如何使用底座(CouchDB)将参数传递给视图 [英] How can I pass parameters to a view using cradle (CouchDB)

问题描述

使用摇篮，我如何能够将参数传递给CouchDB中的视图?


更新

Using cradle, how am I able to pass parameters to a view in CouchDB?


Update

说我想返回与_key(默认值)以外的其他属性匹配的文档...

Say I want to return documents which match other properties than _key (the default)...

// document format
{
    _key,
    postHeading,
    postBody,
    postDate
}

如果我想使文档与postHeading属性匹配...该怎么办?视图将是什么样，如何将搜索字符串传递给该视图?


目前，我正在这样做...

What if I wanted to match documents against the postHeading property... How would I go about this? What would the view look like, and how would I pass a search string to that view?


At the moment I'm doing this...

database.get("980f2ba66d5c8f9c91b9204a4d00022a", function (error, document)
{           
});

我想访问一个视图，而不是40个字符长的自动生成的密钥，我想传递一个字符串，匹配另一个属性.

I would like to access a view instead, and instead of the 40 character long auto-generated key, I'd like to pass a string, matching another property.

与此类似的事物...

Something along the lines of this...

database.save("_design/posts", {
    single: {
        map: function (document)
        {
            if (document.postHeading == PARAMETER_PASSED_GOES_HERE)
                emit(null, document);
        }
    }
});

database.view("posts/single", function (error, documents)
{           
});

推荐答案

如果要查询视图，请尝试将第二个参数作为选项对象传递给您的设置，例如:

If you are querying a view try to pass second parameter as options object with your settings, for example:

db.view('characters/all', {descending: true}, function (err, res) {
    res.forEach(function (row) {
        sys.puts(row.name + " is on the " +
                 row.force + " side of the force.");
    });
});

另外请注意:

某些查询字符串参数的值 必须使用JSON编码.

Some query string parameters' values have to be JSON-encoded.

---

据我所知，您无法在CouchDB中创建视图，您无法在其中传递自定义参数，该参数将在map/reduce函数代码中使用.您必须从地图函数中发出键，并基于它们可以使用诸如startkey和endkey之类的参数查询视图.尝试查看数据库查询CouchDB方式文章.

As far as I know you can't create a view in CouchDB where you pass your custom parameter which will be used in map/reduce function code. You have to emit keys from your map function and based on them you can query the view with parameters like startkey and endkey. Try to look at Database Queries the CouchDB Way article.

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