ArangoDB AQL Upsert如何将值推入列表

Question

Trying to use the UPSERT in AQL and successful intill I need to push a value into an list array (and I also need ot check if it exists although I think I have that)

Code

const t_list_ = db._query(aql`
        UPSERT { token_name: ${token_i}, type: ${type}}
        INSERT { token_name: ${token_i},
                 type: ${type},
                 frequency: ${tokens[i].frequency},
                 user_list: [${req.pathParams.user_id}] }
        UPDATE { frequency: OLD.frequency + ${tokens[i].frequency},
                 user_list: OLD.user_list.push(${req.pathParams.user_id})}
             IN token_category
        RETURN { doc: NEW, type: OLD ? 'update' : 'insert' }`).toArray()

Error is : ArangoError: syntax error, unexpected (, expecting } near '(@value3)} IN token_category

Answer 1

The language used here is Javascript. Simplifying the query as used here:

let foo="bar";
db._query(aql`RETURN ${foo}`).toArray()

is actually using a specialized AQL-Template string to generate bind values. To dismantle what is actualy handed into db._query() we may use JSON.stringify() :

print(JSON.stringify(aql`RETURN ${foo}`))
{"query":"RETURN @value0","bindVars":{"value0":"bar"}}

here you see where that string came actually from that was there in the error message: @value3 actually is a bind variable for one of the expressions you've inserted into the template.

So the actual line in question of the syntax error is this one:

        UPDATE { frequency: OLD.frequency + ${tokens[i].frequency},
                 user_list: OLD.user_list.push(${req.pathParams.user_id})}

and here you're mixing AQL syntax with Javascript-Syntax, which is not supported.