Merge pull request #2581 from ericproulx/instance_to_s_delegation

Delegate #to_s to @instance in Grape::API::Instance

Author: dblock

CHANGELOG.md

@@ -7,6 +7,7 @@
 * [#2575](https://github.com/ruby-grape/grape/pull/2575): Refactor Api description class - [@ericproulx](https://github.com/ericproulx).
 * [#2577](https://github.com/ruby-grape/grape/pull/2577): Deprecate `return` in endpoint execution - [@ericproulx](https://github.com/ericproulx).
 * [#2580](https://github.com/ruby-grape/grape/pull/2580): Refactor endpoint helpers and error middleware integration - [@ericproulx](https://github.com/ericproulx).
+* [#2581](https://github.com/ruby-grape/grape/pull/2581): Delegate `to_s` in Grape::API::Instance - [@ericproulx](https://github.com/ericproulx).
 * [#2582](https://github.com/ruby-grape/grape/pull/2582): Fix leaky slash when normalizing - [@ericproulx](https://github.com/ericproulx).
 * Your contribution here.
 

lib/grape/api/instance.rb

@@ -19,11 +19,16 @@ class Instance
       Boolean = Grape::API::Boolean
 
       class << self
+        extend Forwardable
         attr_reader :instance, :base
         attr_accessor :configuration
 
+        def_delegators :base, :to_s
+
         def given(conditional_option, &block)
-          evaluate_as_instance_with_configuration(block, lazy: true) if conditional_option && block
+          return unless conditional_option
+
+          mounted(&block)
         end
 
         def mounted(&block)
@@ -35,10 +40,6 @@ def base=(grape_api)
           grape_api.instances << self
         end
 
-        def to_s
-          base&.to_s || super
-        end
-
         def base_instance?
           self == base.base_instance
         end