fix: correctly pass slice_size argument

Author: FabianHofmann

doc/release_notes.rst

@@ -4,6 +4,11 @@ Release Notes
 .. Upcoming Version
 .. ----------------
 
+Version 0.4.1
+--------------
+
+* Fix the `slice_size` argument in the `solve` function. The argument was not properly passed to the `to_file` function.
+
 Version 0.4.0
 --------------
 

linopy/model.py

@@ -1124,7 +1124,9 @@ def solve(
                     env=env,
                 )
             else:
-                problem_fn = self.to_file(to_path(problem_fn), io_api)
+                problem_fn = self.to_file(
+                    to_path(problem_fn), io_api, slice_size=slice_size
+                )
                 result = solver.solve_problem_from_file(
                     problem_fn=to_path(problem_fn),
                     solution_fn=to_path(solution_fn),