Fix configuration.

Author: beauby

lib/generators/jsonapi/initializer/templates/initializer.rb

@@ -22,8 +22,9 @@
   # }
   #
   # # Set default exposures.
-  # config.jsonapi_expose = {
-  #   url_helpers: ::Rails.application.routes.url_helpers
+  # # A lambda/proc that will be eval'd in the controller context.
+  # config.jsonapi_expose = lambda {
+  #   { url_helpers: ::Rails.application.routes.url_helpers }
   # }
   #
   # # Set a default pagination scheme.

lib/jsonapi/rails.rb

@@ -1,3 +1,4 @@
 require 'jsonapi/deserializable'
 require 'jsonapi/serializable'
+require 'jsonapi/rails/configuration'
 require 'jsonapi/rails/railtie'

lib/jsonapi/rails/configuration.rb

@@ -20,8 +20,8 @@ class Configuration < ActiveSupport::InheritableOptions; end
       version: '1.0'
     }.freeze
 
-    DEFAULT_JSONAPI_EXPOSE = {
-      url_helpers: ::Rails.application.routes.url_helpers
+    DEFAULT_JSONAPI_EXPOSE = lambda {
+      { url_helpers: ::Rails.application.routes.url_helpers }
     }.freeze
 
     DEFAULT_JSONAPI_PAGINATION = ->(_) { nil }

lib/jsonapi/rails/controller.rb

@@ -107,7 +107,7 @@ def jsonapi_object
       # Hook for default exposures.
       # @return [Hash]
       def jsonapi_expose
-        JSONAPI::Rails.config[:jsonapi_expose]
+        instance_exec(&JSONAPI::Rails.config[:jsonapi_expose])
       end
 
       # Hook for pagination scheme.