UpdateAll strange behaviour

Hi to all,

I'm currently encountering some strange behaviour when I'm using updateAll method.

I'll explain my database schema

Table A

 - id as primary key

 - b_fk as foreign key to table B

 - bar as another field

Table B

 - id as primary key

 - foo as a column

Table C

 - id as primary key

 - a_fk as foreign key to table A

Table D

 - id as primary key

 - a_fk as foreign key to table A

As you can see, A has many C's (a C belongs to A), A has many D's (a D belongs to A), an A has one (or none) B 

I'm running 2 queries (in a transaction, of course)

$ModelTableA->updateAll(

  array('A.b_fk' => null),

  array(

    'OR' => array(

       'A.b_fk' => $values,

       'A.bar'   => $value

     )

  )

);

$ModelTableB->deleteAll(

  array('B.id' => $ids)

);

The problem is that updateAll triggers more than one query. First it fetches some rows (from A table based on conditions from updateAll), then all dependecies (from C and D tables) and then runs the update on the A table based on primary keys not on the conditions I specified. The update part is ok, it updates what I want to be updated 

How can I disable this behavior?

I just want an atomic query, I don't want all the mambo-jambo, the C and D tables will be populated heavily, a lookup on them for a simple update action is not my intention.

Thank you for your help,

Adrian

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