PG 搜索未返回预期记录

如何解决PG 搜索未返回预期记录

我有一个启用了 PG 搜索的 Call 模型：

class Call < ActiveRecord::Base
    has_one :employee
    include PgSearch::Model

    pg_search_scope :call_search,against: [:raw_digits,:referrer,:url,:direction],associated_against: {
            employee: [:name]
        },using: {
            tsearch: {
                prefix: true
            }
        }

记录的电话号码以 raw_digits 格式存储在字段 +1 XXX-XXX-XXXX 中。

我有 raw_digits: [phone] 的记录，但调用时结果为空：

> Call.call_search("567")
  Call Exists (2.3ms)  SELECT  1 AS one FROM "calls" INNER JOIN (SELECT "calls"."id" AS pg_search_id,(ts_rank((to_tsvector('simple',coalesce("calls"."raw_digits"::text,'')) || to_tsvector('simple',coalesce("calls"."referrer"::text,coalesce("calls"."url"::text,coalesce("calls"."direction"::text,coalesce(pg_search_5cd951feb4454dbf4e1632.pg_search_f6609a5466395faa400ca5::text,''))),(to_tsquery('simple',''' ' || '567' || ' ''' || ':*')),0)) AS rank FROM "calls" LEFT OUTER JOIN (SELECT "calls"."id" AS id,"employees"."name"::text AS pg_search_f6609a5466395faa400ca5 FROM "calls" INNER JOIN "foreign_ids" ON "foreign_ids"."external_id" = "calls"."aircall_user_id" AND "foreign_ids"."referenceable_type" = 'Employee' INNER JOIN "employees" ON "employees"."id" = "foreign_ids"."referenceable_id") pg_search_5cd951feb4454dbf4e1632 ON pg_search_5cd951feb4454dbf4e1632.id = "calls"."id" WHERE ((to_tsvector('simple',''))) @@ (to_tsquery('simple',''' ' || '567' || ' ''' || ':*')))) AS pg_search_f46f5990ebfadcab199107 ON "calls"."id" = pg_search_f46f5990ebfadcab199107.pg_search_id LIMIT $1  [["LIMIT",1]]
[]

我错过了什么吗？自从我设置了 prefix: true 后，即使该记录位于属性中间，该搜索也不应该返回该记录吗？顺便说一句，我正在运行 Postgresql 12.1。