rails g graphql:install

Author: tsugitta

app/controllers/graphql_controller.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+class GraphqlController < ApplicationController
+  # If accessing from outside this domain, nullify the session
+  # This allows for outside API access while preventing CSRF attacks,
+  # but you'll have to authenticate your user separately
+  # protect_from_forgery with: :null_session
+
+  def execute
+    variables = prepare_variables(params[:variables])
+    query = params[:query]
+    operation_name = params[:operationName]
+    context = {
+      # Query context goes here, for example:
+      # current_user: current_user,
+    }
+    result = GraphqlRubyIssueReproductionSchema.execute(query, variables: variables, context: context, operation_name: operation_name)
+    render json: result
+  rescue StandardError => e
+    raise e unless Rails.env.development?
+    handle_error_in_development(e)
+  end
+
+  private
+
+  # Handle variables in form data, JSON body, or a blank value
+  def prepare_variables(variables_param)
+    case variables_param
+    when String
+      if variables_param.present?
+        JSON.parse(variables_param) || {}
+      else
+        {}
+      end
+    when Hash
+      variables_param
+    when ActionController::Parameters
+      variables_param.to_unsafe_hash # GraphQL-Ruby will validate name and type of incoming variables.
+    when nil
+      {}
+    else
+      raise ArgumentError, "Unexpected parameter: #{variables_param}"
+    end
+  end
+
+  def handle_error_in_development(e)
+    logger.error e.message
+    logger.error e.backtrace.join("\n")
+
+    render json: { errors: [{ message: e.message, backtrace: e.backtrace }], data: {} }, status: 500
+  end
+end

app/graphql/graphql_ruby_issue_reproduction_schema.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class GraphqlRubyIssueReproductionSchema < GraphQL::Schema
+  mutation(Types::MutationType)
+  query(Types::QueryType)
+
+  # For batch-loading (see https://graphql-ruby.org/dataloader/overview.html)
+  use GraphQL::Dataloader
+
+  # GraphQL-Ruby calls this when something goes wrong while running a query:
+  def self.type_error(err, context)
+    # if err.is_a?(GraphQL::InvalidNullError)
+    #   # report to your bug tracker here
+    #   return nil
+    # end
+    super
+  end
+
+  # Union and Interface Resolution
+  def self.resolve_type(abstract_type, obj, ctx)
+    # TODO: Implement this method
+    # to return the correct GraphQL object type for `obj`
+    raise(GraphQL::RequiredImplementationMissingError)
+  end
+
+  # Limit the size of incoming queries:
+  max_query_string_tokens(5000)
+
+  # Stop validating when it encounters this many errors:
+  validate_max_errors(100)
+
+  # Relay-style Object Identification:
+
+  # Return a string UUID for `object`
+  def self.id_from_object(object, type_definition, query_ctx)
+    # For example, use Rails' GlobalID library (https://github.com/rails/globalid):
+    object.to_gid_param
+  end
+
+  # Given a string UUID, find the object
+  def self.object_from_id(global_id, query_ctx)
+    # For example, use Rails' GlobalID library (https://github.com/rails/globalid):
+    GlobalID.find(global_id)
+  end
+end

app/graphql/mutations/.keep

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module Mutations
+  class BaseMutation < GraphQL::Schema::RelayClassicMutation
+    argument_class Types::BaseArgument
+    field_class Types::BaseField
+    input_object_class Types::BaseInputObject
+    object_class Types::BaseObject
+  end
+end

app/graphql/mutations/base_mutation.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Resolvers
+  class BaseResolver < GraphQL::Schema::Resolver
+  end
+end

app/graphql/resolvers/base_resolver.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Types
+  class BaseArgument < GraphQL::Schema::Argument
+  end
+end

app/graphql/types/.keep

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Types
+  class BaseConnection < Types::BaseObject
+    # add `nodes` and `pageInfo` fields, as well as `edge_type(...)` and `node_nullable(...)` overrides
+    include GraphQL::Types::Relay::ConnectionBehaviors
+  end
+end

app/graphql/types/base_argument.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Types
+  class BaseEdge < Types::BaseObject
+    # add `node` and `cursor` fields, as well as `node_type(...)` override
+    include GraphQL::Types::Relay::EdgeBehaviors
+  end
+end

app/graphql/types/base_connection.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Types
+  class BaseEnum < GraphQL::Schema::Enum
+  end
+end