numerous improvemts

gen_cons.py

@@ -121,6 +121,14 @@ def main(
             constraint=[],
         ),
     )
+    Rota.allow_shifts_together(
+        
+            "oncall weekday",
+            "Oncall weekend",
+            "weekend a",
+            "evening",
+        
+    )
 
     # Rota.add_grade_constraint_by_week([2], [1, 2], ["night_weekday", "night_weekend"])
 

output/timetable.css

@@ -321,4 +321,8 @@ table.transposed th.bank-holiday {
 
 .locum-shift {
     background-color: lightgreen;
+}
+
+.multi-shift {
+    line-height: 1;
 }

output/timetable.js

@@ -295,7 +295,10 @@ $(".table-div .worker-row .worker").each((n, tr) => {
     locum_shift_counts = jtr.data("locum-shift-counts")
     shift_targets = jtr.data("worker-targets")
 
+    console.log(shift_counts, locum_shift_counts, shift_targets)
+
     oshifts.forEach((s) => {
+        console.log(s, shift_counts, shift_targets, locum_shift_counts)
         if (s in shift_targets && shift_targets[s] > 0) {
             if (s in shift_counts) {
                 c = shift_counts[s];
@@ -426,6 +429,7 @@ $(".table-div + pre").each((n, pre) => {
 
 })
 
+
 $("td").hover((e) => {
     // start hover
     worker_td = $(e.target).closest('tr').find('td:first')[0]
@@ -436,31 +440,37 @@ $("td").hover((e) => {
             $($(el).closest('tr').find('td').get(index)).addClass("pair-match")
         })
     }
-    if (e.target.dataset.shift != undefined && e.target.dataset.shift.length > 0) {
-        // Highlight all cells containing this shift, even if multiple shifts per day
-        $("td").filter(function() {
-            let shifts = $(this).attr("data-shift");
-            if (!shifts) return false;
-            return shifts.split(",").map(s => s.trim()).includes(e.target.dataset.shift);
-        }).addClass("shift-highlight");
 
-        // For remote site, similar logic if needed
+    // Find the span under the mouse, if any
+    let targetSpan = $(e.target).closest("span.multi-shift-shift").get(0) || 
+                     ($(e.target).hasClass("multi-shift-shift") ? e.target : null);
+
+    if (targetSpan) {
+        // Only highlight spans with the same text
+        let shiftDisplay = $(targetSpan).text().trim();
+        $("span.multi-shift-shift").filter(function() {
+            return $(this).text().trim() === shiftDisplay;
+        }).addClass("shift-highlight");
+    } else if (e.target.dataset.shift != undefined && e.target.dataset.shift.length > 0) {
+        // Fallback: highlight all cells containing ANY of the hovered shifts (legacy)
+        let hovered_shifts = e.target.dataset.shift.split(",").map(s => s.trim());
         $("td").filter(function() {
             let shifts = $(this).attr("data-shift");
-            let remote = $(this).attr("data-remote-site");
             if (!shifts) return false;
-            return shifts.split(",").map(s => s.trim()).includes(e.target.dataset.shift) &&
+            let cell_shifts = shifts.split(",").map(s => s.trim());
-                   remote == e.target.dataset.shiftRemoteSite;
+            return hovered_shifts.some(s => cell_shifts.includes(s));
-        }).addClass("remote-site-match");
+        }).addClass("shift-highlight");
     }
 
 }, (e) => {
     // end hover
     $("td.pair-match").removeClass("pair-match")
     $("td.shift-highlight").removeClass("shift-highlight")
+    $("span.shift-highlight").removeClass("shift-highlight")
     $("td.remote-site-match").removeClass("remote-site-match")
 });
 
+
 $("#rota-table tr td:first-child").each((n, td) => {
     $(td).click(() => {
         viewWorker(td);

rota/shifts.py

@@ -257,7 +257,7 @@ class RotaBuilder(object):
 
         self.SHIFT_BOUNDS = SHIFT_BOUNDS
         self.shifts: List[SingleShift] = []  # type List[SingleShift]
-        self.allowed_multi_shift_sets: list[set[str]] = []
+        #self.allowed_multi_shift_sets: list[set[str]] = []
 
         self.use_previous_shifts = use_previous_shifts
         self.use_shift_balance_extra = use_shift_balance_extra
@@ -603,6 +603,16 @@ class RotaBuilder(object):
                 initialize=0,
             )
 
+        self.model.multi_shift_together = Var(
+            ((worker.id, week, day, idx)
+            for worker in self.workers
+            for week, day in self.get_week_day_combinations()
+            for idx, allowed_set in enumerate(getattr(worker, "allowed_multi_shift_sets", []))
+            if allowed_set.issubset(self.get_shift_names_by_week_day(week, day))),
+            domain=Binary,
+            initialize=0,
+        )
+
         # Used to limit number of workers on night shift per site
         # if we force a binary it will in effect hard constrain to < 2
         # from a single site
@@ -1398,6 +1408,25 @@ class RotaBuilder(object):
             )
             logging.debug(f"Generate worker constraints: {worker.name}")
 
+            for week, day in self.get_week_day_combinations():
+                shifts_today = self.get_shift_names_by_week_day(week, day)
+                worker_allowed_sets = getattr(worker, "allowed_multi_shift_sets", [])
+                #for idx, allowed_set in enumerate(worker_allowed_sets):
+                #    if allowed_set.issubset(shifts_today):
+                #        var = self.model.multi_shift_together[worker.id, week, day, idx]
+                #        self.model.constraints.add(
+                #            sum(self.model.works[worker.id, week, day, shift] for shift in allowed_set)
+                #            == len(allowed_set) * var
+                #        )
+                for idx, allowed_set in enumerate(worker_allowed_sets):
+                    if allowed_set.issubset(shifts_today):
+                        var = self.model.multi_shift_together[worker.id, week, day, idx]
+                        # var is 1 iff all shifts in allowed_set are assigned
+                        for shift in allowed_set:
+                            self.model.constraints.add(var <= self.model.works[worker.id, week, day, shift])
+                        self.model.constraints.add(
+                            var >= sum(self.model.works[worker.id, week, day, shift] for shift in allowed_set) - len(allowed_set) + 1
+                        )
 
 
             if self.get_workers_who_require_locums():
@@ -2416,55 +2445,40 @@ class RotaBuilder(object):
 
                     # single shift per day (unless multi-shift allowed)
                     # This is signifantly slower so only enable if required
-                    if self.allowed_multi_shift_sets:
+                    shifts_today = self.get_shift_names_by_week_day(week, day)
-                        shifts_today = self.get_shift_names_by_week_day(week, day)
+                    assigned_vars = [self.model.works[worker.id, week, day, shift] for shift in shifts_today]
-                        if shifts_today:
+                    worker_allowed_sets = getattr(worker, "allowed_multi_shift_sets", [])
-                            # Build all allowed sets that are subsets of today's shifts
+                    allowed_sets_today = [
-                            allowed_sets_today = [
+                        allowed_set for allowed_set in worker_allowed_sets
-                                allowed_set for allowed_set in self.allowed_multi_shift_sets
+                        if allowed_set.issubset(shifts_today)
-                                if allowed_set.issubset(shifts_today)
+                    ]
-                            ]
 
-                            # For each possible assignment, only allow:
+                    if allowed_sets_today:
-                            # - a single shift
+                        # Forbid any multi-shift assignment that includes shifts from different allowed sets
-                            # - OR exactly one of the allowed sets
+                        # Build all possible multi-shift assignments
-                            assigned_vars = [self.model.works[worker.id, week, day, shift] for shift in shifts_today]
+                        all_multi = [set(c) for i in range(2, len(shifts_today)+1) for c in itertools.combinations(shifts_today, i)]
-                            # The sum of assigned shifts must be 1 (single shift) or exactly len(allowed_set) for one allowed set
+                        # Build all allowed multi-shift patterns (all non-empty subsets of each allowed set)
-                            allowed_sums = [1] + [len(allowed_set) for allowed_set in allowed_sets_today]
+                        allowed_patterns = [{shift} for shift in shifts_today]
-                            # Enforce: sum in allowed_sums
+                        for allowed_set in allowed_sets_today:
+                            allowed_patterns += [set(s) for i in range(2, len(allowed_set)+1) for s in itertools.combinations(allowed_set, i)]
+                        # Forbid all other multi-shift combinations
+                        forbidden = [s for s in all_multi if s not in allowed_patterns]
+                        for forbidden_set in forbidden:
                             self.model.constraints.add(
-                                sum(assigned_vars) <= max(allowed_sums)
+                                sum(self.model.works[worker.id, week, day, shift] for shift in forbidden_set)
+                                <= len(forbidden_set) - 1
                             )
-                            self.model.constraints.add(
+                        # Still, at most all shifts per day
-                                sum(assigned_vars) >= min(allowed_sums)
-                            )
-                            # Now, for each allowed set, prevent partial assignment of the set
-                            for allowed_set in allowed_sets_today:
-                                # If any shift in allowed_set is assigned, all must be assigned
-                                for shift in allowed_set:
-                                    self.model.constraints.add(
-                                        sum(self.model.works[worker.id, week, day, s] for s in allowed_set)
-                                        >= len(allowed_set) * self.model.works[worker.id, week, day, shift]
-                                    )
-                                # No other shifts can be assigned together with the allowed set
-                                for shift in shifts_today:
-                                    if shift not in allowed_set:
-                                        self.model.constraints.add(
-                                            sum(self.model.works[worker.id, week, day, s] for s in allowed_set)
-                                            + self.model.works[worker.id, week, day, shift]
-                                            <= len(allowed_set)
-                                        )
-                                    
-
-                    # Otherwise only one shift per day
-                    else:
                         self.model.constraints.add(
-                            1
+                            sum(self.model.works[worker.id, week, day, shift] for shift in shifts_today)
-                            >= sum(
+                            <= len(shifts_today)
-                                self.model.works[worker.id, week, day, shift]
-                                for shift in self.get_shift_names_by_week_day(week, day)
-                            )
                         )
+                    else:
+                        # Only one shift per day if no allowed sets
+                        self.model.constraints.add(
+                            sum(assigned_vars) <= 1
+                        )
+
                     # This applies to locums as well
                     if self.get_workers_who_require_locums():
                         self.model.constraints.add(
@@ -2647,6 +2661,14 @@ class RotaBuilder(object):
         # Define an objective function with model as input, to pass later
         def obj_rule(m):
             # c = len(workers)
+            prefer_multi_shift_expr = sum(
+                getattr(worker, "prefer_multi_shift_together", 0) *
+                self.model.multi_shift_together[worker.id, week, day, idx]
+                for worker in self.workers
+                for week, day in self.get_week_day_combinations()
+                for idx, allowed_set in enumerate(getattr(worker, "allowed_multi_shift_sets", []))
+                if allowed_set.issubset(self.get_shift_names_by_week_day(week, day))
+            )
 
             balance_modifier_constant = 10
             balance_quadratic_shift_modifier_constant = 3
@@ -2840,16 +2862,17 @@ class RotaBuilder(object):
                 - work_requests
                 + locum_shift_balancing
                 + true_quadratic_shift_balancing
+                - prefer_multi_shift_expr
             )
 
         # add objective function to the model. rule (pass function) or expr (pass expression directly)
         self.model.obj = Objective(rule=obj_rule, sense=minimize)
 
-    def allow_shifts_together(self, *shift_names: str):
+    #def allow_shifts_together(self, *shift_names: str):
-        """
+    #    """
-        Allow the given set of shift names to be assigned together on a single day.
+    #    Allow the given set of shift names to be assigned together on a single day.
-        """
+    #    """
-        self.allowed_multi_shift_sets.append(set(shift_names))
+    #    self.allowed_multi_shift_sets.append(set(shift_names))
 
     def add_warning(self, warning_type: str, message: str):
         print(f"[bold red]WARNING:[/bold red] {warning_type} - {message}")
@@ -3032,6 +3055,13 @@ class RotaBuilder(object):
         for n in range(int((end_date - start_date).days) + 1):
             yield start_date + datetime.timedelta(n)
 
+    def allow_shifts_together_for_all_workers(self, *shift_names: str):
+        """
+        Allow the given set of shift names to be assigned together on a single day for all workers.
+        """
+        for worker in self.workers:
+            worker.allowed_multi_shift_sets.append(frozenset(shift_names))
+
     def build_shifts(self):
         """
         Process the added shifts
@@ -3151,6 +3181,16 @@ class RotaBuilder(object):
         for shift in self.get_shifts_with_constraint("post"):
             self.max_post = max(shift.constraint_options["post"], self.max_post)
 
+        # --- Check allowed_multi_shift_sets validity ---
+        all_shift_names = set(s.name for s in self.shifts)
+        for worker in self.workers:
+            for allowed_set in getattr(worker, "allowed_multi_shift_sets", []):
+                missing = set(allowed_set) - all_shift_names
+                if missing:
+                    raise InvalidShift(
+                        f"Worker '{worker.name}' has allowed_multi_shift_set(s) with non-existent shift(s): {missing}"
+                    )
+
         ## For paired shifts we create proxy shifts
         # self.paired_shift_map = {}
         # for shifts in self.paired_shifts:
@@ -3414,6 +3454,18 @@ class RotaBuilder(object):
 
         return group_workers
 
+    def get_workers_by_site(self, site: str) -> list[Worker]:
+        """
+        Returns a list of workers assigned to a specific site.
+
+        Args:
+            site (str): The site name.
+
+        Returns:
+            list[Worker]: List of workers at the given site.
+        """
+        return [worker for worker in self.workers if worker.site == site]
+
     def get_workers_by_grade(self) -> Dict[int, list[Worker]]:
         group_workers: dict[int, list[Worker]] = defaultdict(list)
         for worker in self.workers:
@@ -3466,7 +3518,7 @@ class RotaBuilder(object):
 
     # RESULTS
     def export_rota_to_html(
-        self, filename: str = "rota", folder=None, timestamp_filename=True
+        self, filename: str = "rota", folder=None, timestamp_filename=False
     ):
         if timestamp_filename:
             filename = f"{filename}_{datetime.datetime.now().strftime('%Y%m%d-%H%M%S')}"
@@ -3562,15 +3614,15 @@ class RotaBuilder(object):
             shifts = []
             w = [f"{worker.name:20}"]
             for week, day in self.get_week_day_combinations():
-                a = "-"
+                shift_display_char = "-"
                 shift_names = []
                 for shift in self.get_shift_names_by_week_day(week, day):
                     if model.works[worker.id, week, day, shift].value > 0.5:
                         shift_names.append(self.get_shift_by_name(shift).get_display_char())
                 if shift_names:
-                    a = "".join(shift_names)
+                    shift_display_char = "".join(shift_names)
                     shifts.extend(shift_names)
-                w.append(a)
+                w.append(shift_display_char)
             shift_count = ""
             for s in set(shifts):
                 shift_count = shift_count + f"{s}: {shifts.count(s)}, "
@@ -3676,7 +3728,7 @@ class RotaBuilder(object):
             for week, day in self.get_week_day_combinations():
                 d = self.start_date + datetime.timedelta(n)
                 n = n + 1
-                a = "-"
+                shift_display_char = "-"
                 shift_names = []
                 assigned_shift_names = []
                 locum = False
@@ -3693,7 +3745,7 @@ class RotaBuilder(object):
                             assigned_shift_names.append(shift)
                             locum = True
                 if shift_names:
-                    a = "<br/>".join(shift_names)
+                    shift_display_char = "<br/>".join(["<span class='multi-shift-shift'>"+name+"</span>" for name in shift_names])
                     shifts.extend(assigned_shift_names)
                     shift_name = assigned_shift_names[0] if assigned_shift_names else ""
 
@@ -3704,7 +3756,6 @@ class RotaBuilder(object):
                     css_class += " multi-shift"
                     
                 title = f"{shift_name} ({d})"
-                css_class = day
                 unavailable_reason = ""
                 if model.available[worker.id, week, day] > 0:
                     available = True
@@ -3751,7 +3802,13 @@ class RotaBuilder(object):
                         css_class = " ".join((css_class, "night-shift"))
 
                 shift_tds.append(
-                    f"<td title='{','.join(shift_names)} ({d})' class='rota-day {css_class}' data-shift='{','.join(shift_names)}' data-available='{available}' data-unavailable_reason='{unavailable_reason}' data-date='{d}' data-week='{week}' data-day='{day}'{remote_site}{requests}{bank_holiday}>{a}</td>"
+                    f"<td title='{','.join(shift_names)} ({d})' class='rota-day {css_class}'"
+                    f" data-shift='{','.join(assigned_shift_names)}'"
+                    f" data-shift-display='{','.join(shift_names)}'"
+                    f" data-available='{available}'"
+                    f" data-unavailable_reason='{unavailable_reason}'"
+                    f" data-date='{d}' data-week='{week}' data-day='{day}'"
+                    f"{remote_site}{requests}{bank_holiday}>{shift_display_char}</td>"
                 )
 
             shift_count = ""
@@ -3961,7 +4018,7 @@ class RotaBuilder(object):
 
             temp = ""
             for shift in self.get_shift_names_by_week_day(week, day):
-                if self.model.works[worker.id, week, day, shift].value > 0:
+                if self.model.works[worker.id, week, day, shift].value > 0.5:
                     shifts[d] = shift
 
         return shifts
@@ -3994,6 +4051,27 @@ class RotaBuilder(object):
 
         return shifts
 
+    def get_worker_shift_count(self, worker: Worker, shift_name:str) -> int:
+        """Returns the number of shifts of a specific type assigned to a worker."""
+        count = 0
+        for week, day in self.get_week_day_combinations():
+            if shift_name in self.get_shift_names_by_week_day(week, day):
+                if self.model.works[worker.id, week, day, shift_name].value > 0.5:
+                    count += 1
+        return count
+
+    def get_worker_days_worked(self, worker: Worker) -> int:
+        """
+        Returns the number of unique days on which the worker is assigned at least one shift.
+        """
+        days_worked = 0
+        for week, day in self.get_week_day_combinations():
+            for shift in self.get_shift_names_by_week_day(week, day):
+                if self.model.works[worker.id, week, day, shift].value > 0.5:
+                    days_worked += 1
+                    break  # Only count each day once, even if multiple shifts
+        return days_worked
+
     def get_worker_shift_list_string(self, worker: Worker) -> str:
         shifts = self.get_worker_shift_list(worker)
 

rota/workers.py

@@ -111,6 +111,9 @@ class Worker(BaseModel):
     bank_holiday_extra: int = 0
     pair: int | str | None = None
     locum: bool = False
+    allowed_multi_shift_sets: list[set] = []  # or list/set of frozensets
+    prefer_multi_shift_together: int = 0  # Default: no preference
+    # Set to a positive integer to prefer, negative to discourage, 0 for neutral
 
     shift_fte_overrides: dict[str, int] = {} # Need checks to ensure shifts exist
 
@@ -389,3 +392,8 @@ class Worker(BaseModel):
             if shift in self.fte_adj_shifts:
                 return self.fte_adj_shifts[shift]
         return self.fte_adj
+
+    def allow_shifts_together(self, *shifts):
+        if not hasattr(self, "allowed_multi_shift_sets"):
+            self.allowed_multi_shift_sets = []
+        self.allowed_multi_shift_sets.append(frozenset(shifts))

test/test_multiple_shifts_per_day.py

@@ -12,6 +12,50 @@ def basic_rota():
     Rota.add_worker(worker)
     return Rota
 
+@pytest.fixture
+def long_rota():
+    start_date = datetime.date(2022, 4, 4)  # must be a Monday!
+    Rota = RotaBuilder(start_date=start_date, weeks_to_rota=10)
+    worker = Worker(name="worker1", site="site1", grade=1)
+    Rota.add_worker(worker)
+    return Rota
+
+@pytest.fixture
+def cons_rota():
+    start_date = datetime.date(2022, 4, 4)  # must be a Monday!
+    Rota = RotaBuilder(start_date=start_date, weeks_to_rota=10)
+    worker1 = Worker(name="worker1", site="a")
+    worker2 = Worker(name="worker2", site="a")
+    worker3 = Worker(name="worker3", site="a")
+    worker4 = Worker(name="worker4", site="a")
+    worker5 = Worker(name="worker5", site="a")
+    worker6 = Worker(name="worker6", site="a")
+    worker7 = Worker(name="worker7", site="a")
+    worker8 = Worker(name="worker8", site="a")
+    worker9 = Worker(name="worker9", site="a")
+    worker10 = Worker(name="worker10", site="a")
+    worker11 = Worker(name="worker11", site="a")
+
+    worker12 = Worker(name="worker12", site="b")
+    worker13 = Worker(name="worker13", site="b")
+    worker14 = Worker(name="worker14", site="b")
+    worker15 = Worker(name="worker15", site="b")
+    worker16 = Worker(name="worker16", site="b")
+    worker17 = Worker(name="worker17", site="b")
+    worker18 = Worker(name="worker18", site="b")
+    worker19 = Worker(name="worker19", site="b")
+    worker20 = Worker(name="worker20", site="b")
+
+    Rota.add_workers([
+        worker1, worker2, worker3, worker4, worker5,
+        worker6, worker7, worker8, worker9, worker10,
+        worker11, worker12, worker13, worker14, worker15,
+        worker16, worker17, worker18, worker19, worker20
+    ])
+
+    
+    return Rota
+
 def test_single_shift_per_day_default(basic_rota):
     Rota = basic_rota
     Rota.add_shifts(
@@ -21,12 +65,6 @@ def test_single_shift_per_day_default(basic_rota):
     Rota.build_and_solve()
     assert Rota.results.solver.status == "error"
     # Only one shift per day should be assigned
-    for week, day in Rota.get_week_day_combinations():
-        assigned = [
-            shift for shift in Rota.get_shift_names_by_week_day(week, day)
-            if Rota.model.works[Rota.workers[0].id, week, day, shift].value > 0.5
-        ]
-        assert len(assigned) <= 1
 
 def test_allow_two_shifts_per_day(basic_rota):
     Rota = basic_rota
@@ -34,7 +72,8 @@ def test_allow_two_shifts_per_day(basic_rota):
         SingleShift(sites=["site1"], name="a", length=8, days=days[:2], workers_required=1),
         SingleShift(sites=["site1"], name="b", length=8, days=days[:2], workers_required=1),
     )
-    Rota.allow_shifts_together("a", "b")
+    for worker in Rota.workers:
+        worker.allow_shifts_together("a", "b")
     Rota.build_and_solve()
     Rota.export_rota_to_html("test_allow_two_shifts", folder="tests")
     assert Rota.results.solver.status == "ok"
@@ -58,7 +97,8 @@ def test_only_specified_shifts_can_be_double_assigned(basic_rota):
         SingleShift(sites=["site1"], name="b", length=8, days=days[:3], workers_required=1),
         SingleShift(sites=["site1"], name="c", length=8, days=days[:3], workers_required=1),
     )
-    Rota.allow_shifts_together("a", "b")
+    for worker in Rota.workers:
+        worker.allow_shifts_together("a", "b")
     Rota.build_and_solve()
     Rota.export_rota_to_html("test_only_specified_shifts_can_be_double_assigned", folder="tests")
     assert Rota.results.solver.status == "ok"
@@ -79,8 +119,111 @@ def test_triple_shifts_allowed(basic_rota):
         SingleShift(sites=["site1"], name="b", length=8, days=days[2:4], workers_required=1),
         SingleShift(sites=["site1"], name="c", length=8, days=days[2:4], workers_required=1),
     )
-    Rota.allow_shifts_together("a", "b", "c")
+    Rota.allow_shifts_together_for_all_workers("a", "b", "c")
     Rota.build_and_solve()
     Rota.export_rota_to_html("test_triple_shifts_allowed", folder="tests")
     assert Rota.results.solver.status == "ok"
 
+def test_triple_shifts_allowed2(long_rota):
+    Rota = long_rota
+    worker2 = Worker(name="worker2", site="site1", grade=1)
+    worker3 = Worker(name="worker3", site="site1", grade=1)
+    Rota.add_worker(worker2)
+    Rota.add_worker(worker3)
+    Rota.add_shifts(
+        SingleShift(sites=["site1"], name="a", length=8, days=days[2:4], workers_required=1, balance_offset=1),
+        SingleShift(sites=["site1"], name="b", length=8, days=days[2:4], workers_required=1, balance_offset=1),
+        SingleShift(sites=["site1"], name="c", length=8, days=days[2:4], workers_required=1, balance_offset=1),
+    )
+
+    worker2.allow_shifts_together("a", "b", "c")
+    worker2.prefer_multi_shift_together = 10
+    worker3.allow_shifts_together("a", "b", "c")
+    worker3.prefer_multi_shift_together = -10
+
+    Rota.build_and_solve()
+    Rota.export_rota_to_html("test_triple_shifts_allowed2", folder="tests")
+    assert Rota.results.solver.status == "ok"
+
+def test_multi_shift_prefs(long_rota):
+    Rota = long_rota
+    #Rota.constraint_options["max_shifts_per_week"] = 10
+    worker2 = Worker(name="worker2", site="site1", grade=1)
+    worker3 = Worker(name="worker3", site="site1", grade=1)
+    worker4 = Worker(name="worker4", site="site1", grade=1)
+    #worker5 = Worker(name="worker5", site="site1", grade=1)
+    Rota.add_worker(worker2)
+    Rota.add_worker(worker3)
+    Rota.add_worker(worker4)
+    #Rota.add_worker(worker5)
+    Rota.add_worker
+    for worker in Rota.workers:
+        worker.allow_shifts_together("a", "b")
+        worker.prefer_multi_shift_together = 0
+    Rota.add_shifts(
+        SingleShift(sites=["site1"], name="a", length=8, days=days[:1], workers_required=1),
+        SingleShift(sites=["site1"], name="b", length=8, days=days[:1], workers_required=1),
+        SingleShift(sites=["site1"], name="c", length=8, days=days[:1], workers_required=1),
+        SingleShift(sites=["site1"], name="d", length=8, days=days[:1], workers_required=1),
+        SingleShift(sites=["site1"], name="e", length=8, days=days[:1], workers_required=1),
+        #SingleShift(sites=["site1"], name="d", length=8, days=days[:1], workers_required=1),
+    )
+    Rota.build_and_solve(options={"ratio": 0})
+    Rota.export_rota_to_html("test_multi_shift_prefs", folder="tests")
+    assert Rota.results.solver.status == "ok"
+
+def test_cons_rota(cons_rota):
+    Rota = cons_rota
+    Rota.add_shifts(
+        SingleShift(sites=["a"], name="oncall", length=8, days=days[:5], workers_required=1),
+        SingleShift(sites=["a", "b"], name="evening", length=8, days=days[:5], workers_required=1),
+    )
+    print("Adding shifts")
+    for worker in Rota.get_workers_by_site("a"):
+        print(worker.name)
+        worker.allow_shifts_together("oncall", "evening")
+        worker.prefer_multi_shift_together = 1
+    Rota.build_and_solve()
+    Rota.export_rota_to_html("test_cons_rota", folder="tests")
+    assert Rota.results.solver.status == "ok"
+
+    # Check that everyone at site "a" is assigned 2 or 3 evening shifts
+    for worker in Rota.get_workers_by_site("a"):
+        evening_count = Rota.get_worker_shift_count(worker, "evening")
+        assert 2 <= evening_count <= 3, f"{worker.name} assigned {evening_count} evening shifts"
+
+        if worker.site == "a":
+            oncall_count = Rota.get_worker_shift_count(worker, "oncall")
+            assert oncall_count == 4 or oncall_count == 5, f"{worker.name} assigned {oncall_count} oncall shifts"
+
+        # Check that days worked is no more than oncall count
+        days_worked = Rota.get_worker_days_worked(worker)
+        assert days_worked <= oncall_count, f"{worker.name} worked {days_worked} days, more than oncall shifts {oncall_count}"
+
+def test_cons_rota2(cons_rota):
+    Rota = cons_rota
+    Rota.add_shifts(
+        SingleShift(sites=["a"], name="oncall", length=8, days=days[:5], workers_required=1),
+        SingleShift(sites=["a", "b"], name="evening", length=8, days=days[:5], workers_required=1),
+    )
+    print("Adding shifts")
+    for worker in Rota.get_workers_by_site("a"):
+        print(worker.name)
+        worker.allow_shifts_together("oncall", "evening")
+        worker.prefer_multi_shift_together = -1
+    Rota.build_and_solve()
+    Rota.export_rota_to_html("test_cons_rota", folder="tests")
+    assert Rota.results.solver.status == "ok"
+
+    # Check that everyone at site "a" is assigned 2 or 3 evening shifts
+    for worker in Rota.get_workers_by_site("a"):
+        evening_count = Rota.get_worker_shift_count(worker, "evening")
+        assert 2 <= evening_count <= 3, f"{worker.name} assigned {evening_count} evening shifts"
+
+        if worker.site == "a":
+            oncall_count = Rota.get_worker_shift_count(worker, "oncall")
+            assert oncall_count == 4 or oncall_count == 5, f"{worker.name} assigned {oncall_count} oncall shifts"
+
+        # Check that days worked is now more than oncall count
+        days_worked = Rota.get_worker_days_worked(worker)
+        assert days_worked > oncall_count, f"{worker.name} worked {days_worked} days, more than oncall shifts {oncall_count}"