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Reorder paragraph and fix note.

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Benjamin Eberlei 2011-06-12 23:26:54 +02:00
parent d8f9c5380a
commit c187862e4f
1 changed files with 9 additions and 8 deletions
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17
en/reference/association-mapping.rst
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@ -945,14 +945,6 @@ entities:
// ...
}
**NOTE** Why are many-to-many associations less common? Because
frequently you want to associate additional attributes with an
association, in which case you introduce an association class.
Consequently, the direct many-to-many association disappears and is
replaced by one-to-many/many-to-one associations between the 3
participating classes.
Generated MySQL Schema:
.. code-block:: sql
@ -973,6 +965,15 @@ Generated MySQL Schema:
ALTER TABLE users_groups ADD FOREIGN KEY (user_id) REFERENCES User(id);
ALTER TABLE users_groups ADD FOREIGN KEY (group_id) REFERENCES Group(id);
.. note::
Why are many-to-many associations less common? Because
frequently you want to associate additional attributes with an
association, in which case you introduce an association class.
Consequently, the direct many-to-many association disappears and is
replaced by one-to-many/many-to-one associations between the 3
participating classes.
Many-To-Many, Bidirectional
---------------------------