support sequential mutation fields

Author: rmosolgo

lib/graphql/execution/interpreter/runtime.rb

@@ -39,20 +39,29 @@ def initialize(dataloader:, lazies_at_depth:)
             @next_flush = []
             @dataloader = dataloader
             @lazies_at_depth = lazies_at_depth
+            @running_eagerly = false
           end
 
           def <<(step)
-            @next_flush << step
+            if @running_eagerly
+              step.run
+            else
+              @next_flush << step
+            end
           end
 
-          def complete
+          def complete(eager: false)
+            prev_eagerly = @running_eagerly
+            @running_eagerly = eager
             while (fl = @next_flush) && !fl.empty?
               @next_flush = []
               while (step = fl.shift)
                 step.run
               end
               Interpreter::Resolve.resolve_each_depth(@lazies_at_depth, @dataloader)
             end
+          ensure
+            @running_eagerly = prev_eagerly
           end
         end
 
@@ -65,7 +74,7 @@ def complete
         # @return [GraphQL::Query::Context]
         attr_reader :context
 
-        attr_reader :dataloader
+        attr_reader :dataloader, :run_queue
 
         def initialize(query:, lazies_at_depth:)
           @query = query

lib/graphql/execution/interpreter/runtime/graphql_result.rb

@@ -63,13 +63,13 @@ def run
               @ordered_result_keys ||= ordered_result_keys
               if is_selection_array
                 selections_result = GraphQLResultHash.new(
-                  @graphql_response_name,
+                  @graphql_result_name,
                   @graphql_result_type,
                   @graphql_application_value,
                   @graphql_parent,
                   @graphql_is_non_null_in_parent,
                   gathered_selections,
-                  false,
+                  @graphql_is_eager,
                   @ast_node,
                   @graphql_arguments,
                   @graphql_field)
@@ -106,6 +106,7 @@ def run
                           selections_result.merge_into(target_result)
                         end
                       end
+                      @runtime.run_queue.complete(eager: true)
                       @runtime.dataloader.clear_cache
                     }
                   else