Algolia 切面属性多个值

Question

我有一个属性 "bodyType"，它有多个值，如轿车、suv、coupe 等。如果我想搜索轿车，我应用 [@"bodytype:sedan"] 之类的 facetFilters 并且它有效很好，但如果我想同时看到轿车和 suv，那么我会执行 [@"bodyType:sedan"、@"bodyType:suv"] 并且结果 returns 为零。我正在使用 objective c ios sdk.

提前致谢

Answer 1

快速查看了文档，听起来 filters 属性可以满足您的需求：

/**
 * Filter the query with numeric, facet or/and tag filters. The syntax is a SQL like syntax, you can use the OR and AND keywords.
 * The syntax for the underlying numeric, facet and tag filters is the same than in the other filters:
 * available=1 AND (category:Book OR NOT category:Ebook) AND public
 * date: 1441745506 TO 1441755506 AND inStock > 0 AND author:"John Doe"
 * The list of keywords is:
 * OR: create a disjunctive filter between two filters.
 * AND: create a conjunctive filter between two filters.
 * TO: used to specify a range for a numeric filter.
 * NOT: used to negate a filter. The syntax with the ‘-‘ isn’t allowed.
 */
@property (nonatomic) NSString             *filters;

举个例子：

NSString *filterString = @"bodyType:sedan OR bodyType:suv";

ASRemoteIndex *indexForClient = [self getIndex:BASIC_INDEX_NAME]; 
ASQuery *newQuery = [[ASQuery alloc] init]; 
[newQuery setHitsPerPage:[HITS_PER_PAGE integerValue]]; 
[newQuery setPage:pageNumber]; 

if (filtersString) { 
    [newQuery setFilters:filtersString]; 
}

if (tagFilters) { 
    [newQuery setFullTextQuery:tagFilters]; 
} 

if (filterString.length) { 
    [newQuery setFilters:filterString]; 
}

Answer 2

使用 facetFilters 时，顶级过滤器是隐式连接的（即与 AND 运算符组合）。这就是您看不到任何结果的原因：两个结果集的交集为空。

要提供析取过滤器（OR 运算符），请使用嵌套数组，如 documentation:

中所述

[["bodyType:sedan", "bodyType:suv"]]

将 filters 与 bodyType:sedan OR bodyType:suv 一起使用也可以。

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