fix MOM download bug (#1009)

Author: oscarlevin

CHANGELOG.md

@@ -15,6 +15,7 @@ Instructions: Add a subsection under `[Unreleased]` for additions, fixes, change
 
 ### Fixed
 
+- Bug that caused MyOpenMath problems to be downloaded on every build, regardless of whether they were needed.
 - Bug which caused error in `pretext view` when the `running_servers` file contained a blank line.
 
 ## [2.20.0] - 2025-06-20

pretext/project/__init__.py

@@ -547,17 +547,18 @@ def ensure_myopenmath_xml(self) -> None:
 
             for prob_num in mom_prob_nums:
                 assert isinstance(prob_num, str)
+                log.debug(f"Checking for MyOpenMath problem {prob_num}")
                 if not (
-                    self.generated_dir_abspath() / "problems" / f"{prob_num}.xml"
+                    self.generated_dir_abspath() / "problems" / f"mom-{prob_num}.xml"
                 ).exists():
                     log.debug(
                         f"MyOpenMath problem {prob_num} does not exist, generating"
                     )
                     self.generate_assets(
                         requested_asset_types=["myopenmath"], only_changed=False
                     )
-                # Only need to generate once a single missing file is discovered.
-                break
+                    # Only need to generate once a single missing file is discovered.
+                    break
         else:
             log.debug("Source does not contain myopenmath problems")