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i have a filed with some values. I dont know before arriving in the page how many values are stored in.

The filed format is 

[hid_p2] => 2,3

in my read data action, i put a php where clause like this 

(nim_piece) in {var:hid_p2} , but i have only the last record in the read data debug.

because the {var:hid_p2} change of colour, i interpret this field in the where clause as a multi field value. the values  which works are {var:hid_p2} {var:hid_p3}...

my debug show this where clause :

 WHERE ( `Carac_d`.`id_devis` LIKE '721' ) AND ( `Carac_d`.`num_piece` LIKE '2,3' );

The output that i want to see is something like this 

 WHERE ( `Carac_d`.`id_devis` LIKE '721' ) AND (( `Carac_d`.`num_piece` LIKE '2' ) OR ( `Carac_d`.`num_piece` LIKE '3' ) ;

Should i modify the separator in the num_piece field, or should i do a custom php where clause ?

Or should i  do a custom php which cause the read data to have every field loaded?

return [["field", "value", "="], "OR", ["field", "xxx", "="]];

return [["field", "value", "=="], "AND", ["field2", "xxx", "!="]];

the in statement only show the first id. so i use a cutom php action to replace the read db actions and this works for me. For the sql command, i use the one which is shon on my debug tab ans directly modify it.

the data are available in the model as the read data should do. 

Thanks for your answer, it has made me to do the right choice quickly.

great, please note that in v8 you write the WHERE statement manually which gives you the freedom to do what you need