Page MenuHomeSealhub
Files F995424

deep-reverse-single-reference.remarkup
No OneTemporary
Actions

deep-reverse-single-reference.remarkup
View Options

Deep Reverse Single Reference

This field will store a list of ids of a collection referenced in an
intermediary collection, often used for n-to-n relations.

Say you have collections like so:

articles: new (class extends Collection {
    fields = {
        title: new Text(),
    };
})(),

categories: new (class extends Collection {
    fields = {
        name: new Text(),
    };
})(),

article_category: new (class extends Collection {
    fields = {
        article: new SingleReference("articles"),
        category: new SingleReference("categories"),
    };
})(),

The article_category collection connects articles and categories in a way
that lets you have every connection assigned to any amount of articles, and any
article to any amount of categories (n-to-n).

Now, we can add a field to articles that will list the ids of categories
assigned to that article:

articles: new (class extends Collection {
    fields = {
        title: new Text(),
        categories: new DeepReverseSingleReference({
            intermediary_collection: "article_category",
            intermediary_field_that_points_here:
                "article",
            intermediary_field_that_points_there:
                "category",
            target_collection: "categories",
        }),
    };
})(),

Now, when you add a category-article binding to the article_category
collection, the categories field in articles will automatically update and
contain a list of all categories that are assigned to the articles.

Constructor params

Assuming you have A and B collections with n-to-n relation:

// .. in collection A 

new DeepReverseSingleReference({
    intermediary_collection: "a_to_b", // the collection that stores the links between colllection A and B
    intermediary_field_that_points_here: "a", // which field in intermediary collection points to collection A 
    intermediary_field_that_points_there: "b", // which field in intermediary collection points to collection b
    target_collection: "b", // the target collection
}),

File Metadata

Mime Type
text/plain
Expires
Mon, Dec 23, 04:10 (17 h, 56 m)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
556811
Default Alt Text
deep-reverse-single-reference.remarkup (2 KB)

Event Timeline