Add color family filter to inventory index

Adds an 'All Colors' dropdown to the inventory filter bar populated from
the ColorFamilies values already stored on inventory items. Selecting a
family (e.g. 'Red') returns only items tagged with that family.

Also refactors the 16-branch if/else filter builder into a single
composable predicate, making future filter additions trivial.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/InventoryController.cs

@@ -56,15 +56,16 @@ public class InventoryController : Controller
 
     /// <summary>
     /// Displays the paginated inventory list with optional keyword search, category filter,
-    /// and a low-stock quick-filter. When lowStockOnly is active the default sort switches
+    /// color family filter, and a low-stock quick-filter. When lowStockOnly is active the
-    /// to QuantityOnHand ascending so the most depleted items surface immediately. Stats
+    /// default sort switches to QuantityOnHand ascending so the most depleted items surface
-    /// (total value, active count, low-stock count) are computed directly on the DbSet
+    /// immediately. Stats (total value, active count, low-stock count) are computed directly
-    /// using aggregate SQL to avoid loading all rows into memory.
+    /// on the DbSet using aggregate SQL to avoid loading all rows into memory.
     /// </summary>
     public async Task<IActionResult> Index(
         string? searchTerm,
         string? category,
         string? location,
+        string? colorFamily,
         string? sortColumn,
         string sortDirection = "asc",
         bool lowStockOnly = false,
@@ -88,64 +89,35 @@ public class InventoryController : Controller
             };
             gridRequest.Validate();
 
-            // Build filter — compose search, category, location, and low-stock predicates
-            System.Linq.Expressions.Expression<Func<InventoryItem, bool>>? filter = null;
-
             var hasSearch      = !string.IsNullOrWhiteSpace(searchTerm);
             var hasCategory    = !string.IsNullOrWhiteSpace(category);
             var hasLocation    = !string.IsNullOrWhiteSpace(location);
+            var hasColorFamily = !string.IsNullOrWhiteSpace(colorFamily);
 
             var search   = searchTerm?.ToLower() ?? "";
             var cat      = category ?? "";
             var loc      = location ?? "";
+            var colorFam = colorFamily ?? "";
 
-            if (lowStockOnly && hasSearch && hasLocation)
+            // Single composable predicate — EF Core evaluates the captured booleans as constants
-                filter = i => i.IsActive && i.QuantityOnHand <= i.ReorderPoint
+            // so inactive conditions fold to true and are omitted from the generated SQL WHERE clause.
-                    && (i.Location != null && i.Location.ToLower() == loc.ToLower())
+            System.Linq.Expressions.Expression<Func<InventoryItem, bool>>? filter = null;
-                    && (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
+            if (hasSearch || hasCategory || hasLocation || hasColorFamily || lowStockOnly)
-                        || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
+            {
-                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)));
+                filter = i =>
-            else if (lowStockOnly && hasSearch)
+                    (!lowStockOnly || (i.IsActive && i.QuantityOnHand <= i.ReorderPoint)) &&
-                filter = i => i.IsActive && i.QuantityOnHand <= i.ReorderPoint
+                    (!hasSearch || (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
-                    && (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
-                        || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
-                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)));
-            else if (lowStockOnly && hasLocation)
-                filter = i => i.IsActive && i.QuantityOnHand <= i.ReorderPoint
-                    && (i.Location != null && i.Location.ToLower() == loc.ToLower());
-            else if (lowStockOnly)
-                filter = i => i.IsActive && i.QuantityOnHand <= i.ReorderPoint;
-            else if (hasSearch && hasCategory && hasLocation)
-                filter = i => (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
                         || (i.Description != null && i.Description.ToLower().Contains(search))
                         || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
-                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)))
+                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)))) &&
-                    && i.Category.ToLower() == cat.ToLower()
+                    (!hasCategory || i.Category.ToLower() == cat.ToLower()) &&
-                    && (i.Location != null && i.Location.ToLower() == loc.ToLower());
+                    (!hasLocation || (i.Location != null && i.Location.ToLower() == loc.ToLower())) &&
-            else if (hasSearch && hasCategory)
+                    (!hasColorFamily || (i.ColorFamilies != null && (
-                filter = i => (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
+                        i.ColorFamilies == colorFam ||
-                        || (i.Description != null && i.Description.ToLower().Contains(search))
+                        i.ColorFamilies.StartsWith(colorFam + ",") ||
-                        || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
+                        i.ColorFamilies.EndsWith("," + colorFam) ||
-                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)))
+                        i.ColorFamilies.Contains("," + colorFam + ","))));
-                    && i.Category.ToLower() == cat.ToLower();
+            }
-            else if (hasSearch && hasLocation)
-                filter = i => (i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
-                        || (i.Description != null && i.Description.ToLower().Contains(search))
-                        || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
-                        || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search)))
-                    && (i.Location != null && i.Location.ToLower() == loc.ToLower());
-            else if (hasSearch)
-                filter = i => i.SKU.ToLower().Contains(search) || i.Name.ToLower().Contains(search)
-                    || (i.Description != null && i.Description.ToLower().Contains(search))
-                    || (i.ColorName != null && i.ColorName.ToLower().Contains(search))
-                    || (i.Manufacturer != null && i.Manufacturer.ToLower().Contains(search));
-            else if (hasCategory && hasLocation)
-                filter = i => i.Category.ToLower() == cat.ToLower()
-                    && (i.Location != null && i.Location.ToLower() == loc.ToLower());
-            else if (hasCategory)
-                filter = i => i.Category.ToLower() == cat.ToLower();
-            else if (hasLocation)
-                filter = i => i.Location != null && i.Location.ToLower() == loc.ToLower();
 
             // Build orderBy function
             Func<IQueryable<InventoryItem>, IOrderedQueryable<InventoryItem>> orderBy = gridRequest.SortColumn switch
@@ -179,6 +151,14 @@ public class InventoryController : Controller
             var allItems = (await _unitOfWork.InventoryItems.FindAsync(i => i.CompanyId == companyId)).ToList();
             ViewBag.Categories         = allItems.Select(i => i.Category).Where(c => c != null).Distinct().OrderBy(c => c).ToList();
             ViewBag.Locations          = allItems.Select(i => i.Location).Where(l => !string.IsNullOrWhiteSpace(l)).Distinct().OrderBy(l => l).ToList();
+            ViewBag.ColorFamilies      = allItems
+                .Where(i => !string.IsNullOrEmpty(i.ColorFamilies))
+                .SelectMany(i => i.ColorFamilies!.Split(',', StringSplitOptions.RemoveEmptyEntries))
+                .Select(f => f.Trim())
+                .Where(f => f.Length > 0)
+                .Distinct()
+                .OrderBy(f => f)
+                .ToList();
             ViewBag.StatsLowStockCount = allItems.Count(i => i.IsActive && i.QuantityOnHand <= i.ReorderPoint);
             ViewBag.StatsActiveCount   = allItems.Count(i => i.IsActive);
             ViewBag.StatsTotalValue    = allItems.Sum(i => (decimal?)i.QuantityOnHand * i.UnitCost) ?? 0m;
@@ -187,6 +167,7 @@ public class InventoryController : Controller
             ViewBag.SearchTerm   = searchTerm;
             ViewBag.Category     = category;
             ViewBag.Location     = location;
+            ViewBag.ColorFamily  = colorFamily;
             ViewBag.LowStockOnly = lowStockOnly;
             ViewBag.SortColumn   = gridRequest.SortColumn;
             ViewBag.SortDirection = gridRequest.SortDirection;

src/PowderCoating.Web/Views/Inventory/Index.cshtml

@@ -124,8 +124,9 @@
 @{
     var lowStockOnly = (bool)(ViewBag.LowStockOnly ?? false);
     var activeLocation = ViewBag.Location as string;
+    var activeColorFamily = ViewBag.ColorFamily as string;
 }
-@if (!string.IsNullOrEmpty(ViewBag.SearchTerm) || !string.IsNullOrEmpty(ViewBag.Category) || !string.IsNullOrEmpty(activeLocation) || lowStockOnly)
+@if (!string.IsNullOrEmpty(ViewBag.SearchTerm) || !string.IsNullOrEmpty(ViewBag.Category) || !string.IsNullOrEmpty(activeLocation) || !string.IsNullOrEmpty(activeColorFamily) || lowStockOnly)
 {
     <div class="alert @(lowStockOnly ? "alert-warning" : "alert-info") alert-permanent d-flex justify-content-between align-items-center flex-wrap gap-2">
         <div>
@@ -149,6 +150,10 @@
                 {
                     <span> in bin "<strong>@activeLocation</strong>"</span>
                 }
+                @if (!string.IsNullOrEmpty(activeColorFamily))
+                {
+                    <span> in color family "<strong>@activeColorFamily</strong>"</span>
+                }
             }
         </div>
         <div class="d-flex gap-2 flex-wrap">
@@ -182,6 +187,16 @@
                             <option value="@cat" selected="@(cat == ViewBag.Category)">@cat</option>
                         }
                     </select>
+                    @if (((IEnumerable<string>)ViewBag.ColorFamilies).Any())
+                    {
+                        <select name="colorFamily" class="form-select" style="max-width: 160px; min-width: 120px;" onchange="this.form.submit()">
+                            <option value="">All Colors</option>
+                            @foreach (var family in ViewBag.ColorFamilies)
+                            {
+                                <option value="@family" selected="@(family == activeColorFamily)">@family</option>
+                            }
+                        </select>
+                    }
                     @if (((IEnumerable<string?>)ViewBag.Locations).Any())
                     {
                         <select name="location" class="form-select" style="max-width: 180px; min-width: 130px;" onchange="this.form.submit()">
@@ -215,7 +230,7 @@
     <div class="card-body p-0">
         @if (!Model.Items.Any())
         {
-            var isInventoryFiltered = !string.IsNullOrEmpty(ViewBag.SearchTerm as string) || !string.IsNullOrEmpty(ViewBag.Category as string) || lowStockOnly;
+            var isInventoryFiltered = !string.IsNullOrEmpty(ViewBag.SearchTerm as string) || !string.IsNullOrEmpty(ViewBag.Category as string) || !string.IsNullOrEmpty(activeColorFamily) || lowStockOnly;
             <div class="text-center py-5">
                 <i class="bi bi-inbox" style="font-size: 4rem; color: #d1d5db;"></i>
                 <h5 class="mt-3 text-muted">No inventory items found</h5>