Why does it say there is no such method when getting data from a table through relationships?

Question

Laravel

There is a CATEGORIES table that is linked to a SUBCATEGORY (1 to many) table, which in turn is linked to a POSTS (many to many) table.
Question: when I call dd( $category->subcategory->post() ) it says there is no such method post() how do I access all POSTS of this CATEGORY via SUBCATEGORIES?
1) The many-to-many connection through does not work because there can be many subcategories for posts and therefore SUBCATEGORIES are associated with many-to-many POSTs, and for many-to-many connection through the subcategory_id field in the POST is required, but it is not there, respectively))))
2) it is impossible to create a CATEGORY_ID column in POST and immediately search for all posts of this category due to some circumstances :)

Answer 1

Because in $category->subcategorylies Collection? Well, i.e. you can't get post() from a collection, you first need to pull the model from the subcategory.

$subcategories = $category->subcategory;
foreach($subcategories as $subcat) {
    var_dump($subcat->post)
}

Well, or eager loading And then, too, go through the cycle and get the posts. Well, the relationship, probably, should be called in the plural?