func (PageResource) ApiAlterQuery(res kit.Resource, query db.Query, r kit.Request) apperror.Error {
typ := r.GetContext().String("type")
if typ != "" {
query.Filter("type", typ)
}
return nil
}
func Find(res kit.Resource, request kit.Request) (kit.Response, apperror.Error) {
collection := res.Collection()
info := res.Backend().ModelInfo(collection)
var query *db.Query
jsonQuery := request.GetContext().String("query")
if jsonQuery != "" {
var rawQuery map[string]interface{}
if err := json.Unmarshal([]byte(jsonQuery), &rawQuery); err != nil {
return nil, apperror.Wrap(err, "invalid_query_json")
}
rawQuery["collection"] = collection
// A custom query was supplied.
// Try to parse the query.
var err apperror.Error
query, err = db.ParseQuery(res.Backend(), rawQuery)
if err != nil {
return nil, apperror.Wrap(err, "invalid_query", "", false)
}
}
if query == nil {
query = res.Backend().Q(collection)
}
// Check paging parameters.
var limit, offset int
context := request.GetContext()
if context.Has("limit") {
val, err := context.Int("limit")
if err != nil {
return nil, &apperror.Err{
Public: true,
Code: "non_numeric_limit_parameter",
Message: "The get query contains a non-numeric ?limit",
}
}
limit = val
}
if context.Has("offset") {
val, err := context.Int("offset")
if err != nil {
return nil, &apperror.Err{
Public: true,
Code: "non_numeric_offset_parameter",
Message: "The get query contains a non-numeric ?offset",
}
}
offset = val
}
var page, perPage int
if context.Has("page") {
val, err := context.Int("page")
if err != nil {
return nil, &apperror.Err{
Public: true,
Code: "non_numeric_page_parameter",
Message: "The get query contains a non-numeric ?page",
}
}
page = val
}
if context.Has("per_page") {
val, err := context.Int("per_page")
if err != nil {
return nil, &apperror.Err{
Public: true,
Code: "non_numeric_per_page_parameter",
Message: "The get query contains a non-numeric ?per_page",
}
}
perPage = val
}
if perPage > 0 {
limit = perPage
}
if page > 1 {
offset = (page - 1) * limit
}
if limit > 0 {
query.Limit(int(limit)).Offset(int(offset))
}
// Add joins.
if context.Has("joins") {
parts := strings.Split(context.String("joins"), ",")
for _, name := range parts {
relation := info.FindRelation(name)
if relation == nil {
return nil, &apperror.Err{
Code: "invalid_join",
Message: fmt.Sprintf("Tried to join a NON-existant relationship %v", name),
Public: true,
}
}
query.Join(relation.Name())
}
}
// Add filters.
if context.Has("filters") {
parts := strings.Split(context.String("filters"), ",")
for _, filter := range parts {
filterParts := strings.Split(filter, ":")
if len(filterParts) != 2 {
return nil, &apperror.Err{
Public: true,
Code: "invalid_filter",
Message: fmt.Sprintf("Invalid filter: %v", filter),
}
}
fieldName := filterParts[0]
// COnvert id query to pk field.
if fieldName == "id" {
fieldName = info.PkAttribute().BackendName()
}
var typ reflect.Type
if attr := info.FindAttribute(fieldName); attr != nil {
fieldName = attr.BackendName()
typ = attr.Type()
} else if rel := info.FindRelation(fieldName); rel != nil {
if rel.RelationType() == db.RELATION_TYPE_HAS_ONE {
fieldName = rel.LocalField()
typ = info.Attribute(rel.LocalField()).Type()
} else {
return nil, &apperror.Err{
Public: true,
Code: "cant_filter_on_relation",
Message: fmt.Sprintf("Tried to filter on relationship field %v (only possible for has-one relations)", fieldName),
}
}
} else {
return nil, &apperror.Err{
Public: true,
Code: "filter_for_inexistant_field",
Message: fmt.Sprintf("Tried to filter with inexistant field %v", fieldName),
}
}
converted, err := reflector.R(filterParts[1]).ConvertTo(typ)
if err != nil {
return nil, &apperror.Err{
Public: true,
Code: "inconvertible_filter_value",
Message: fmt.Sprintf("Coult not convert filter value %v for field %v (should be %v)",
filterParts[1], fieldName, typ),
}
}
query.Filter(fieldName, converted)
}
}
return res.ApiFind(query, request), nil
}