Class: GraphQL::Client::QueryResult

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

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 176

def method_missing(*args)
  super
rescue NoMethodError => e
  raise NoMethodError, "undefined method `#{e.name}' for #{inspect}"
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 165

def data
  @data
end

Class Method Details

.cast(obj) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 104

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

    if !spreads.include?(self.source_node.name)
      message = "couldn't cast #{obj.inspect} to #{self.inspect}\n\n"
      suggestion = "\n  ...#{name || "YourFragment"} # SUGGESTION"
      message << GraphQL::Language::Generation.generate(obj.class.source_node).sub(/\n}$/, "#{suggestion}\n}")
      raise TypeError, message
    end
    cast(obj.to_h)
  when Array
    obj.map { |e| cast(e) }
  when NilClass
    nil
  else
    raise TypeError, "#{obj.class}"
  end
end

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

Internal



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# File 'lib/graphql/client/query_result.rb', line 32

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)
      if field != field_alias
        send :alias_method, field_alias, field
      end

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

      if 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
    end

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

    class_eval <<-RUBY, __FILE__, __LINE__
      def initialize(data)
        @data = data
        #{assigns.join("\n")}
        freeze
      end
    RUBY
  end
end

.fields ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 92

def self.fields
  @fields
end

.inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 100

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

.name ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 96

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

.new(obj) ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 143

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

.source_node ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 88

def self.source_node
  @source_node
end

.spreads(node) ⇒ Object

Internal



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# File 'lib/graphql/client/query_result.rb', line 130

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 11

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

  node.selections.each do |selection|
    case selection
    when Language::Nodes::FragmentSpread
    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 152

def self.|(other)
  new_fields = self.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: self.source_node, fields: new_fields)
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/graphql/client/query_result.rb', line 168

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