#136: Add functionality to get a user by their ID

- The 'User' entity is currently hardcoded into get_entity_by_id, due to facing an issue with case sensitivity on Python ICAT's side. In the future, any entity should be able to use this code

common/python_icat_backend.py

@@ -5,7 +5,8 @@
 
 from common.backend import Backend
 from common.helpers import queries_records
-from common.python_icat_helpers import requires_session_id, get_session_details_helper, logout_icat_client, refresh_client_session
+from common.python_icat_helpers import requires_session_id, get_session_details_helper, logout_icat_client, \
+                                       refresh_client_session, get_entity_by_id
 from common.config import config
 from common.exceptions import AuthenticationError
 from common.models.db_models import SESSION
@@ -79,7 +80,7 @@ def count_with_filters(self, session_id, table, filters):
     @requires_session_id
     @queries_records
     def get_with_id(self, session_id, table, id):
-        pass
+        return get_entity_by_id(self.client, table, id)
 
     @requires_session_id
     @queries_records

common/python_icat_helpers.py

@@ -1,7 +1,7 @@
 from functools import wraps
 import logging
 from datetime import datetime, timedelta
-
+from icat.query import Query
 
 from icat.exception import ICATSessionError
 from common.exceptions import AuthenticationError
@@ -63,3 +63,29 @@ def logout_icat_client(client):
 
 def refresh_client_session(client):
     client.refresh()
+
+
+def construct_icat_query(client, entity_name, conditions=None):
+    return Query(client, entity_name, conditions=conditions)
+
+
+def execute_icat_query(client, query):
+    client.search(query)
+
+
+def get_entity_by_id(client, table, id):
+    id_condition = {'id': f'= {id}'}
+
+    # TODO - Sort out entities
+    id_query = construct_icat_query(client, "User", id_condition)
+
+    # TODO - Should all query executions be converted to strings?
+    query_result = client.search(id_query)
+    for result in query_result:
+        final_result = result.as_dict()
+
+        for key, value in final_result.items():
+            # Convert everything to strings so it can be converted into JSON
+            final_result[key] = str(final_result[key])
+
+    return final_result