我在ravendb中有以下索引,Changes_Which是一个命名字段,它映射到子集合
public My_Index()
{
Map = revisions => from revision in revisions
from change in revision.Changes
where (revision.AuditedType == "typeA")
select
new
{
revision.ChangeTimestamp,
Changes_Which = change.Which
};
}
修订版的json如下:
{
"AuditedType" : "typeA",
"Changes": [
{
"SubWhich": null,
"Which": "Regulation",
"Original": "Unknown",
"New": "Yes"
},
{
"SubWhich": null,
"Which": "Other",
"Original": "Unknown",
"New": "Yes"
},
{
"SubWhich": null,
"Which": "Regulation",
"Original": "Unknown",
"New": "Yes"
}
]
"ChangeTimestamp": "2011-05-03"
}
我正在尝试使用Changes_Which字段过滤索引中的结果:
var q = session.Advanced.LuceneQuery<revision>("My_Index/Index")
.WaitForNonStaleResultsAsOfLastWrite()
.AddOrder(paging.SortColumn, paging.SortOrder == "desc")
.Skip(((paging.CurrentPage - 1) * paging.RecordsPerPage))
.Take(paging.RecordsPerPage);
if (fromDate > DateTime.MinValue && toDate > DateTime.MinValue)
{
q = q.WhereGreaterThanOrEqual("ChangeTimestamp", fromDate)
.AndAlso()
.WhereLessThanOrEqual("ChangeTimestamp", toDate.AddDays(1).AddMinutes(-1));
}
if (removeNoChange)
{
q = q.AndAlso().Not.WhereEquals("Changes_Which", "Regulation");
}
这一行:
q = q.AndAlso()。Not.WhereEquals(“Changes_Which”,“Regulation”);
确实有效,但只删除了“哪个”:“规则”的第一个匹配,该集合中的第三个匹配仍然存在。
任何建议表示赞赏。
答案 0 :(得分:1)
原因是您要为同一文档输出不同的索引条目。 在RavenDB中搜索时,您正在搜索文档,在您的情况下,您筛选出该文档的第一个索引条目,但是还有其他索引条目匹配,因此会返回。
你可能会更好:
<!DOCTYPE html>
...
<div>
<?php if ( the_thing === true ) : ?>
<p>The thing is true! \o/</p>
<?php else if ( the_other_thing === true ) : ?>
<p>The other thing is true! meh</p>
<?php else : ?>
<p>Nothing is true :-(</p>
<?php endif; ?>
</div>
...
这将只输出每个文档的一个条目(建议使用),并将导致过滤因 Map = revisions => from revision in revisions
where (revision.AuditedType == "typeA")
select
new
{
revision.ChangeTimestamp,
Changes_Which = revision.Changes.Select(chnage => change.Which)
};