Class: GraphQL::Client::QueryResult

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/client/query_result.rb

Overview

A QueryResult struct wraps data returned from a GraphQL response.

Wrapping the JSON-like Hash allows access with nice Ruby accessor methods rather than using ‘obj` access.

Wrappers also limit field visibility to fragment definitions.

Defined Under Namespace

Classes: ImplicitlyFetchedFieldError, NoFieldError, Scalar, UnfetchedFieldError, UnimplementedFieldError

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(*args) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 259

def method_missing(*args)
  super
rescue NoMethodError => e
  type = self.class.type
  raise e unless type

  unless type.fields[e.name.to_s]
    raise UnimplementedFieldError, "undefined field `#{e.name}' on #{type} type. https://git.io/v1y3m"
  end

  if data[e.name.to_s]
    error_class = ImplicitlyFetchedFieldError
    message = "implicitly fetched field `#{e.name}' on #{type} type. https://git.io/v1yGL"
  else
    error_class = UnfetchedFieldError
    message = "unfetched field `#{e.name}' on #{type} type. https://git.io/v1y3U"
  end

  node = self.class.source_node
  message += "\n\n" + node.to_query_string.sub(/\}$/, "+ #{e.name}\n}") if node
  raise error_class, message
end

Class Attribute Details

.fields ⇒ Object (readonly)

Returns the value of attribute fields.



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# File 'lib/graphql/client/query_result.rb', line 148

def fields
  @fields
end

.source_definition ⇒ Object (readonly)

Returns the value of attribute source_definition.



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# File 'lib/graphql/client/query_result.rb', line 144

def source_definition
  @source_definition
end

.source_node ⇒ Object (readonly)

Returns the value of attribute source_node.



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# File 'lib/graphql/client/query_result.rb', line 146

def source_node
  @source_node
end

.type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/graphql/client/query_result.rb', line 142

def type
  @type
end

Instance Attribute Details

#__typename ⇒ Object (readonly) Also known as: typename

Returns the value of attribute __typename.



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# File 'lib/graphql/client/query_result.rb', line 233

def __typename
  @__typename
end

#data ⇒ Object (readonly) Also known as: to_h

Returns the value of attribute data.



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# File 'lib/graphql/client/query_result.rb', line 230

def data
  @data
end

#errors ⇒ Object (readonly)

Public: Return errors associated with data.

Returns Errors collection.



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# File 'lib/graphql/client/query_result.rb', line 228

def errors
  @errors
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 154

def [](name)
  fields[name]
end

.cast(obj, errors = Errors.new) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 167

def self.cast(obj, errors = Errors.new)
  case obj
  when Hash
    new(obj, errors)
  when self
    obj
  when QueryResult
    spreads = Set.new(self.spreads(obj.class.source_node).map(&:name))

    unless spreads.include?(source_node.name)
      raise TypeError, "couldn't cast #{obj.inspect} to #{inspect}"
    end
    cast(obj.to_h, obj.errors)
  when Array
    List.new(obj.each_with_index.map { |e, idx| cast(e, errors.filter_by_path(idx)) }, errors)
  when NilClass
    nil
  else
    raise TypeError, obj.class.to_s
  end
end

.define(name:, source_definition:, source_node:, fields: {}) ⇒ Object

Internal



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# File 'lib/graphql/client/query_result.rb', line 70

def self.define(name:, source_definition:, source_node:, fields: {})
  type = source_definition.document_types[source_node]
  type = type.unwrap if type

  Class.new(self) do
    @name = name
    @type = type
    @source_node = source_node
    @source_definition = source_definition
    @fields = {}

    field_readers = Set.new

    fields.each do |field, klass|
      if @type.is_a?(GraphQL::ObjectType)
        field_node = @type.fields[field.to_s]
        if field_node && field_node.type.unwrap.is_a?(GraphQL::ScalarType)
          klass = Scalar.new(field_node.type.unwrap)
        end
      end

      @fields[field.to_sym] = klass

      send :attr_reader, field
      field_readers << field.to_sym

      # Convert GraphQL camelcase to snake case: commitComments -> commit_comments
      field_alias = ActiveSupport::Inflector.underscore(field)
      send :alias_method, field_alias, field if field != field_alias
      field_readers << field_alias.to_sym

      class_eval <<-RUBY, __FILE__, __LINE__
        def #{field_alias}?
          #{field_alias} ? true : false
        end
      RUBY
      field_readers << "#{field_alias}?".to_sym
    end

    assigns = @fields.map do |field, klass|
      if klass
        <<-RUBY
          @#{field} = self.class.fields[:#{field}].cast(@data["#{field}"], @errors.filter_by_path("#{field}"))
        RUBY
      else
        <<-RUBY
          @#{field} = @data["#{field}"]
        RUBY
      end
    end

    if @type && @type.is_a?(GraphQL::ObjectType)
      assigns.unshift "@__typename = self.class.type.name"
    end

    class_eval <<-RUBY, __FILE__, __LINE__
      def initialize(data, errors = Errors.new)
        @data = data
        @errors = errors

        #{assigns.join("\n")}
        freeze
      end
    RUBY

    if @source_definition.enforce_collocated_callers
      Client.enforce_collocated_callers(self, field_readers, source_definition.source_location[0])
    end
  end
end

.inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 163

def self.inspect
  "#<#{name} fields=#{@fields.keys.inspect}>"
end

.name ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 159

def self.name
  @name || super || GraphQL::Client::QueryResult.name
end

.new(obj, *args) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 203

def self.new(obj, *args)
  case obj
  when Hash
    super
  else
    cast(obj, *args)
  end
end

.schema ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 150

def schema
  source_definition.schema
end

.spreads(node) ⇒ Object

Internal



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# File 'lib/graphql/client/query_result.rb', line 190

def self.spreads(node)
  node.selections.flat_map do |selection|
    case selection
    when Language::Nodes::FragmentSpread
      selection
    when Language::Nodes::InlineFragment
      spreads(selection)
    else
      []
    end
  end
end

.wrap(source_definition, node, name: nil) ⇒ Object

Internal: Get QueryResult class for result of query.

Returns subclass of QueryResult or nil.



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# File 'lib/graphql/client/query_result.rb', line 25

def self.wrap(source_definition, node, name: nil)
  fields = {}

  node.selections.each do |selection|
    case selection
    when Language::Nodes::FragmentSpread
      nil
    when Language::Nodes::Field
      field_name = selection.alias || selection.name
      field_klass = nil
      if selection.selections.any?
        field_klass = wrap(source_definition, selection, name: "#{name}[:#{field_name}]")
      end
      fields[field_name] ? fields[field_name] |= field_klass : fields[field_name] = field_klass
    when Language::Nodes::InlineFragment
      wrap(source_definition, selection, name: name).fields.each do |fragment_name, klass|
        fields[fragment_name.to_s] ? fields[fragment_name.to_s] |= klass : fields[fragment_name.to_s] = klass
      end
    end
  end

  define(name: name, source_definition: source_definition, source_node: node, fields: fields)
end

.|(other) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 212

def self.|(other)
  new_fields = fields.dup
  other.fields.each do |name, value|
    if new_fields[name]
      new_fields[name] |= value
    else
      new_fields[name] = value
    end
  end
  # TODO: Picking first source node seems error prone
  define(name: self.name, source_definition: source_definition, source_node: source_node, fields: new_fields)
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 244

def inspect
  ivars = self.class.fields.keys.map do |sym|
    value = instance_variable_get("@#{sym}")
    if value.is_a?(QueryResult)
      "#{sym}=#<#{value.class.name}>"
    else
      "#{sym}=#{value.inspect}"
    end
  end
  buf = "#<#{self.class.name}".dup
  buf << " " << ivars.join(" ") if ivars.any?
  buf << ">"
  buf
end

#respond_to_missing?(*args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/client/query_result.rb', line 282

def respond_to_missing?(*args)
  super
end

#type_of?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/client/query_result.rb', line 236

def type_of?(type)
  if type = self.class.schema.types.fetch(type.to_s, nil)
    self.class.schema.possible_types(type).any? { |t| __typename == t.name }
  else
    false
  end
end