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correct information about record identification in form helper #37353

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merged 1 commit into from Oct 4, 2019
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correct information about record identification in form helper #37353

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2 changes: 1 addition & 1 deletion guides/source/form_helpers.md
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Expand Up @@ -317,7 +317,7 @@ form_with(model: @article, url: article_path(@article), method: "patch")
form_with(model: @article)
```

Notice how the short-style `form_with` invocation is conveniently the same, regardless of the record being new or existing. Record identification is smart enough to figure out if the record is new by asking `record.new_record?`. It also selects the correct path to submit to, and the name based on the class of the object.
Notice how the short-style `form_with` invocation is conveniently the same, regardless of the record being new or existing. Record identification is smart enough to figure out if the record is new by asking `record.persisted?`. It also selects the correct path to submit to, and the name based on the class of the object.

WARNING: When you're using STI (single-table inheritance) with your models, you can't rely on record identification on a subclass if only their parent class is declared a resource. You will have to specify `:url`, and `:scope` (the model name) explicitly.

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