Allow both dry-validation 0.x and 1.x

This backports the changes done in master in 5d8819f but tries to avoid changing the interface through the use of a class method #call and a Dry::Validation::Result wrapping class using SimpleDelegator that defines #messages.

app/services/hyrax/workflow/workflow_schema.rb

@@ -14,47 +14,107 @@ module Workflow
     # @see Sipity::Notification
     # @see Sipity::Method
     # @see ./lib/generators/hyrax/templates/workflow.json.erb
-    WorkflowSchema = Dry::Validation.Schema do
-      configure do
-        def self.messages
-          Dry::Validation::Messages.default.merge(
-            en: { errors: { constant_name?: 'must be an initialized Ruby constant' } }
-          )
+
+    # If using dry-validation < 1, create a Dry::Validation::Schema for backwards-compatibility.
+    # This schema should never ever change.  If you need to modify it, upgrade to dry-validation >= 1
+    # and use the Dry::Validation::Contract subclass below.
+    if defined? Dry::Validation::Schema
+      Deprecation.warn(self, 'The Dry::Validation::Schema implemenation of Hyrax::Workflow::WorkflowSchema is deprecated. ' \
+                       'Please upgrade to dry-validation >= 1 to use the Dry::Validation::Contract implementation which will be part of Hyrax 3.0')
+      WorkflowSchema = Dry::Validation.Schema do
+        configure do
+          def self.messages
+            Dry::Validation::Messages.default.merge(
+              en: { errors: { constant_name?: 'must be an initialized Ruby constant' } }
+            )
+          end
+
+          def constant_name?(value)
+            value.constantize
+            true
+          rescue NameError
+            false
+          end
         end
 
-        def constant_name?(value)
-          value.constantize
-          true
-        rescue NameError
-          false
+        required(:workflows).each do
+          required(:name).filled(:str?) # Sipity::Workflow#name
+          optional(:label).filled(:str?) # Sipity::Workflow#label
+          optional(:description).filled(:str?) # Sipity::Workflow#description
+          optional(:allows_access_grant).filled(:bool?) # Sipity::Workflow#allows_access_grant?
+          required(:actions).each do
+            schema do
+              required(:name).filled(:str?) # Sipity::WorkflowAction#name
+              required(:from_states).each do
+                schema do
+                  required(:names) { array? { each(:str?) } } # Sipity::WorkflowState#name
+                  required(:roles) { array? { each(:str?) } } # Sipity::Role#name
+                end
+              end
+              optional(:transition_to).filled(:str?) # Sipity::WorkflowState#name
+              optional(:notifications).each do
+                schema do
+                  required(:name).value(:constant_name?) # Sipity::Notification#name
+                  required(:notification_type).value(included_in?: Sipity::Notification.valid_notification_types)
+                  required(:to) { array? { each(:str?) } }
+                  optional(:cc) { array? { each(:str?) } }
+                  optional(:bcc) { array? { each(:str?) } }
+                end
+              end
+              optional(:methods) { array? { each(:str?) } } # See it_behaves_like "a Hyrax workflow method"
+            end
+          end
         end
       end
+    elsif defined? Dry::Validation::Contract
+      # For dry-validation >= 1
+      class WorkflowSchema < Dry::Validation::Contract
+        class Types
+          include Dry::Types()
 
-      required(:workflows).each do
-        required(:name).filled(:str?) # Sipity::Workflow#name
-        optional(:label).filled(:str?) # Sipity::Workflow#label
-        optional(:description).filled(:str?) # Sipity::Workflow#description
-        optional(:allows_access_grant).filled(:bool?) # Sipity::Workflow#allows_access_grant?
-        required(:actions).each do
-          schema do
-            required(:name).filled(:str?) # Sipity::WorkflowAction#name
-            required(:from_states).each do
-              schema do
-                required(:names) { array? { each(:str?) } } # Sipity::WorkflowState#name
-                required(:roles) { array? { each(:str?) } } # Sipity::Role#name
-              end
+          Constant = Types::Class.constructor do |v|
+            begin
+              v.constantize
+            rescue NameError => _err
+              v
             end
-            optional(:transition_to).filled(:str?) # Sipity::WorkflowState#name
-            optional(:notifications).each do
-              schema do
-                required(:name).value(:constant_name?) # Sipity::Notification#name
+          end
+        end
+
+        # Wrap the result for backwards-compatibility. This will be removed in Hyrax 3.0.
+        class ResultWrapper < SimpleDelegator
+          def messages(opts = {})
+            errors(opts)
+          end
+        end
+
+        # Provide a class method for backwards-compatibility. This will be removed in Hyrax 3.0.
+        def self.call(data)
+          ResultWrapper.new(new.call(data))
+        end
+
+        params do
+          required(:workflows).array(:hash) do
+            required(:name).filled(:string) # Sipity::Workflow#name
+            optional(:label).filled(:string) # Sipity::Workflow#label
+            optional(:description).filled(:string) # Sipity::Workflow#description
+            optional(:allows_access_grant).filled(:bool) # Sipity::Workflow#allows_access_grant?
+            required(:actions).array(:hash) do
+              required(:name).filled(:string) # Sipity::WorkflowAction#name
+              required(:from_states).array(:hash) do
+                required(:names) { array? { each(:string) } } # Sipity::WorkflowState#name
+                required(:roles) { array? { each(:string) } } # Sipity::Role#name
+              end
+              optional(:transition_to).filled(:string) # Sipity::WorkflowState#name
+              optional(:notifications).array(:hash) do
+                required(:name).value(Types::Constant) # Sipity::Notification#name
                 required(:notification_type).value(included_in?: Sipity::Notification.valid_notification_types)
-                required(:to) { array? { each(:str?) } }
-                optional(:cc) { array? { each(:str?) } }
-                optional(:bcc) { array? { each(:str?) } }
+                required(:to) { array? { each(:string) } }
+                optional(:cc) { array? { each(:string) } }
+                optional(:bcc) { array? { each(:string) } }
               end
             end
-            optional(:methods) { array? { each(:str?) } } # See it_behaves_like "a Hyrax workflow method"
+            optional(:methods) { array? { each(:string) } } # See it_behaves_like "a Hyrax workflow method"
           end
         end
       end

hyrax.gemspec

@@ -40,9 +40,9 @@ SUMMARY
   spec.add_dependency 'carrierwave', '~> 1.0'
   spec.add_dependency 'clipboard-rails', '~> 1.5'
   spec.add_dependency 'dry-equalizer', '~> 0.2'
-  spec.add_dependency 'dry-struct', '~> 0.1'
+  spec.add_dependency 'dry-struct', '>= 0.1', '< 2.0'
   spec.add_dependency 'dry-transaction', '~> 0.11'
-  spec.add_dependency 'dry-validation', '~> 0.9'
+  spec.add_dependency 'dry-validation', '>= 0.9', '< 2.0'
   spec.add_dependency 'flipflop', '~> 2.3'
   # Pin more tightly because 0.x gems are potentially unstable
   spec.add_dependency 'flot-rails', '~> 0.0.6'