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Error executing template "Designs/Swift/Paragraph/Swift_ProductComponentSlider.cshtml"
System.NullReferenceException: Object reference not set to an instance of an object.
   at Dynamicweb.Ecommerce.ProductCatalog.ViewEngine.<>c__DisplayClass6_0.<GetRelatedGroups>b__1(IGrouping`2 group)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
   at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at System.Lazy`1.CreateValue()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Lazy`1.get_Value()
   at CompiledRazorTemplates.Dynamic.RazorEngine_4fc2942861804661bd3e207fc709298c.Execute() in D:\dynamicweb.net\Solutions\smartpage\vmelektro.cloud.dynamicweb-cms.com\Files\Templates\Designs\Swift\Paragraph\Swift_ProductComponentSlider.cshtml:line 117
   at RazorEngine.Templating.TemplateBase.RazorEngine.Templating.ITemplate.Run(ExecuteContext context, TextWriter reader)
   at RazorEngine.Templating.RazorEngineService.RunCompile(ITemplateKey key, TextWriter writer, Type modelType, Object model, DynamicViewBag viewBag)
   at RazorEngine.Templating.RazorEngineServiceExtensions.<>c__DisplayClass16_0.<RunCompile>b__0(TextWriter writer)
   at RazorEngine.Templating.RazorEngineServiceExtensions.WithWriter(Action`1 withWriter)
   at Dynamicweb.Rendering.RazorTemplateRenderingProvider.Render(Template template)
   at Dynamicweb.Rendering.TemplateRenderingService.Render(Template template)
   at Dynamicweb.Rendering.Template.RenderRazorTemplate()


  1     @inherits Dynamicweb.Rendering.ViewModelTemplate<Dynamicweb.Frontend.ParagraphViewModel>
  2     @using Dynamicweb.Core
  3     @using Dynamicweb.Ecommerce.ProductCatalog
  4     
  5     @{
  6     	ProductViewModel product = null;
  7     	if (Dynamicweb.Context.Current.Items.Contains("ProductDetails"))
  8     	{
  9     		product = (ProductViewModel)Dynamicweb.Context.Current.Items["ProductDetails"];
 10     	}
 11     	else if (Pageview.Page.Item["DummyProduct"] != null && Pageview.IsVisualEditorMode)
 12     	{
 13     		var pageViewModel = Dynamicweb.Frontend.ContentViewModelFactory.CreatePageInfoViewModel(Pageview.Page);
 14     		ProductListViewModel productList = pageViewModel.Item.GetValue("DummyProduct") != null ? pageViewModel.Item.GetValue("DummyProduct") as ProductListViewModel : new ProductListViewModel();
 15     
 16     		if (productList?.Products is object)
 17     		{
 18     			product = productList.Products[0];
 19     		}
 20     	}
 21     
 22     	string layout = Model.Item.GetRawValueString("Layout") == "slider" ? "ProductSliderComponent" : "ProductGridComponent";
 23     	string lazyHeight = Model.Item.GetBoolean("SetMinHeightForLazyLoading") ? "min-height: 360px" : "";
 24     	string theme = !string.IsNullOrWhiteSpace(Model.Item.GetRawValueString("Theme")) ? " theme " + Model.Item.GetRawValueString("Theme").Replace(" ", "").Trim().ToLower() : "";
 25     
 26     	//Link generation
 27     	string pageId = Model.Item.GetLink("ProductSliderServicePage") != null ? Model.Item.GetLink("ProductSliderServicePage").PageId.ToString() : "";
 28     	string servicePageByNavigationTag = GetPageIdByNavigationTag("ProductSliderService") != 0 ? GetPageIdByNavigationTag("ProductSliderService").ToString() : "";
 29     	pageId = pageId == "" ? servicePageByNavigationTag : pageId;
 30     
 31     	string url = "/Default.aspx?ID=" + pageId;
 32     
 33     	if (Pageview.IsVisualEditorMode)
 34     	{
 35     		url += "&VisualEdit=True";
 36     	}
 37     
 38     	bool isLazyLoadingForProductInfoEnabled = Dynamicweb.Core.Converter.ToBoolean(Dynamicweb.Context.Current.Items["IsLazyLoadingForProductInfoEnabled"]);
 39     	if (isLazyLoadingForProductInfoEnabled)
 40     	{
 41     		url += "&getproductinfo=true";
 42     	}
 43     
 44     	url += $"&ProductListPartial={layout}"; //Use this to render either a slider or a grid
 45     
 46     	//Source type
 47     	string sourceType = Model.Item.GetRawValueString("RelationType", "trending");
 48     	IList<string> relateFromProductIds = new List<string> { };
 49     	IList<string> relateFromProductVariantIds = new List<string> { };
 50     	IList<string> relateFromGroupIds = new List<string> { };
 51     	bool hasVariants = false;
 52     
 53     
 54     	ProductListViewModel relateToViewModel = Model.Item.GetValue<ProductListViewModel>("RelateTo");
 55     
 56     	//--- PRODUCTS ---
 57     	if (sourceType == "variants" || sourceType == "frequently" || sourceType == "selected")
 58     	{
 59     		if (relateToViewModel?.Products != null)
 60     		{
 61     			hasVariants = relateToViewModel.Products.Any(p => !string.IsNullOrEmpty(p.VariantId));
 62     			foreach (var fromProduct in relateToViewModel.Products)
 63     			{
 64     				if (hasVariants)
 65     				{
 66     					if (!string.IsNullOrEmpty(fromProduct.VariantId))
 67     					{
 68     						relateFromProductVariantIds.Add($"{fromProduct.Id} {fromProduct.VariantId}");
 69     					}
 70     					else
 71     					{
 72     						relateFromProductVariantIds.Add($"{fromProduct.Id}");
 73     					}
 74     				}
 75     				relateFromProductIds.Add($"{fromProduct.Id}");
 76     			}
 77     		}
 78     	}
 79     
 80     	//--- GROUPS ---
 81     	if (sourceType == "most-sold" || sourceType == "trending" || sourceType == "latest" || sourceType == "custom")
 82     	{
 83     		var groupsToRelateTo = Model.Item.GetList("RelateTo")?.GetRawValue().OfType<string>().ToList();
 84     
 85     		if (groupsToRelateTo != null) {
 86     			foreach (var fromGroup in groupsToRelateTo)
 87     			{
 88     				var groupId = fromGroup.Length > 2 ? fromGroup.Remove(0, 2) : fromGroup;
 89     
 90     				if (!fromGroup.Contains("p_"))
 91     				{
 92     					relateFromGroupIds.Add(groupId);
 93     				}
 94     			}
 95     		}
 96     
 97     		if (relateToViewModel?.Products != null)
 98     		{
 99     			foreach (var fromProduct in relateToViewModel.Products)
100     			{
101     				var groupId = fromProduct.PrimaryOrDefaultGroup.Id;
102     				relateFromGroupIds.Add(groupId);
103     			}
104     		}
105     	}
106     
107     	string relationGroupId = Model.Item.GetRawValueString("RelationGroup", string.Empty);
108     
109     	//--- RELATED GROUP ---
110     	if (sourceType == "related")
111     	{
112     		if (relateToViewModel?.Products != null)
113     		{
114     			product = relateToViewModel.Products.FirstOrDefault();
115     		}
116     
117     		if (product?.RelatedGroups != null)
118     		{
119     			foreach (var relationGroup in product.RelatedGroups)
120     			{
121     				if (relationGroup.Id == relationGroupId) {
122     					hasVariants = relationGroup.Products.Any(p => !string.IsNullOrEmpty(p.VariantId));
123     					foreach (var fromProduct in relationGroup.Products)
124     					{
125     						if (hasVariants)
126     						{
127     							if (!string.IsNullOrEmpty(fromProduct.VariantId))
128     							{
129     								relateFromProductVariantIds.Add($"{fromProduct.ProductId} {fromProduct.VariantId}");
130     							}
131     							else
132     							{
133     								relateFromProductVariantIds.Add($"{fromProduct.ProductId}");
134     							}
135     						}
136     						relateFromProductIds.Add($"{fromProduct.ProductId}");
137     					}
138     				}
139     			}
140     		}
141     	}
142     
143     
144     	//Create group id collection and products id collection strings
145     	string productIds = relateFromProductIds.Count > 0 ? string.Join(",", relateFromProductIds) : "";
146     	string productVariantIds = relateFromProductVariantIds.Count > 0 ? string.Join(",", relateFromProductVariantIds) : "";
147     	string groupIds = relateFromGroupIds.Count > 0 ? string.Join(",", relateFromGroupIds) : "";
148     
149     	if (product is object)
150     	{
151     		if (string.IsNullOrEmpty(productIds) && (sourceType == "variants" || sourceType == "frequently" || sourceType == "selected" || sourceType == "custom"))
152     		{
153     			productIds = product.Id;
154     		}
155     
156     		if (string.IsNullOrEmpty(groupIds) && (sourceType == "most-sold" || sourceType == "trending" || sourceType == "latest"))
157     		{
158     			groupIds = product.PrimaryOrDefaultGroup.Id;
159     		}
160     	}
161     }
162     
163     @*Container element for the request*@
164     @if (!string.IsNullOrEmpty(productIds) || !string.IsNullOrEmpty(groupIds) || (string.IsNullOrEmpty(productIds) && string.IsNullOrEmpty(groupIds) && sourceType != "related"))
165     {
166     	<form method="post" action="@url" id="ComponentSliderProductsForm_@Model.ID" data-response-target-element="ComponentSliderProducts_@Model.ID" data-preloader="inline" data-update-url="false" class="item_@Model.Item.SystemName.ToLower()">
167     		<input type="hidden" name="ParagraphId" value="@Model.ID" />
168     		<input type="hidden" name="SortOrder" value="DESC">
169     		<input type="hidden" name="SourceType" value="@sourceType">
170     
171     		@if (!string.IsNullOrEmpty(groupIds))
172     		{
173     			<input type="hidden" name="GroupId" value="@groupIds">
174     		}
175     		@if (sourceType != "frequently" && !string.IsNullOrEmpty(productIds) && !hasVariants)
176     		{
177     			<input type="hidden" name="MainProductId" value="@productIds">
178     		}
179     		@if (sourceType != "frequently" && hasVariants)
180     		{
181     			<input type="hidden" name="ProductVariantId" value="@productVariantIds">
182     		}
183     
184     		@if (Model.Item.GetInt32("ProductsCount") != 0)
185     		{
186     			<input type="hidden" name="PageSize" value="@Model.Item.GetInt32("ProductsCount")">
187     		}
188     
189     		@if (sourceType == "variants")
190     		{
191     			<input type="hidden" name="isVariant" value="true">
192     		}
193     		@if (sourceType == "most-sold")
194     		{
195     			<input type="hidden" name="SortBy" value="OrderCount">
196     		}
197     		@if (sourceType == "trending")
198     		{
199     			<input type="hidden" name="SortBy" value="OrderCountGrowth">
200     		}
201     		@if (sourceType == "frequently" && !string.IsNullOrEmpty(productIds))
202     		{
203     			<input type="hidden" name="BoughtWithProductIds" value="[@productIds]">
204     		}
205     		@if (sourceType == "latest")
206     		{
207     			<input type="hidden" name="SortBy" value="Created">
208     		}
209     	</form>
210     
211     	<script type="module" src="/Files/Templates/Designs/Swift/Assets/js/swiffy-slider.js"></script>
212     	<script>
213     		window.addEventListener("load", () => {
214     			swift.AssetLoader.Load('/Files/Templates/Designs/Swift/Assets/css/swiffy-slider.min.css', 'css');
215     		});
216     	</script>
217     
218     	<div class="w-100 h-100@(theme)">
219     		<div id="@Model.ID" class="user-select-none" style="scroll-margin-top:var(--header-height,150px)"></div>
220     		<div id="ComponentSliderProducts_@Model.ID" class="h-100" style="@lazyHeight"></div>
221     	</div>
222     
223     	<script type="module">
224     		const productSliderContainer = document.querySelector("#ComponentSliderProducts_@Model.ID");
225     		const productSliderForm = document.querySelector("#ComponentSliderProductsForm_@Model.ID");
226     
227     		swift.PageUpdater.Update(productSliderForm);
228     		productSliderForm.addEventListener("updated.swift.pageupdater", function(e){
229     			if (e.detail.html === "") {
230     				productSliderContainer.closest("[data-col-size]").classList.add("d-none");
231     			}
232     		});
233     	</script>
234     }
235     else if (Pageview.IsVisualEditorMode == true)
236     {
237     	<div class="alert alert-dark" role="alert">
238     		<span>@Translate("Product component slider: The slider will be rendered here, if there is anything to show")</span>
239     	</div>
240     }
241