feat(workflows): delete definitions

messages/uniworx/de-de-formal.msg

@@ -2802,3 +2802,7 @@ WorkflowDefinitionEditTitle: Workflow-Definition Bearbeiten
 WorkflowDefinitionListTitle: Workflow-Definitionen
 WorkflowDefinitionInstanceCount: Instanzen
 WorkflowDefinitionWorkflowCount: Workflows
+WorkflowDefinitionConcreteInstanceCount num@Int64: #{num} Instanzen
+WorkflowDefinitionConcreteWorkflowCount num@Int64: #{num} Workflows
+WorkflowDefinitionDeleteQuestion: Wollen Sie die unten aufgeführte Workflow-Definition wirklich löschen?
+WorkflowDefinitionDeleted: Workflow-Definition gelöscht

src/Handler/Workflow/Definition/Delete.hs

@@ -4,6 +4,49 @@ module Handler.Workflow.Definition.Delete
 
 import Import
 
+import Handler.Utils.Delete
+
+import qualified Database.Esqueleto as E
+
+import qualified Data.Set as Set
+
+
 getAWDDeleteR, postAWDDeleteR :: WorkflowInstanceScope' -> WorkflowDefinitionName -> Handler Html
 getAWDDeleteR = postAWDDeleteR
-postAWDDeleteR = error "not implemented"
+postAWDDeleteR wds' wdn = do
+  wdId <- runDB . getKeyBy404 $ UniqueWorkflowDefinition wdn wds'
+  deleteR DeleteRoute
+    { drRecords = Set.singleton wdId
+    , drGetInfo = \workflowDefinition -> do
+        let instanceCount = E.subSelectCount . E.from $ \workflowInstance ->
+              E.where_ $ workflowInstance E.^. WorkflowInstanceDefinition E.==. E.just (workflowDefinition E.^. WorkflowDefinitionId)
+            workflowCount = E.subSelectCount . E.from $ \(workflowInstance `E.InnerJoin` workflow) -> do
+              E.on $ workflow E.^. WorkflowWorkflowInstance E.==. E.just (workflowInstance E.^. WorkflowInstanceId)
+              E.where_ $ workflowInstance E.^. WorkflowInstanceDefinition E.==. E.just (workflowDefinition E.^. WorkflowDefinitionId)
+        return ( workflowDefinition E.^. WorkflowDefinitionScope
+               , workflowDefinition E.^. WorkflowDefinitionName
+               , instanceCount, workflowCount
+               )
+    , drUnjoin = id
+    , drRenderRecord = \(E.Value scope, E.Value name, E.Value instanceCount, E.Value workflowCount) ->
+        return [whamlet|
+          $newline never
+          #{name}
+          \ (_{scope}
+          $if instanceCount > 0
+            ; _{MsgWorkflowDefinitionConcreteInstanceCount instanceCount}
+          $if workflowCount > 0
+            ; _{MsgWorkflowDefinitionConcreteWorkflowCount workflowCount}
+          )
+        |]
+    , drRecordConfirmString  = \(E.Value scope, E.Value name, _, _) ->
+        return [st|#{toPathPiece scope}.#{name}|]
+    , drCaption = SomeMessage MsgWorkflowDefinitionDeleteQuestion
+    , drSuccessMessage = SomeMessage MsgWorkflowDefinitionDeleted
+    , drFormMessage = const $ return Nothing
+    , drAbort = SomeRoute AdminWorkflowDefinitionListR
+    , drSuccess = SomeRoute AdminWorkflowDefinitionListR
+    , drDelete = \k cascade -> do
+        updateWhere [WorkflowInstanceDefinition ==. Just k] [WorkflowInstanceDefinition =. Nothing]
+        cascade
+    }