Orchard Custom Workflow Activity - orchardcms

Question

I have built a custom module in Orchard that creates a new part, type and a custom activity but I'm struggling with the last part of what I need to do which is to create a copy of all the content items associated with a specific parent item.
For instance, when someone creates a "Trade Show" (new type from my module), various subpages can be created off of it (directions, vendor maps, etc.) since the client runs a single show at a time. What I need to do is, when they create a new Trade Show, I want to get the most recent prior show (which I'm doing via _contentManager.HqlQuery().ForType("TradeShow").ForVersion(VersionOptions.Latest).ForVersion(VersionOptions.Published).List().Last() (positive that's not the most efficient way, but it works and the record count would be ~10 after five years), then find all of those child pages that correlate to that old show and copy them into new Content Items. They have to be a copy because on occasion they may have to refer back to parts with the old shows, or it could change, etc. All the usual reasons.
How do I go about finding all of the content items that reference that prior show in an Activity? Here is my full class for the Activity:
using System;
using System.Collections.Generic;
using System.Linq;
using Orchard.Autoroute.Services;
using Orchard.ContentManagement;
using Orchard.Localization;
using Orchard.Projections.Models;
using Orchard.Projections.Services;
using Orchard.Workflows.Models;
using Orchard.Workflows.Services;
using Orchard.Workflows.Activities;
namespace Orchard.Web.Modules.TradeShows.Activities
{
public class TradeShowPublishedActivity : Task
{
private readonly IContentManager _contentManager;
private readonly IAutorouteService _autorouteService;
private readonly IProjectionManager _projectionManager;
public TradeShowPublishedActivity(IContentManager contentManager, IAutorouteService autorouteService, IProjectionManager projectionManager)
{
_contentManager = contentManager;
_autorouteService = autorouteService;
_projectionManager = projectionManager;
T = NullLocalizer.Instance;
}
public Localizer T { get; set; }
public override LocalizedString Category
{
get { return T("Flow"); }
}
public override LocalizedString Description
{
get { return T("Handles the automatic creation of content pages for the new show."); }
}
public override string Name
{
get { return "TradeShowPublished"; }
}
public override string Form
{
get { return null; }
}
public override IEnumerable<LocalizedString> GetPossibleOutcomes(WorkflowContext workflowContext, ActivityContext activityContext)
{
yield return T("Done");
}
public override IEnumerable<LocalizedString> Execute(WorkflowContext workflowContext, ActivityContext activityContext)
{
var priorShow = _contentManager.HqlQuery().ForType("TradeShow").ForVersion(VersionOptions.Latest).ForVersion(VersionOptions.Published).List().Last();
var tradeShowPart = priorShow.Parts.Where(p => p.PartDefinition.Name == "TradeShowContentPart").Single();
//new show alias
//workflowContext.Content.ContentItem.As<Orchard.Autoroute.Models.AutoroutePart>().DisplayAlias
yield return T("Done");
}
}
}
My Migrations.cs file sets up the part that is used for child pages to reference the parent show like this:
ContentDefinitionManager.AlterPartDefinition("AssociatedTradeShowPart", builder => builder.WithField("Trade Show", cfg => cfg.OfType("ContentPickerField")
.WithDisplayName("Trade Show")
.WithSetting("ContentPickerFieldSettings.Attachable", "true")
.WithSetting("ContentPickerFieldSettings.Description", "Select the trade show this item is for.")
.WithSetting("ContentPickerFieldSettings.Required", "true")
.WithSetting("ContentPickerFieldSettings.DisplayedContentTypes", "TradeShow")
.WithSetting("ContentPickerFieldSettings.Multiple", "false")
.WithSetting("ContentPickerFieldSettings.ShowContentTab", "true")));
Then, my child pages (only one for now, but plenty more coming) are created like this:
ContentDefinitionManager.AlterTypeDefinition("ShowDirections", cfg => cfg.DisplayedAs("Show Directions")
.WithPart("AutoroutePart", builder => builder.WithSetting("AutorouteSettings.AllowCustomPattern", "true")
.WithSetting("AutorouteSettings.AutomaticAdjustmentOnEdit", "false")
.WithSetting("AutorouteSettings.PatternDefinitions", "[{Name:'Title', Pattern: '{Content.Slug}', Description: 'international-trade-show'}]")
.WithSetting("AutorouteSettings.DefaultPatternIndex", "0"))
.WithPart("CommonPart", builder => builder.WithSetting("DateEditorSettings.ShowDateEditor", "false"))
.WithPart("PublishLaterPart")
.WithPart("TitlePart")
.WithPart("AssociatedTradeShowPart") /* allows linking to parent show */
.WithPart("ContainablePart", builder => builder.WithSetting("ContainablePartSettings.ShowContainerPicker", "true"))
.WithPart("BodyPart"));

Answer 1

So you have the Trade Show content item, the next step will be to find all parts with a ContentPickerField, then filter that list down to those where the field contains your show's ID.
var items = _contentManager.Query().List().ToList() // Select all content items
.Select(p => (p.Parts
// Select all parts on content items
.Where(f => f.Fields.Where(d =>
d.FieldDefinition.Name == typeof(ContentPickerField).Name &&
// See if any of the fields are ContentPickerFields
(d as ContentPickerField).Ids.ToList().Contains(priorShow.Id)).Any())));
// That field contains the Id of the show
This could get expensive depending on how many content items are in your database.