如何使用 Clojure 和 appengine-magic 保存 Text 属性

发布于 2024-10-29 04:57:51 字数 912 浏览 4 评论 0原文

表单的 body 字段可能包含长文本，因此默认的 String 属性不起作用。

寻找如何使数据存储区使用文本（这不是实体定义的一部分，就像我从 Python 版本中回忆的那样），我在 ackbar 博客的源代码中找到了这一点：

(ns <snip>
  (:import (com.google.appengine.api.datastore
            EntityNotFoundException Text)))
<snip>
(ds/save! (Post. url title (Text. body) ts in-feed? category))

但如果我这样做，我会得到：“java .lang.RuntimeException: java.lang.IllegalArgumentException: 不知道如何从 com.google.appengine.api.datastore.Text 创建 ISeq”

（一个显着的区别是我正在查看的 ackbar 使用 appengine-magic 0.3.2。）

我还尝试了 https 上简要提到的 as-text ://github.com/gcv/appengine-magic#readme，但其中的 (as-text body) 会导致与上面相同的错误消息。

编辑：事实证明，问题实际上并不是将 Text 属性放入存储中，而是在检索它时理解它。我的提交处理程序触发保存并重新加载表单页面，但我没有想到这一点。抱歉产生噪音。

毫无问题地获取值的方法是(.getValue body)。

原文

The body field of a form may contain long text, so the default String property won't do.

Looking for how to make the datastore use Text (this is not part of the entity definition like I recall from the Python version), I found this in the source of the ackbar blog:

(ns <snip>
  (:import (com.google.appengine.api.datastore
            EntityNotFoundException Text)))
<snip>
(ds/save! (Post. url title (Text. body) ts in-feed? category))

But if I do the same, I get: "java.lang.RuntimeException: java.lang.IllegalArgumentException: Don't know how to create ISeq from: com.google.appengine.api.datastore.Text"

(One notable difference is that the ackbar I'm looking at uses appengine-magic 0.3.2.)

I also tried as-text as briefly mentioned on https://github.com/gcv/appengine-magic#readme, but (as-text body) in there leads to the same error message as above.

EDIT: Turned out the problem wasn't actually to get a Text property into the store, but to make sense of it when retrieving it. My Submit handler triggers saving and than a reload of the form page, and I failed to think of that. Sorry for the noise.

The way to get the value out without hiccup is (.getValue body).

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