[TYPO3-mvc] Extensionbuilder relation question

[Jan Kornblum]

Hi again,

hmm, nobody out there who knows a little bit more about this than me?

I've just recognized the following:

a) when i create a model "category" which has a relation (1:n) to a 
model "product", in ext_tables.sql there is a field (int(11)...) in 
both tables for the opposite side / model.

b) when i create a model "product" which has a relation (n:1) to the 
model "category", in ext_tables.sql there is a field (int(11)...) only 
on "product" table's side.

Can anybody explain this different behaviour on sql-side to me?


Having placed the relation on "product" side, like described in b), i 
am able to access $product->getCategory(). But i must also be able to 
access $category->getProducts() and i tried to accomplish this by doing 
the following:

1. Adding the missing "int(11) not null default 0" field to 
"tx_domain_model_category"

2. Adding $this->products, SetProducts(), GetProducts(), AddProduct(), 
RemoveProduct() methods in the CategoryModel.php

3. Adding a field (config->type = passthrough) to the "Category"-TCA

This should be all necessary steps to get the relation work in the 
opposite direction, but it isn't... Can anybody give me a hint about 
what is missing or wrong?

I think it has something to do with my TCA: When i vardump all 
$categories, each category has a property "products", its type seems to 
be correct, but it is always null / empty. I've recognized that when 
the additional TCA field "products" inside the TCA of "Category" is 
changed to "inline" instead of "passthrough", and Product-records are 
created inside the category-record using the IRRE form, they can be 
accessed by $category->getProducts() correctly. But when i just create 
a "Product" record and choose a "Category" by the selectbox, this 
Product cannot be accessed by $category->getProducts()...

Kind regards, Jan