Write Pyomo model artifacts — write

This mirrors write_jump() but targets Python/Pyomo. The function emits a model.py file containing component declarations, a data_loader.py helper that knows how to stream data from the saved model directory (or use embedded literals), and a lightweight solve.py runner.

Usage

write_pyomo(
  model,
  file = NULL,
  model_dir = NULL,
  solver_dir = "pyomo",
  model_name = "model",
  solver = "highs",
  use_folded = TRUE,
  cleanup = TRUE,
  data_mode = c("external", "embedded"),
  split = FALSE,
  export_vars = FALSE,
  export_data = FALSE,
  export_mps = FALSE,
  ...
)

Arguments

model: A multimod model object
file: Output file path (optional, overrides model_dir/solver_dir)
model_dir: Directory where model was saved with save_model() (contains model.rds)
solver_dir: Solver subdirectory name (default: "jump", e.g., "jump-highs", "jump-cplex")
model_name: Name for the JuMP model variable (default: "model")
solver: Python solver name passed to pyomo.opt.SolverFactory (default "highs").
use_folded: logical; whether to use folded equations if available (default: TRUE)
cleanup: logical; whether to remove existing solver_dir before generating new files (default: TRUE)
data_mode: Whether data should be stored externally in files ("external", default) or embedded directly inside the generated Python code ("embedded").
split: Logical flag controlling whether solver execution should live in a separate solve.py (when TRUE) or be embedded directly in model.py (default). The embedded mode mirrors the two-file workflow used by the other writers (model + data). Set split = TRUE to preserve the previous three-file scaffold.
export_vars: logical; whether to export variable values to CSV files in vars_export/ directory after solve (default: FALSE). Note: Solution is always saved to solution/ directory regardless of this setting (required for load_results).
export_data: logical; whether to export parameter data to CSV files in data_export/ directory (default: FALSE)
export_mps: logical or character; if TRUE, exports model to MPS format; if character, specifies filename (default: FALSE)
...: Additional arguments (not used)