Appengine搜索语言

Question

I'm trying to implement search.FieldLoadSaver interface to be able to pick field language.

func (p *Product) Save() ([]search.Field, error) {
    var fields []search.Field

    // Add product.ID
    fields = append(fields, search.Field{Name: "ID", Value: search.Atom(p.ID)})

    // Add product.Name
    fields = append(fields, search.Field{Name: "Name", Value: p.Name, Language: "en"})

    return fields, nil
}

And i'm getting this error : errors.errorString{s:"search: INVALID_REQUEST: invalid language . Languages should be two letters."}

It seems that python devserver handles empty language field as an error.

EDIT: so the problem was that i was putting multiple fields with the same name and setting language to be empty. It appears that this isn't allowed, so when you're using multiple fields with same name, make sure you're putting language also.

Answer 1

I'm not sure what exactly your question is but here you can see that what you think (It seems that python devserver handles empty language field as an error.) is not true.

Code snippet from that documentation

type Field struct {
    // Name is the field name. A valid field name matches /[A-Z][A-Za-z0-9_]*/.
    // A field name cannot be longer than 500 characters.
    Name string
    // Value is the field value. The valid types are:
    //  - string,
    //  - search.Atom,
    //  - search.HTML,
    //  - time.Time (stored with millisecond precision),
    //  - float64,
    //  - appengine.GeoPoint.
    Value interface{}
    // Language is a two-letter ISO 693-1 code for the field's language,
    // defaulting to "en" if nothing is specified. It may only be specified for
    // fields of type string and search.HTML.
    Language string
    // Derived marks fields that were calculated as a result of a
    // FieldExpression provided to Search. This field is ignored when saving a
    // document.
    Derived bool
}

As you can see, if you specify no language, it defaults to "en"

However, as can be seen in the search api source code:

class Field(object):
  """An abstract base class which represents a field of a document.

  This class should not be directly instantiated.
  """


  TEXT, HTML, ATOM, DATE, NUMBER, GEO_POINT = ('TEXT', 'HTML', 'ATOM', 'DATE',
                                               'NUMBER', 'GEO_POINT')

  _FIELD_TYPES = frozenset([TEXT, HTML, ATOM, DATE, NUMBER, GEO_POINT])

  def __init__(self, name, value, language=None):
    """Initializer.

In particular This class should not be directly instantiated.

There are some other Field subclasses that you should be using instead. For your current example you should use (assuming that p.id is a string. Otherwise use NumberField)

class TextField(Field):
  """A Field that has text content.

and

class AtomField(Field):
  """A Field that has content to be treated as a single token for indexing.