self.parse(value, context)
  if value.nil?
    {}
  elsif value.is_a?(Attributor::Hash)
    value.contents
  elsif value.is_a?(::Hash)
    value
  elsif value.is_a?(::String)
    decode_json(value, context)
  elsif value.respond_to?(:to_h)
    value.to_h
  elsif value.respond_to?(:to_hash) # Deprecate this in lieu of to_h only?
    value.to_hash
  else
    raise Attributor::IncompatibleTypeError.new(context: context, value_type: value.class, type: self)
  end
end

.valid_type?(type) ⇒ Boolean

Returns:



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# File 'lib/attributor/types/hash.rb', line 135

def self.valid_type?(type)
  type.is_a?(self) || type.is_a?(::Hash)
end

.validate(object, context = Attributor::DEFAULT_ROOT_CONTEXT, _attribute) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 423

def self.validate(object, context = Attributor::DEFAULT_ROOT_CONTEXT, _attribute)
  context = [context] if context.is_a? ::String

  unless object.is_a?(self)
    raise ArgumentError, "#{name} can not validate object of type #{object.class.name} for #{Attributor.humanize_context(context)}."
  end
  object.validate(context)
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 605

def ==(other)
  contents == other || (other.respond_to?(:contents) ? contents == other.contents : false)
end

#[](k) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 526

def [](k)
  @contents[k]
end

#[]=(k, v) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 534

def []=(k, v)
  @contents[k] = v
end

#_get_attr(k) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 530

def _get_attr(k)
  self[k]
end

#delete(key) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 576

def delete(key)
  @contents.delete(key)
end

#dump(**opts) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 677

def dump(**opts)
  return CIRCULAR_REFERENCE_MARKER if @dumping
  @dumping = true

  contents.each_with_object({}) do |(k, v), hash|
    k = key_attribute.dump(k, **opts)

    v = if (attribute_for_value = self.class.keys[k])
          attribute_for_value.dump(v, **opts)
        else
          value_attribute.dump(v, **opts)
        end

    hash[k] = v
  end
ensure
  @dumping = false
end

#each(&block) ⇒ Object Also known as: each_pair 



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# File 'lib/attributor/types/hash.rb', line 538

def each(&block)
  @contents.each(&block)
end

#empty? ⇒ Boolean

Returns:



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# File 'lib/attributor/types/hash.rb', line 556

def empty?
  @contents.empty?
end

#generate_subcontext(context, key_name) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 310

def generate_subcontext(context, key_name)
  self.class.generate_subcontext(context, key_name)
end

#get(key, context: generate_subcontext(Attributor::DEFAULT_ROOT_CONTEXT, key)) ⇒ Object

Raises:



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# File 'lib/attributor/types/hash.rb', line 314

def get(key, context: generate_subcontext(Attributor::DEFAULT_ROOT_CONTEXT, key))
  key = self.class.key_attribute.load(key, context)

  return self.get_generic(key, context) if self.class.keys.empty?
  value = @contents[key]

  # FIXME: getting an unset value here should not force it in the hash
  if (attribute = self.class.keys[key])
    loaded_value = attribute.load(value, context)
    return nil if loaded_value.nil?
    return self[key] = loaded_value
  end

  if self.class.options[:case_insensitive_load]
    key = self.class.insensitive_map[key.downcase]
    return get(key, context: context)
  end

  if self.class.options[:allow_extra]
    return @contents[key] = self.class.value_attribute.load(value, context) if self.class.extra_keys.nil?
    extra_keys_key = self.class.extra_keys

    if @contents.key? extra_keys_key
      return @contents[extra_keys_key].get(key, context: context)
    end

  end

  raise LoadError, "Unknown key received: #{key.inspect} for #{Attributor.humanize_context(context)}"
end

#get_generic(key, context) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 345

def get_generic(key, context)
  if @contents.key? key
    value = @contents[key]
    loaded_value = value_attribute.load(value, context)
    return self[key] = loaded_value
  elsif self.class.options[:case_insensitive_load]
    key = key.downcase
    @contents.each do |k, _v|
      return get(key, context: context) if key == k.downcase
    end
  end
  nil
end

#key?(k) ⇒ Boolean Also known as: has_key?

Returns:



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# File 'lib/attributor/types/hash.rb', line 560

def key?(k)
  @contents.key?(k)
end

#key_attribute ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 597

def key_attribute
  self.class.key_attribute
end

#key_type ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 589

def key_type
  self.class.key_type
end

#keys ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 548

def keys
  @contents.keys
end

#merge(h) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 565

def merge(h)
  case h
  when self.class
    self.class.new(contents.merge(h.contents))
  when Attributor::Hash
    raise ArgumentError, 'cannot merge Attributor::Hash instances of different types' unless h.is_a?(self.class)
  else
    raise TypeError, "no implicit conversion of #{h.class} into Attributor::Hash"
  end
end

#set(key, value, context: generate_subcontext(Attributor::DEFAULT_ROOT_CONTEXT, key), recurse: false) ⇒ Object

Raises:



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# File 'lib/attributor/types/hash.rb', line 359

def set(key, value, context: generate_subcontext(Attributor::DEFAULT_ROOT_CONTEXT, key), recurse: false)
  key = self.class.key_attribute.load(key, context)

  if self.class.keys.empty?
    return self[key] = self.class.value_attribute.load(value, context)
  end

  if (attribute = self.class.keys[key])
    return self[key] = attribute.load(value, context, recurse: recurse)
  end

  if self.class.options[:case_insensitive_load]
    key = self.class.insensitive_map[key.downcase]
    return set(key, value, context: context)
  end

  if self.class.options[:allow_extra]
    return self[key] = self.class.value_attribute.load(value, context) if self.class.extra_keys.nil?

    extra_keys_key = self.class.extra_keys

    unless @contents.key? extra_keys_key
      extra_keys_value = self.class.keys[extra_keys_key].load({})
      @contents[extra_keys_key] = extra_keys_value
    end

    return self[extra_keys_key].set(key, value, context: context)

  end

  raise LoadError, "Unknown key received: #{key.inspect} while loading #{Attributor.humanize_context(context)}"
end

#size ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 544

def size
  @contents.size
end

#to_h ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 306

def to_h
  Attributor.recursive_to_h(@contents)
end

#validate(context = Attributor::DEFAULT_ROOT_CONTEXT) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 609

def validate(context = Attributor::DEFAULT_ROOT_CONTEXT)
  @validating = true
  context = [context] if context.is_a? ::String

  if self.class.keys.any?
    extra_keys = @contents.keys - self.class.keys.keys
    if extra_keys.any? && !self.class.options[:allow_extra]
      return extra_keys.collect do |k|
        "#{Attributor.humanize_context(context)} can not have key: #{k.inspect}"
      end
    end
    self.validate_keys(context)
  else
    self.validate_generic(context)
  end
ensure
  @validating = false      
end

#validate_generic(context) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 662

def validate_generic(context)
  @contents.each_with_object([]) do |(key, value), errors|
    # FIXME: the sub contexts and error messages don't really make sense here
    unless key_type == Attributor::Object
      sub_context = context + ["key(#{key.inspect})"]
      errors.concat key_attribute.validate(key, sub_context)
    end

    unless value_type == Attributor::Object
      sub_context = context + ["value(#{value.inspect})"]
    errors.concat value_attribute.validate(value, sub_context)
    end
  end
end

#validate_keys(context) ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 628

def validate_keys(context)
  errors = []
  keys_provided = []

  self.class.keys.each do |key, attribute|
    sub_context = self.class.generate_subcontext(context, key)

    value = _get_attr(key)
    keys_provided << key if @contents.key?(key)

    if value.respond_to?(:validating) # really, it's a thing with sub-attributes
      next if value.validating
    end
    # Isn't this handled by the requirements validation? NO! we might want to combine
    if attribute.options[:required] && !@contents.key?(key)
      errors.concat ["Attribute #{Attributor.humanize_context(sub_context)} is required."]
    end
    if @contents[key].nil?
      if !Attribute.nullable_attribute?(attribute.options) && @contents.key?(key)
        errors.concat ["Attribute #{Attributor.humanize_context(sub_context)} is not nullable."]
      end
      # No need to validate the attribute further if the key wasn't passed...(or we would get nullable errors etc..cause the attribute has no
      # context if its containing key was even passed (and there might not be a containing key for a top level attribute anyways))
    else
      errors.concat attribute.validate(value, sub_context)
    end
  end
  self.class.requirements.each do |requirement|
    validation_errors = requirement.validate(keys_provided, context)
    errors.concat(validation_errors) unless validation_errors.empty?
  end
  errors
end

#value_attribute ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 601

def value_attribute
  self.class.value_attribute
end

#value_type ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 593

def value_type
  self.class.value_type
end

#values ⇒ Object 



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# File 'lib/attributor/types/hash.rb', line 552

def values
  @contents.values
end