Question

在我的后端应用程序中，我有一个Entity PositionAugmented

@Entity 
public class PositionAugmented {

@Id
Long id;
@Index
Position position;
@Index
String username;
...
}

其中职位变量

public class Position{

Date time;
double latitude;
double longitude;
@Index
public Address address;
...
}

和地址由

组成

public class Address{

@Index public String city;
...
}

使用objectify，我需要找到属于特定城市的所有PositionAugmented实例。我正在使用的实际查询如下：

public List<PositionAugmented> getPositionAugmentedsByCity(String aCity){
    Query query = ofy().load().type(PositionAugmented.class).
                   filter("position.address.city=", aCity);
    return query.list();
}

不幸的是，这给我一个空列表。我看到这个后尝试了这个查询：

wiki objectify v5 queries on embedded class

任何帮助将不胜感激

Answer 1

我认为你错过了indexed-property-name和＆＃39; =＆＃39;之间的空格。试试这个：var data = ".xxx[val1, val2, val3, val4, val5]"; var pattern = @" [^[]+ # Consume anything that is *not* a brace # but don't match it , (.xxx is the first anchor) \[ # Starting brace consumed ( # Start of match captures (?<Token>[^\s,\]]+) # Named Match grouping called `Token` where one or more # of anything not a space, comma or end brace is captured. [\s,\]]+ # Consume the token's `,` or space or final bracket. )+ # End match captures, one or more ] # Ending brace." ; // IgnorePatternWhitespace allows us to comment the pattern, // does not affect parser processing. Regex.Match(data, pattern, RegexOptions.IgnorePatternWhitespace) .Groups["Token"] .Captures .OfType<Capture>() .Select(cp => cp.Value);

objectify v5查询过滤器由嵌入式类中的属性过滤

1 个答案: