Fix automatic translation request handling

crates/bds-core/src/engine/ai.rs

@@ -121,6 +121,42 @@ pub struct OneShotRequest {
     pub content: Value,
 }
 
+pub fn post_translation_request(
+    title: &str,
+    excerpt: Option<&str>,
+    content: &str,
+    target_language: &str,
+) -> OneShotRequest {
+    OneShotRequest {
+        operation: OneShotOperation::TranslatePost {
+            target_language: target_language.to_string(),
+        },
+        content: json!({
+            "title": title,
+            "excerpt": excerpt.unwrap_or_default(),
+            "content": content,
+        }),
+    }
+}
+
+pub fn media_translation_request(
+    title: Option<&str>,
+    alt: Option<&str>,
+    caption: Option<&str>,
+    target_language: &str,
+) -> OneShotRequest {
+    OneShotRequest {
+        operation: OneShotOperation::TranslateMedia {
+            target_language: target_language.to_string(),
+        },
+        content: json!({
+            "title": title.unwrap_or_default(),
+            "alt": alt.unwrap_or_default(),
+            "caption": caption.unwrap_or_default(),
+        }),
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct TaxonomySuggestion {
     pub tags: Vec<String>,
@@ -1477,6 +1513,33 @@ mod tests {
         );
     }
 
+    #[test]
+    fn translation_requests_normalize_missing_fields() {
+        let post = post_translation_request("Hello", None, "Body", "de");
+        assert_eq!(
+            post.operation,
+            OneShotOperation::TranslatePost {
+                target_language: "de".to_string()
+            }
+        );
+        assert_eq!(
+            post.content,
+            json!({"title": "Hello", "excerpt": "", "content": "Body"})
+        );
+
+        let media = media_translation_request(None, None, None, "fr");
+        assert_eq!(
+            media.operation,
+            OneShotOperation::TranslateMedia {
+                target_language: "fr".to_string()
+            }
+        );
+        assert_eq!(
+            media.content,
+            json!({"title": "", "alt": "", "caption": ""})
+        );
+    }
+
     #[test]
     fn run_one_shot_supports_image_analysis_via_airplane_endpoint() {
         let response = run_airplane_one_shot(

crates/bds-core/src/engine/auto_translation.rs

@@ -2,16 +2,11 @@ use std::collections::HashSet;
 use std::fs;
 use std::path::Path;
 
-use serde_json::json;
-
 use crate::db::DbConnection as Connection;
 use crate::db::queries::{
     media as qm, media_translation as qmt, post as qp, post_media, post_translation,
 };
-use crate::engine::ai::{
-    self, MediaTranslationResult, OneShotOperation, OneShotRequest, OneShotResponse,
-    TranslationResult,
-};
+use crate::engine::ai::{self, MediaTranslationResult, OneShotResponse, TranslationResult};
 use crate::engine::{EngineError, EngineResult};
 use crate::i18n::{UiLocale, translate, translate_with};
 use crate::model::{Media, Post, PostStatus};
@@ -445,16 +440,12 @@ fn translate_post_ai(
     match ai::run_one_shot(
         conn,
         offline_mode,
-        &OneShotRequest {
-            operation: OneShotOperation::TranslatePost {
-                target_language: language.to_string(),
-            },
-            content: json!({
-                "title": post.title,
-                "excerpt": post.excerpt,
-                "content": post.content,
-            }),
-        },
+        &ai::post_translation_request(
+            &post.title,
+            post.excerpt.as_deref(),
+            post.content.as_deref().unwrap_or_default(),
+            language,
+        ),
     )? {
         (OneShotResponse::Translation(result), _usage) => Ok(result),
         _ => Err(EngineError::Parse(
@@ -472,16 +463,12 @@ fn translate_media_ai(
     match ai::run_one_shot(
         conn,
         offline_mode,
-        &OneShotRequest {
-            operation: OneShotOperation::TranslateMedia {
-                target_language: language.to_string(),
-            },
-            content: json!({
-                "title": media.title,
-                "alt": media.alt,
-                "caption": media.caption,
-            }),
-        },
+        &ai::media_translation_request(
+            media.title.as_deref(),
+            media.alt.as_deref(),
+            media.caption.as_deref(),
+            language,
+        ),
     )? {
         (OneShotResponse::MediaTranslation(result), _usage) => Ok(result),
         _ => Err(EngineError::Parse(