Right now, in order to create a tag with the API, I create a temporary topic with the new tag, then delete the temporary topic. Is there a cleaner way?
I don’t know, but a slightly less painful solution would be to create a post in the staff category (where Assets for site design is) and just add the new tags there.
The reason is that you want to create a bunch of tags so that users can use them in the future, but your community doesn’t yet have posts with those tags?
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Thanks @pfaffman.
You mean manually adding the new tag? Or is it possible to use the “Update a single topic” API to add a tag to an existing topic? But in that case I would have to store the topic id, which is painful…
I guess this would be a legit use case. But mine is less legit: I use tags to store metadata (object ids from an external app).
Yeah, that’s not a good idea, especially if each tag is only used once.
You should either have a separate database mapping the external IDs to Discourse topic IDs, or write a plugin and use topic custom fields (this is a problem since there’s no existing mechanism to deliver these to the client, I think).
Another solution is to store the value in the post text.
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Since there is a legit use case, I believe adding a “new tag” API in the future would be a plus.
I can feel the danger of using tags the way I do. But as I need to display, in Discourse, a list of the topics that relate to a specific external object, the “tags.show” route seems the only way…
Well, what are the external objects? How many topics will one get? will a topic relate to multiple of these things?
You may be able to get away with using search.
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The external objects are document subsections. One topic relates to one and only one subsection. A minimum guess is: 100 documents x 100 subsections per document = 10,000 subsections = 10,000 tags in a single Discourse instance. I know this is dangerous, but since I’m in the prototype phase, tags are good enough for me.
Now I didn’t think about the search page before… I’ve just done some tests, but sadly, the results are not formatted like a topic list (with the ‘Replies’, ‘Views’ and ‘Activity’ columns). I guess a “topics only” checkbox that turns the result page into a standard Discourse topic list would be exactly what I need. 
Consider not pre-creating that many topics - there’s often not much to discuss about the Bibliography. You can have a small service that takes a document & subsection ID and redirects you to either the existing topic or opens the composer pre-filled with the document link, subsection ID, etc.
title: Procedures for Smelling, section Keyboards
body: <https://link.to/document/1234#sec-26>
[write your text here]
lookup key: DISCUSS_1234_26
Then it polls /latest.json for new topics and checks them for the magic ID reference phrase I put in on the last line of the example.
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Yes, I already have something like this. I don’t create the subsection tags beforehand when a document is created. I’ve changed the “tag not found” page of a subsection so that it looks like an empty topic list with a “New Topic” button at the top. When user clicks the button, I create the tag on the fly using the API and open the composer pre-filled with the generated tag.
Yes there is: create a tag group populated with the tag you want to create (see the API here).
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上述通过创建标签组来使用 API 创建标签的方法有一个缺点：仅管理员可以使用。
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还有另一种通过 API 创建标签的方法（但仍仅限管理员使用）：未公开的 /tags/upload.json 接口，由“上传标签”菜单使用。用法如下：
const tags = ['tag1', 'tag2']
const file = new Blob([tags.join('\n')], { type: 'text/plain' })
const formData = new FormData()
formData.append('file', file)
$.ajax({
type: 'POST',
url: '/tags/upload.json',
data: formData,
contentType: false,
processData: false
})
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如果我计划使用成千上万个标签，为每个标签创建一个组是否仍然是一个好的变通方案？标签组是否和标签一样灵活？
如果是这样，那就能解决我当前的难题。如果不是，我会尽量避免重复（即仅为一个标签同时创建标签和标签组）。
抱歉，我不清楚。
我好像记得，API 允许在一次操作中为单个组创建多个标签。
谢谢。是的，它允许我们在创建时于同一组内创建多个标签，但仅限于创建阶段。我们可以进行更新，但为此我需要先获取该组，追加内容，然后再将其发送回去。目前没有用于追加的端点。
关于你提出的第二个想法，即使用 /tags/upload.json 端点的那个方案：
我找到了界面中的上传按钮。我创建了一个 CSV 文件，在那里可以正常工作。但我无法在 Postman 或 Golang 中使其生效（如果你熟悉的话，我使用的是 csv.NewWriter）。
有什么建议吗？
抱歉，我不知道如何用这些工具创建并发布 blob。
已经知道怎么做了。
如果有人需要，请私信我。我不在这里发布是因为内容很长，而且可能对 99.99% 的社区成员来说并不相关。