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mongox-go-driver/mongox/query/compose.go

55 lines
898 B

package query
import (
"github.com/mainnika/mongox-go-driver/mongox/errors"
"github.com/mongodb/mongo-go-driver/bson"
)
// ComposeQuery is a function to compose filters into a single query
func Compose(filters ...interface{}) *Query {
q := &Query{}
for _, f := range filters {
ok := false
ok = ok || applyBson(q, f)
ok = ok || applyLimits(q, f)
if !ok {
panic(errors.InternalErrorf("unknown filter %v", f))
}
}
return q
}
// applyBson is a fallback for a custom bson.M
func applyBson(q *Query, f interface{}) bool {
switch f := f.(type) {
case bson.M:
q.And(f)
default:
return false
}
return true
}
// applyLimits extends query with contol functions
func applyLimits(q *Query, f interface{}) bool {
switch f := f.(type) {
case Limiter:
q.limiter = f
case Sorter:
q.sorter = f
case Skipper:
q.skipper = f
default:
return false
}
return true
}