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HI I would like to ask you if you could please explain the anatomy of the Openerp domain filters. I have to use it my project. Please explain the anatomy and description of the following domain filter .
['|',('order_id.user_id','=',user.id),('order_id.user_id','=',False)]
If you are having any resource concerning the same then please share it .
Thanks in advance ..
Domains are tuples, the structure is (field, operator, value).
Field is the data in the database, Operator is the comparison, = equal, != not equal, > greater than, < less than, etc. Value is the data you want to compare with the field, it can be another database field, a constant or a calculated value.
Typically when you send a domain into a function it is sent as an array so it must be contained with in brackets [ ] whether you have 1 or more tuples.
The default operator between tuples in the array is & (AND), to modify that you can use | to indicate OR
So in your example the domain is ['|',('order_id.user_id','=',user.id),('order_id.user_id','=',False)]
translated in to human: orders with the same user id OR a blank user id will be part of the domain.
Without seeing the rest of the code a better answer cannot be given on what exactly the domain will be because user.id is not known from that code alone.
This is the system used to create the structure for the domain:
https://en.wikipedia.org/wiki/Polish_notation
Study it (search Polish notation on a search engine) to understand this structure.
Hi thanks for the answer. but my actual concern is the anatomy .I want to know the exact meaning of (order_id.user_id','=',user.id) , what is order_id , user_id, and user.id. are they referencing any table . if yes then how am i supposed to know which one .... basically i want to know decipher the notation from bottom up so that can use it as per my requirement.
Hi Ahmad, if you want to know the meaning of order_id.user_id, here is my thought : in your entity that contain domain above, you have an attribute named order_id which typed as many2one with your another entity. So the "order_id.user_id" is refer to the user_id column in your another entity which referenced as many2one by the order_id attribute. As for the "user.id", I have no idea where is that come from, because your snippet code is too short. Hope this help.. :)
My method for simplification:
(1) Start with the outermost operator and move it to the start of the expression.
"(A operator B)" becomes "operator (A B)"
(2) Repeat step 1 for each sub expression with an operator to move.
"A operator (B operator C)" becomes "operator A (B operator C)" then "operator A (operator B C)"
(3) Remove all brackets.
"A operator (B operator C)" becomes "operator A operator B C"
So for my example:
( A or B ) AND ( C or D or E )
First simplification:
AND ( A or B ) ( C or D or E )
left side
AND ( or A B ) ( C or D or E )
right side outer
AND ( or A B ) ( or C ( D or E ) )
right side inner
AND ( or A B ) ( or C ( or D E ) )
remove brackets
AND or A B or C or D E
In Odoo domain syntax this would be:
[ '&', '|', (A), (B), '|', (C), '|', (D), (E) ]
You will find the answer here by @Ray Carnes
Really it's very good answer
https://www.odoo.com/forum/help-1/question/domain-notation-using-multiple-and-nested-and-2170
and to read more about Openerp Polish notation open this link http://en.wikipedia.org/wiki/Polish_notation
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