#399

frontend/src/lib/postImportRows.ts

@@ -16,6 +16,10 @@ const rowChanged = (
     || JSON.stringify (previous.provenance) !== JSON.stringify (next.provenance)
     || JSON.stringify (previous.tagSources ?? { }) !== JSON.stringify (next.tagSources ?? { })
 
+const buildResetSnapshot = (row: PostImportRow) => ({
+    url: row.url,
+    attributes: row.attributes })
+
 
 export const processableImportRows = (rows: PostImportRow[]): PostImportRow[] =>
     rows.filter (row => {
@@ -111,7 +115,11 @@ export const mergeValidatedImportRows = (
 		: previous.baseWarnings,
 	    validationErrors: row.validationErrors,
 	    status: row.status,
-	    metadataUrl: row.metadataUrl }
+	    metadataUrl: row.metadataUrl,
+	    resetSnapshot:
+		row.metadataUrl !== previous.metadataUrl
+		? buildResetSnapshot (row)
+		: previous.resetSnapshot }
     })
 }
 
@@ -154,6 +162,7 @@ export const mergePreviewImportRows = (
 	    tagSources: mergedTagSources,
 	    skipReason: row.skipReason,
 	    existingPostId: row.existingPostId,
+	    resetSnapshot: row.resetSnapshot,
 	    createdPostId: previous.createdPostId,
 	    importStatus: previous.importStatus,
 	    importErrors: previous.importErrors }
@@ -214,3 +223,8 @@ export const retryImportRow = (
 	row.sourceRow === sourceRow && row.importStatus === 'failed'
 	? { ...row, importStatus: 'pending', importErrors: undefined }
 	: row)
+
+export const initialisePreviewRows = (rows: PostImportRow[]): PostImportRow[] =>
+    rows.map (row => ({
+	...row,
+	resetSnapshot: buildResetSnapshot (row) }))