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Ecto.Schema.belongs_to/3 documentation: Polymorphic associations #15

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toraritte opened this issue Jun 15, 2018 · 0 comments
Open

Ecto.Schema.belongs_to/3 documentation: Polymorphic associations #15

toraritte opened this issue Jun 15, 2018 · 0 comments

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@toraritte
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toraritte commented Jun 15, 2018 •
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DON'T CONFUSE WITH MANY-TO-MANY!

https://hexdocs.pm/ecto/Ecto.Schema.html#belongs_to/3-polymorphic-associations

In Ecto, we have three ways to solve this issue. The simplest is to define multiple fields in the Comment schema, one for each association:

* task_id
* post_id

Unless you have dozens of columns, this is simpler for the developer, more DB friendly and more efficient in all aspects.

Is my assumption correct that here schema is used interchangeably with the repo (i.e., the database schema)?
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