Class: ViewModel::ActiveRecord::UpdateData

Inherits:
Object
  • Object
show all
Defined in:
lib/view_model/active_record/update_data.rb

Defined Under Namespace

Modules: Schemas

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(viewmodel_class, metadata, hash_data, valid_reference_keys) ⇒ UpdateData

Returns a new instance of UpdateData.



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# File 'lib/view_model/active_record/update_data.rb', line 571

def initialize(viewmodel_class, metadata, hash_data, valid_reference_keys)
  self.viewmodel_class = viewmodel_class
  self.metadata        = metadata
  self.attributes      = {}
  self.associations    = {}
  self.referenced_associations = {}

  parse(hash_data, valid_reference_keys)
end

Instance Attribute Details

#associations ⇒ Object

Returns the value of attribute associations.



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# File 'lib/view_model/active_record/update_data.rb', line 396

def associations
  @associations
end

#attributes ⇒ Object

Returns the value of attribute attributes.



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# File 'lib/view_model/active_record/update_data.rb', line 396

def attributes
  @attributes
end

#metadata ⇒ Object

Returns the value of attribute metadata.



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# File 'lib/view_model/active_record/update_data.rb', line 396

def metadata
  @metadata
end

#referenced_associations ⇒ Object

Returns the value of attribute referenced_associations.



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# File 'lib/view_model/active_record/update_data.rb', line 396

def referenced_associations
  @referenced_associations
end

#viewmodel_class ⇒ Object

Returns the value of attribute viewmodel_class.



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# File 'lib/view_model/active_record/update_data.rb', line 396

def viewmodel_class
  @viewmodel_class
end

Class Method Details

.check_duplicate_updates(updates, type:) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 563

def self.check_duplicate_updates(updates, type:)
  # Ensure that no root is referred to more than once
  duplicates = updates.duplicates_by { |upd| upd.viewmodel_reference if upd.id }
  if duplicates.present?
    raise ViewModel::DeserializationError::DuplicateNodes.new(type, duplicates.keys)
  end
end

.empty_update_for(viewmodel) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 581

def self.empty_update_for(viewmodel)
  metadata = ViewModel::Metadata.new(viewmodel.id, viewmodel.view_name, viewmodel.class.schema_version, false)
  self.new(viewmodel.class, metadata, {}, [])
end

.parse_associated(association_data, blame_reference, valid_reference_keys, child_hash) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 645

def self.parse_associated(association_data, blame_reference, valid_reference_keys, child_hash)
  child_metadata = ViewModel.extract_viewmodel_metadata(child_hash)

  child_viewmodel_class =
    association_data.viewmodel_class_for_name(child_metadata.view_name)

  if child_viewmodel_class.nil?
    raise ViewModel::DeserializationError::InvalidAssociationType.new(
            association_data.association_name.to_s,
            child_metadata.view_name,
            blame_reference)
  end

  verify_schema_version!(child_viewmodel_class, child_metadata.schema_version, child_metadata.id) if child_metadata.schema_version

  UpdateData.new(child_viewmodel_class, child_metadata, child_hash, valid_reference_keys)
end

.parse_hashes(root_subtree_hashes, referenced_subtree_hashes = {}) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 529

def self.parse_hashes(root_subtree_hashes, referenced_subtree_hashes = {})
  valid_reference_keys = referenced_subtree_hashes.keys.to_set

  valid_reference_keys.each do |ref|
    unless ref.is_a?(String)
      raise ViewModel::DeserializationError::InvalidSyntax.new("Invalid reference string: #{ref}")
    end
  end

  # Construct root UpdateData
  root_updates = root_subtree_hashes.map do |subtree_hash|
    metadata = ViewModel.extract_viewmodel_metadata(subtree_hash)
    viewmodel_class = ViewModel::Registry.for_view_name(metadata.view_name)
    verify_schema_version!(viewmodel_class, metadata.schema_version, metadata.id) if metadata.schema_version
    UpdateData.new(viewmodel_class, metadata, subtree_hash, valid_reference_keys)
  end

  # Ensure that no root is referred to more than once
  check_duplicate_updates(root_updates, type: 'root')

  # Construct reference UpdateData
  referenced_updates = referenced_subtree_hashes.transform_values do |subtree_hash|
    metadata = ViewModel.extract_viewmodel_metadata(subtree_hash)
    viewmodel_class = ViewModel::Registry.for_view_name(metadata.view_name)
    verify_schema_version!(viewmodel_class, metadata.schema_version, metadata.id) if metadata.schema_version

    UpdateData.new(viewmodel_class, metadata, subtree_hash, valid_reference_keys)
  end

  check_duplicate_updates(referenced_updates.values, type: 'reference')

  return root_updates, referenced_updates
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 503

def [](name)
  case name
  when :id
    id
  when :_type
    viewmodel_class.view_name
  else
    attributes.fetch(name) { associations.fetch(name) { referenced_associations.fetch(name) } }
  end
end

#build_preload_specs(association_data, updates) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 601

def build_preload_specs(association_data, updates)
  if association_data.polymorphic?
    updates.map do |update_data|
      target_model = update_data.viewmodel_class.model_class
      DeepPreloader::PolymorphicSpec.new(
        target_model.name => update_data.preload_dependencies)
    end
  else
    updates.map { |update_data| update_data.preload_dependencies }
  end
end

#has_key?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/view_model/active_record/update_data.rb', line 514

def has_key?(name)
  case name
  when :id, :_type
    true
  else
    attributes.has_key?(name) || associations.has_key?(name) || referenced_associations.has_key?(name)
  end
end

#merge_preload_specs(association_data, specs) ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 613

def merge_preload_specs(association_data, specs)
  empty = association_data.polymorphic? ? DeepPreloader::PolymorphicSpec.new : DeepPreloader::Spec.new
  specs.inject(empty) { |acc, spec| acc.merge!(spec) }
end

#preload_dependencies ⇒ Object

Updates in terms of activerecord associations: used for preloading subtree associations necessary to perform update.



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# File 'lib/view_model/active_record/update_data.rb', line 620

def preload_dependencies
  deps = {}

  associations.merge(referenced_associations).each do |assoc_name, reference|
    association_data = self.viewmodel_class._association_data(assoc_name)

    preload_specs = build_preload_specs(association_data,
                                        to_sequence(assoc_name, reference))

    referenced_deps = merge_preload_specs(association_data, preload_specs)

    if association_data.through?
      referenced_deps = DeepPreloader::Spec.new(association_data.indirect_reflection.name.to_s => referenced_deps)
    end

    deps[association_data.direct_reflection.name.to_s] = referenced_deps
  end

  DeepPreloader::Spec.new(deps)
end

#reference_only? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/view_model/active_record/update_data.rb', line 525

def reference_only?
  attributes.empty? && associations.empty? && referenced_associations.empty?
end

#to_sequence(name, value) ⇒ Object

Produce a sequence of update datas for a given association update value, in the spirit of Array.wrap.



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# File 'lib/view_model/active_record/update_data.rb', line 587

def to_sequence(name, value)
  association_data = self.viewmodel_class._association_data(name)
  case
  when value.nil?
    []
  when association_data.referenced?
    []
  when association_data.collection? # nested, because of referenced? check above
    value.update_datas
  else
    [value]
  end
end

#viewmodel_reference ⇒ Object 



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# File 'lib/view_model/active_record/update_data.rb', line 641

def viewmodel_reference
  ViewModel::Reference.new(viewmodel_class, id)
end