# 为什么新建的类别里会有一篇帖子？
**URL:** https://meta.discourse.org/t/why-does-fabricating-a-category-have-a-post-in-it/100844
**Category:** Development
**Created:** [2018年十月30日 05:01 UTC](https://meta.discourse.org/t/why-does-fabricating-a-category-have-a-post-in-it/100844 "2018-10-30T05:01:18Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Kampfkarren](https://meta.discourse.org/u/Kampfkarren)
#### Post date: [2018年十月30日 05:01 UTC](https://meta.discourse.org/t/why-does-fabricating-a-category-have-a-post-in-it/100844/1 "2018-10-30T05:01:18Z")
```rb
category = Fabricate(:category)
puts Topic.where(category_id: category).count # 1
```
Is this not surprising behavior? This tripped me up when writing a test that relies on the number of posts in a category, am I thinking about this wrong?
---
### Author:  [@Mittineague](https://meta.discourse.org/u/Mittineague)
#### Post date: [2018年十月30日 05:47 UTC](https://meta.discourse.org/t/why-does-fabricating-a-category-have-a-post-in-it/100844/2 "2018-10-30T05:47:10Z")
I don’t know where you saw this, so without context this is a best guess.
All categories have at least one topic - the “about the \_\_\_ topic”.
I’m thinking the test expects, or even depends on, the test conditions being as close to being the same as the “non-test” conditions as possible.
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [2018年十月30日 05:57 UTC](https://meta.discourse.org/t/why-does-fabricating-a-category-have-a-post-in-it/100844/3 "2018-10-30T05:57:49Z")
Yes, what @Mittineague said, this is the “about XYZ topic”
>