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[DOC] clear up some ambiguity with the way has_and_belongs_to_many creates the default join table name. #7072 [jeremymcanally]

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5960 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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Rick Olson
2007-01-16 06:30:02 +00:00
parent 71a4f7161f
commit 56c5535466
2 changed files with 9 additions and 1 deletions
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activerecord/CHANGELOG
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@@ -1,5 +1,7 @@
*SVN*
* [DOC] clear up some ambiguity with the way has_and_belongs_to_many creates the default join table name. #7072 [jeremymcanally]
* change_column accepts :default => nil. Skip column options for primary keys. #6956, #7048 [dcmanges, Jeremy Kemper]
* MySQL, PostgreSQL: change_column_default quotes the default value and doesn't lose column type information. #3987, #6664 [Jonathan Viney, manfred, altano@bigfoot.com]

8
activerecord/lib/active_record/associations.rb
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@@ -809,7 +809,13 @@ module ActiveRecord
# Associates two classes via an intermediate join table. Unless the join table is explicitly specified as
# an option, it is guessed using the lexical order of the class names. So a join between Developer and Project
# will give the default join table name of "developers_projects" because "D" outranks "P".
# will give the default join table name of "developers_projects" because "D" outranks "P". Note that this precedence
# is calculated using the <tt><</tt> operator for <tt>String</tt>. This means that if the strings are of different lengths,
# and the strings are equal when compared up to the shortest length, then the longer string is considered of higher
# lexical precedence than the shorter one. For example, one would expect the tables <tt>paper_boxes</tt> and <tt>papers</tt>
# to generate a join table name of <tt>papers_paper_boxes</tt> because of the length of the name <tt>paper_boxes</tt>,
# but it in fact generates a join table name of <tt>paper_boxes_papers</tt>. Be aware of this caveat, and use the
# custom <tt>join_table</tt> option if you need to.
#
# Deprecated: Any additional fields added to the join table will be placed as attributes when pulling records out through
# has_and_belongs_to_many associations. Records returned from join tables with additional attributes will be marked as