Add constraints

constraints.py

# Add Constraints: No Overlapping of tasks for the same machine
# Create and add disjunctive constraints.
for machine in all_machines:
    model.AddNoOverlap(machine_to_intervals[machine])

# Precedences inside a job: End Time of Step n is before starting time of Step n+1
for job_id, job in enumerate(jobs_data):
    for task_id in range(len(job) - 1):
        model.Add(all_tasks[job_id, task_id +
                            1].start >= all_tasks[job_id, task_id].end)
                            
# Objective: Minimize Makespan
obj_var = model.NewIntVar(0, horizon, 'makespan')
model.AddMaxEquality(obj_var, [
    all_tasks[job_id, len(job) - 1].end
    for job_id, job in enumerate(jobs_data)
])
model.Minimize(obj_var)

# Declare Solver Model
solver = cp_model.CpSolver()
status = solver.Solve(model)