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Hi all!

We're in the process of building an epi cms block that does what the title dictates, it gets the latest X comments (optional from comments on a product from a specific category) and displays them in a list.

We're not really sure how to manage this, however. First part is easy, getting the latest comments is just querying all Comments with the composite class Y we're using and sorting by date. The tricky part comes when we want to do it per category. All comments with composite class Y are tightly coupled with variants in episerver, however which categories a variant is included in does not exist in epi social, yet. It would make sense to create a

public List Categories { get; set; }

on the composite Y, since a varaint can be in several categories. Now, since we want to fetch all comments where


but I don't see any way of implementing this logic with the current commentrepository-API.

How can I solve this? It feels like a pretty common use case for comments, to show latest comments/ratings/reviews on a category page.

Feb 02, 2017 14:32

Hi Joel,

The platform doesn't officially offer a "Contains" expression at this time (the feature is currently in the product backlog) but there is an undocumented behavior that may suffice for you until such a feature is implemented.

It so happens that the EqualToExpression, when used against a collection of the supported value types, will behave like a "contains" operation. So, if you apply an extension filter to your criteria (CompositeCriteria<TFilter,TExtension>.ExtensionFilter), which leverages the EqualToExpression against the Categories field, the results will actually be limited to those that contain the desired category.

For example:

var criteria = new CompositeCriteria<CommentFilter, TestData>
    ExtensionFilter = FilterExpressionBuilder<TestData>.Field(td => td.Categories).EqualTo(categoryNameDefinedInBlock)                    

While it's not an officially supported behavior, we have no plans to remove the behavior in the foreseeable future. I think that will acheive what you're looking to do in the near term.

Feb 02, 2017 21:06

Hi Chris,

Well that was a hidden suprise! Haven't tried it out yet, but if what you say is true you should promote this in your documentation! :) Will return with feedback if I get any issues with it.


Joel Yourstone

Feb 07, 2017 6:39

Yes -- it's more of a convenient quirk at this point. It will certainly be documented when we introduce formal support in the form of a "contains" expression in the near future.

Feb 07, 2017 20:51

I think AI is taking over...embarassed Moderators, do your thing!

Feb 13, 2018 11:14

Hi Joel, we have done our thing. ;-)

Feb 13, 2018 11:25
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