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fix documentation for SchemaStatements#add_foreign_key
The implementation of the generation of the foreign key name was changed between Rails 4.2.0 and 4.2.1 from a random to a deterministic behavior, however the documentation still describes the old randomized behavior.
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@ -690,8 +690,8 @@ module ActiveRecord
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# +to_table+ contains the referenced primary key.
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# +to_table+ contains the referenced primary key.
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#
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#
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# The foreign key will be named after the following pattern: <tt>fk_rails_<identifier></tt>.
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# The foreign key will be named after the following pattern: <tt>fk_rails_<identifier></tt>.
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# +identifier+ is a 10 character long random string. A custom name can be specified with
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# +identifier+ is a 10 character long string which is deterministically generated from the
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# the <tt>:name</tt> option.
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# +from_table+ and +column+. A custom name can be specified with the <tt>:name</tt> option.
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#
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#
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# ====== Creating a simple foreign key
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# ====== Creating a simple foreign key
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#
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#
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