F reference field

Summary

Add a "Converter" that makes sure provided ids are valid

Focus

unit tests and implemented function

Test Environment

unittests

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• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
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src/caosadvancedtools/table_importer.py

@@ -31,6 +31,7 @@ import logging
 import pathlib
 from datetime import datetime
 
+import caosdb as db
 import numpy as np
 import pandas as pd
 from xlrd import XLRDError
@@ -56,6 +57,21 @@ def assure_name_format(name):
     return name
 
 
+def check_reference_field(ent_id, recordtype):
+    if 1 != db.execute_query("COUNT {} WIHT id={}".format(
+            recordtype,
+            ent_id),
+            unique=True):
+        raise ValueError(
+            "No {} with the supplied id={} exists. \n"
+            "Please supply a valid ID.".format(
+                recordtype,
+                ent_id
+            ))
+
+    return ent_id
+
+
 def yes_no_converter(val):
     """
     converts a string to True or False if possible.