In Orchard, how is a module developer able to learn how "joins" work, particularly when joining to core parts and records? One of the better helps I've seen was in Orchard documentation, but none of those examples show how to form relations with existing or core parts. As an example of something I'm looking for, here is a snippet of module service code taken from a working example:
_contentManager
.Query<TaxonomyPart>()
.Join<RoutePartRecord>()
.Where(r => r.Title == name)
.List()
In this case, a custom TaxonomyPart
is joining with a core RoutePartRecord
. I've investigated the code, and I can't see how that a TaxononmyPart is "joinable" to a RoutePartRecord. Likewise, from working code, here is another snippet driver code which relates a custom TagsPart with a core CommonPartRecord:
List<string> tags = new List<string> { "hello", "there" };
IContentQuery<TagsPart, TagsPartRecord> query = _cms.Query<TagsPart, TagsPartRecord>();
query.Where(tpr => tpr.Tags.Any(t => tags.Contains(t.TagRecord.TagName)));
IEnumerable<TagsPart> parts =
query.Join<CommonPartRecord>()
.Where(cpr => cpr.Id != currentItemId)
.OrderByDescending(cpr => cpr.PublishedUtc)
.Slice(part.MaxItems);
I thought I could learn from either of the prior examples of how to form my own query. I did this:
List<string> tags = new List<string> { "hello", "there" };
IContentQuery<TagsPart, TagsPartRecord> query = _cms.Query<TagsPart, TagsPartRecord>();
query.Where(tpr => tpr.Tags.Any(t => tags.Contains(t.TagRecord.TagName)));
var stuff =
query.Join<ContainerPartRecord>()
.Where(ctrPartRecord => ctrPartRecord.ContentItemRecord.ContentType.Name == "Primary")
.List();
The intent of my code is to limit the content items found to only those of a particular container (or blog). When the code ran, it threw an exception on my join query saying {"could not resolve property: ContentType of: Orchard.Core.Containers.Models.ContainerPartRecord"}
. This leads to a variety of questions:
CommonPartRecord
populated, but not the ContainerPartRecord
? In general how would I know what part records are populated, and when?models
classes, and found no inherent relation between a TagsPart and a CommonPartRecord. Thus, besides looking at that sample code, how would anyone have known in the first place that such a join was legal or possible? TagsPart
and ContainerPartRecord
legal in any context? Which?It seems there is a hole in the documentation regarding these kinds of thoughts and questions, which makes it hard to write a module. Whatever answers can be found for this topic, I'd be glad to compile into an article or community Orchard documentation.
As for holes in the documentation, well, but of course. The documentation that we have today is only covering a very small part of the platform. Your best reference today is the source code. Any contribution you could make to this is highly appreciated by us and by the rest of the community. Let me know if you need help with this.
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