How to add multiple sql_query binds at once? - postgresql

Question

I am using diesel crate to comunicate with a PostgreSQL database.
I have a use case where i want to get data from table preferences into struct Preferences.
I want the output from databse to be filterd by tow fields in the table, to have a specific value in column org_id and to be in group of values in column team_id which i store their values in unknown length array, so i can't do
sql_query(raw_sql).bind::<>().execute()
because i don't know the number of
bind::<>()
then I tried to use collect_binds
but it didn't work, itried to do the following
let mut filter = "".to_string();
let mut params:Vec<i64> = vec![];
let mut c =1;
let org_id = 10;
filter.push_str("(org_id=$1 AND team_id IN (");
params.push(org_id);
for team_id in get_needed_teams_id(){
c = c +1;
filter.push_str(&*format!("${}", c));
params.push(team_id );
}
filter.push_str("))");
let raw_sql = format!("SELECT * FROM preferences WHERE {} ORDER BY user_id ASC, team_id ASC", filter);
let preferences:Vec<Preferences> = vec![];
let sql_res = sql_query(raw_sql).collect_binds(&mut param, &preferences);
Error returned :
error[E0284]: type annotations needed: cannot satisfy `<_ as Backend>::BindCollector == Vec<i64>`
--> src\db\preference_db.rs:146:38
|
146 | let sql_res = sql_query(raw_sql).collect_binds(&mut params, &preferences);
| ^^^^^^^^^^^^^ cannot satisfy `<_ as Backend>::BindCollector == Vec<i64>`

Answer 1

There is currently no way in diesel to bind multiple parameters at once in a loop. collect_binds is entirely unconnected to this and exported by the QueryFragment trait. It can be used by the database connection implementation to receive a list of bind parameters for a given query, not to construct a query.