PLU-591: [show-multiple-rows-3]: add preprocess to postman email

packages/backend/src/apps/postman/actions/send-transactional-email/index.ts

@@ -4,6 +4,8 @@ import { SafeParseError } from 'zod'
 import { fromZodError } from 'zod-validation-error'
 
 import StepError from '@/errors/step'
+import { TableVariableMarker } from '@/helpers/compute-parameters'
+import { formatTable, TableData } from '@/helpers/format-table-variable'
 import logger from '@/helpers/logger'
 import Step from '@/models/step'
 
@@ -22,12 +24,49 @@ import { sendInvalidAttachmentsEmail } from '../../common/send-invalid-attachmen
 import { throwPostmanStepError } from '../../common/throw-errors'
 
 import getDataOutMetadata from './get-data-out-metadata'
+/**
+ * Type guard to check if a value is a TableVariableMarker
+ */
+function isTableMarker(value: unknown): value is TableVariableMarker {
+  return (
+    typeof value === 'object' &&
+    value !== null &&
+    '__type' in value &&
+    (value as TableVariableMarker).__type === 'table'
+  )
+}
 
 const action: IRawAction = {
   name: 'Send email',
   key: 'sendTransactionalEmail',
   description: 'Sends an email using Postman',
   arguments: transactionalEmailFields,
+
+  preprocessVariable(key: string, value: unknown) {
+    // Handle table variable markers - convert to HTML table
+    if (isTableMarker(value)) {
+      // Only allow table rendering in the body field
+      if (key !== 'body') {
+        // Return placeholder for unsupported fields
+        return '[Table variables are only supported in the email body]'
+      }
+
+      const result = formatTable(value.data as TableData, {
+        selectedColumnIds: value.selectedColumnIds,
+      })
+
+      if (result.success === false) {
+        // Return error message as placeholder instead of failing the step
+        return `[Table Error: ${result.message}]`
+      }
+
+      return result.output
+    }
+
+    // Return unchanged for non-table values
+    return value
+  },
+
   doesFileProcessing: (step: Step) => {
     return (
       step.parameters.attachments &&

packages/backend/src/apps/postman/common/parameters.ts

@@ -43,6 +43,14 @@ export const transactionalEmailFields: IField[] = [
     type: 'rich-text' as const,
     required: true,
     variables: true,
+    variableTypes: [
+      'text',
+      'array',
+      'tile_row_id',
+      'approval',
+      'ai_response',
+      'table',
+    ],
   },
   {
     label: 'Recipient email(s)',

packages/types/index.d.ts

@@ -487,6 +487,7 @@ export type TRteMenuOption =
 export interface IFieldRichText extends IBaseField {
   type: 'rich-text'
   value?: string
+  variableTypes?: TDataOutMetadatumType[]
 
   // Specifies the order and what menu options to show in the RTE
   // 'Divider' is specified manually to determine when a divider should be shown