Fix fetchn on queries with zero results

+dj/+internal/GeneralRelvar.m

@@ -289,7 +289,8 @@ function clip(self)
             for iArg=1:length(specs)
                 % if renamed, use the renamed attribute
                 name = regexp(specs{iArg}, '(\w+)\s*$', 'tokens');
-                if isnumeric(s(1).(name{1}{1})) && length(s(1).(name{1}{1})) == 1
+                sel = cellfun(@(x) strcmp(x, name{1}), {self.header.attributes.name});
+                if self.tableHeader.attributes(sel).isNumeric
                     varargout{iArg} = [s.(name{1}{1})]';
                 else
                     varargout{iArg} = {s.(name{1}{1})}';

LNX-docker-compose.yaml

@@ -1,4 +1,4 @@
-# docker-compose -f LNX-docker-compose.yaml --env-file LNX.env up --build --exit-code-from app
+# docker-compose -f LNX-docker-compose.yaml --env-file LNX.env up --exit-code-from app --build
 version: '2.2'
 x-net: &net
   networks:
@@ -29,7 +29,7 @@ services:
       interval: 1s
   fakeservices.datajoint.io:
     <<: *net
-    image: raphaelguzman/nginx:v0.0.11
+    image: datajoint/nginx:v0.0.15
     environment:
     - ADD_db_TYPE=DATABASE
     - ADD_db_ENDPOINT=db:3306
@@ -120,4 +120,4 @@ services:
       - ./tests:/tmp/tests
       - .:/src
 networks:
-  main:
+  main:

README.md

@@ -60,7 +60,7 @@ MYSQL_TAG=5.7
 | ---------------------------- | ------------------------------------------------------------------------------ |
 | Run all tests                | `run(Main)`                                                              |
 | Run one class of tests       | `run(TestTls)`                                                           |
-| Run one specific test        | `runtests('TestTls/testInsecureConn')`                                   |
+| Run one specific test        | `runtests('TestTls/TestTls_testInsecureConn')`                                   |
 | Run tests based on test name | `import matlab.unittest.TestSuite;`<br>`import matlab.unittest.selectors.HasName;`<br>`import matlab.unittest.constraints.ContainsSubstring;`<br>`suite = TestSuite.fromClass(?Main, ... `<br><code>&nbsp;&nbsp;&nbsp;&nbsp;</code>`HasName(ContainsSubstring('Conn')));`<br>`run(suite)`|
 
 

docs-parts/definition/07-Primary-Key_lang1.rst

@@ -1,4 +1,4 @@
 .. code-block:: matlab
 
-    key.scah_idx = fetch1(Scan & key, 'next=max(scan_idx)+1')
+    key.scan_idx = fetch1(Scan & key, 'max(scan_idx)+1 -> next')
 

docs-parts/intro/Releases_lang1.rst

@@ -1,3 +1,8 @@
+3.4.2 -- March 16, 2021
+--------------------------
+* Bugfix: Fetchn with zero results throws an error (#353) PR #???
+* Bugfix: Syntax error in documentation for next auto_increment value (#352) PR #???
+
 3.4.1 -- December 18, 2020
 --------------------------
 * Bugfix: Error on accessing unmanaged Imported/Computed tables (#336) PR #338

tests/TestFetch.m

@@ -242,6 +242,28 @@ function TestFetch_testNullable(testCase)
             testCase.verifyEqual(number(1),  NaN);
             testCase.verifyEqual(blob{1},  '');
         end
+        function TestFetch_testFetchn(testCase)
+            st = dbstack;
+            disp(['---------------' st(1).name '---------------']);
+            % related to % https://github.com/datajoint/datajoint-matlab/issues/353
+            package = 'University';
+
+            c1 = dj.conn(...
+                testCase.CONN_INFO.host,...
+                testCase.CONN_INFO.user,...
+                testCase.CONN_INFO.password,'',true);
+
+            dj.createSchema(package,[testCase.test_root '/test_schemas'], ...
+                [testCase.PREFIX '_university']);
+
+            q = University.A & 'id=999';
+            testCase.verifyEqual(q.fetchn('id'), []);
+            testCase.verifyEqual(q.fetchn('string'), {});
+            testCase.verifyEqual(q.fetchn('datetime'), {});
+            testCase.verifyEqual(q.fetchn('date'), {});
+            testCase.verifyEqual(q.fetchn('number'), []);
+            testCase.verifyEqual(q.fetchn('blob'), {});
+        end
         function TestFetch_testDescribe(testCase)
             st = dbstack;
             disp(['---------------' st(1).name '---------------']);