Merge pull request #241 from datajoint/stage

Add check for sparse blobs

Author: eywalker

+dj/Relvar.m

@@ -249,6 +249,10 @@ function insert(self, tuples, command)
                             blobs{end+1} = char(v);  %#ok<AGROW>
                         end
                     elseif header.attributes(i).isBlob
+                        assert(~issparse(v), ...
+                            'DataJoint:DataType:Mismatch', ...
+                            'Sparse matrix in blob field `%s` is currently not supported', ...
+                            header.attributes(i).name);
                         valueStr = sprintf('%s"{M}",', valueStr);
                         blobs{end+1} = v;    %#ok<AGROW>
                     else
@@ -363,6 +367,10 @@ function update(self, attrname, value)
                     valueStr = '"{S}"';
                     value = {char(value)};
                 case header.attributes(ix).isBlob
+                    assert(~issparse(value), ...
+                        'DataJoint:DataType:Mismatch', ...
+                        'Sparse matrix in blob field `%s` is currently not supported', ...
+                        attrname);
                     valueStr = '"{M}"';
                     value = {value};
                 case header.attributes(ix).isNumeric