ORM golang Relation with where clause - database

Question

I am stuck trying to make a query using the golang orm. What I want to do is get all Messages with Name x or y, in the Request with RequestID = request_id, but I want too to get the Requests with Method = z even the related messages name are not name_x or name_y. An example about what I want to get is, having this database:
request
id method created_at
0 z xxx
1 z xxx
2 m xxx
3 m xxx
trace
id request_id created_at
0 0 xxx
1 1 xxx
2 2 xxx
3 2 xxx
4 3 xxx
message
id trace_id name more_info
0 0 n name_n_0_method_z_0
1 0 x name_x_1_method_z_0
2 2 x name_x_2_method_m_2
3 2 n name_n_3_method_m_2
4 3 y name_y_4_method_m_3
So after my query, the messages I should have are:
name_n_0_method_z_0 (method is z)
name_x_1_method_z_0 (name is x and method is z)
name_x_2_method_m_2 (name is x)
name_y_4_method_m_3 (name is y)
and the not selected entries in this case is only one:
name_n_3_method_m_2 (the name is not x or y, and the method is not z)
What I am doing is:
type Request struct {
ID int64
Method string
RequestID string
Traces []Trace
CreatedAt time.Time `sql:",null"`
}
type Trace struct {
ID int64
RequestID int64
Messages []*Message
CreatedAt time.Time `sql:",null"`
}
type Message struct {
ID int64 `sql:"id"`
TraceID int64 `sql:"trace_id"`
Name string `sql:"name"`
MoreInfo string
}
func GetMessagesByNamesAndMethod(names []string, method, requestID string) {
query := db.Model(&requests).
Where("request.request_id = ?", requestID).
Order("created_at ASC")
query.
Relation("Traces", func(q *orm.Query) (*orm.Query, error) {
return q, nil
}).
Relation("Traces.Messages", func(q *orm.Query) (*orm.Query, error) {
// 1-> q.Where("name in (?) OR request.method = ?", pg.In(names),
q.Where("name in (?)", pg.In(names)) method) // <- 1.b
return q.OrderExpr("message.created_at ASC"), nil
})
// 2-> query.WhereOr("request.method = ?", method)
}
The commented lines are the last attempts I tried:
1 -> In this case I remove the line 1.b. Doing this, I get an error.
2 -> There is no error in the execution, but I am not able to get the method = z entries
I hope to be clear.
Thanks in advance.