moved some duplicate code to its own function

web/app/practice.py

             linked_resources = request.form.getlist('linked_resources')
             remove_linked_resources = request.form.getlist('remove_linked_resources')
 
-            if linked_resources:
-                for linked_resource in linked_resources:
-                    link = Resource.query.get(linked_resource)
-                    if existing_relationships and link not in existing_relationships:
-                        add_relationship(practice_id, linked_resource)
-                    elif not existing_relationships:
-                        add_relationship(practice_id, linked_resource)
-            if remove_linked_resources:
-                for remove_linked_resource in remove_linked_resources:
-                    delete_relationship(practice_id, remove_linked_resource)
+            edit_relationships(practice_id, linked_resources, remove_linked_resources, existing_relationships)
+
             return redirect(url_for('practice.get_practices',_external=True,_scheme=os.environ.get('SSL_SCHEME')))
 
     return render_template('edit.html', resource=practice, resource_dropdown=resource_dropdown, links=existing_relationships)

web/app/relationships.py

     deletion = Relationship.query.get(relation.id)
     db.session.delete(deletion)
     db.session.commit()
+    
+# logic for editing relationships 
+def edit_relationships(resource_id, linked_resources, remove_linked_resources, existing_relationships):
+    if linked_resources:
+        for linked_resource in linked_resources:
+            link = Resource.query.get(linked_resource)
+            if existing_relationships and link not in existing_relationships:
+                add_relationship(resource_id, linked_resource)
+            elif not existing_relationships:
+                add_relationship(resource_id, linked_resource)
+    if remove_linked_resources:
+        for remove_linked_resource in remove_linked_resources:
+            delete_relationship(resource_id, remove_linked_resource)

web/app/tool.py

             linked_resources = request.form.getlist('linked_resources')
             remove_linked_resources = request.form.getlist('remove_linked_resources')
 
-            if linked_resources:
-                for linked_resource in linked_resources:
-                    link = Resource.query.get(linked_resource)
-                    if existing_relationships and link not in existing_relationships:
-                        add_relationship(tool_id, linked_resource)
-                    elif not existing_relationships:
-                        add_relationship(tool_id, linked_resource)
-            if remove_linked_resources:
-                for remove_linked_resource in remove_linked_resources:
-                    delete_relationship(tool_id, remove_linked_resource)
+            edit_relationships(tool_id, linked_resources, remove_linked_resources, existing_relationships)
+            
             return redirect(url_for('tool.get_tools',_external=True,_scheme=os.environ.get('SSL_SCHEME')))
 
     return render_template('edit.html', resource=tool, resource_dropdown=resource_dropdown, links=existing_relationships)