use cache_dir instead of output_dir

Author: montesmariana

pydra/engine/core.py

@@ -1189,21 +1189,22 @@ def _collect_outputs(self):
                     )
         return attr.evolve(output, **output_wf)
 
-    def create_dotfile(self, type="simple", export=None, name=None):
+    def create_dotfile(self, type="simple", export=None, name=None, output_dir = None):
         """creating a graph - dotfile and optionally exporting to other formats"""
+        outdir = output_dir if output_dir is not None else self.cache_dir
         if not name:
             name = f"graph_{self.name}"
         if type == "simple":
             for task in self.graph.nodes:
                 self.create_connections(task)
             dotfile = self.graph.create_dotfile_simple(
-                outdir=self.output_dir, name=name
+                outdir=outdir, name=name
             )
         elif type == "nested":
             for task in self.graph.nodes:
                 self.create_connections(task)
             dotfile = self.graph.create_dotfile_nested(
-                outdir=self.output_dir, name=name
+                outdir=outdir, name=name
             )
         elif type == "detailed":
             # create connections with detailed=True
@@ -1213,7 +1214,7 @@ def create_dotfile(self, type="simple", export=None, name=None):
             for (wf_out, lf) in self._connections:
                 self.graph.add_edges_description((self.name, wf_out, lf.name, lf.field))
             dotfile = self.graph.create_dotfile_detailed(
-                outdir=self.output_dir, name=name
+                outdir=outdir, name=name
             )
         else:
             raise Exception(