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.

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 195

def method_missing(*args)
  super
rescue NoMethodError => e
  raise NoMethodError, "undefined method `#{e.name}' for #{inspect}"
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 99

def fields
  @fields
end

.source_node ⇒ Object (readonly)

Returns the value of attribute source_node.



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# File 'lib/graphql/client/query_result.rb', line 97

def source_node
  @source_node
end

Instance Attribute Details

#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 177

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 175

def errors
  @errors
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 101

def [](name)
  fields[name]
end

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



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# File 'lib/graphql/client/query_result.rb', line 114

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_node:, fields: {}) ⇒ Object

Internal



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# File 'lib/graphql/client/query_result.rb', line 41

def self.define(name:, source_node:, fields: {})
  Class.new(self) do
    @name = name
    @source_node = source_node
    @fields = {}

    fields.each do |field, type|
      @fields[field.to_sym] = type

      send :attr_reader, field

      # 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

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

      next unless field == "edges"
      class_eval <<-RUBY, __FILE__, __LINE__
        def each_node
          return enum_for(:each_node) unless block_given?
          edges.each { |edge| yield edge.node }
          self
        end
      RUBY
    end

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

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

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

.inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 110

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

.name ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 106

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 150

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

.spreads(node) ⇒ Object

Internal



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# File 'lib/graphql/client/query_result.rb', line 137

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(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 19

def self.wrap(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 = selection.selections.any? ? wrap(selection, name: "#{name}[:#{field_name}]") : nil
      fields[field_name] ? fields[field_name] |= field_klass : fields[field_name] = field_klass
    when Language::Nodes::InlineFragment
      wrap(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_node: node, fields: fields)
end

.|(other) ⇒ Object 



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

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_node: source_node, fields: new_fields)
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 180

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}"
  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 201

def respond_to_missing?(*args)
  super
end