// SourceInfo retrieves the source object including the canonical identifier.
func (n *NeoBackend) SourceInfo(mapping *models.Mapping) (string, int, error) {
q := fmt.Sprintf(`match (o:%s)-[r:KNOWS {id:'%s'}]->(s:source {name:'%s'}) return o.canonical`, mapping.ObjectType, mapping.SourceID, mapping.Source)
vals, err := graphExec([]string{q})
if err != nil {
return "", http.StatusInternalServerError, err
}
if len(vals) == 0 {
return "resource not found", http.StatusNotFound, errors.New("resource not found")
}
v := vals[0]["o.canonical"]
mapping.Canonical = v
mapping.Object += "/" + v
return mapping.Canonical, http.StatusOK, nil
}
// MapCreate creates a source object mapping to retrieve a canonical.
func (n *NeoBackend) MapCreate(mapping *models.Mapping) (code int, err error) {
// Create the source.
q := fmt.Sprintf(`merge (o:%s)-[r:KNOWS {id : '%s'}]->(s:source {name:'%s'}) on create set o.canonical='%s' return o.canonical`, mapping.ObjectType, mapping.SourceID, mapping.Source, mapping.Canonical)
vals, err := graphExec([]string{q})
if err != nil {
return http.StatusInternalServerError, err
}
v := vals[0]["o.canonical"]
if v != mapping.Canonical {
log.Println("POST with ", mapping.Canonical, " but resource already exists with canonical:", v)
mapping.Canonical = v
return http.StatusConflict, nil
}
return http.StatusCreated, nil
}