Alphabetize fields to make reading easier
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@ -109,8 +109,15 @@ them).
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Active Record provides methods that perform common data definition tasks in a
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database independent way (you'll read about them in detail later):
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* +create_table+ +change_table+ +drop_table+ +add_column+ +change_column+
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* +rename_column+ +remove_column+ +add_index+ +remove_index+
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* +add_column+
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* +add_index+
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* +change_column+
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* +change_table+
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* +create_table+
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* +drop_table+
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* +remove_column+
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* +remove_index+
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* +rename_column+
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If you need to perform tasks specific to your database (for example create a
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"foreign key":#active-record-and-referential-integrity constraint) then the
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@ -184,10 +191,20 @@ development machine) is relatively harmless.
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h4. Supported Types
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Active Record supports the following types:
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Active Record supports the following database column types:
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* +:primary_key+ +:string+ +:text+ +:integer+ +:float+ +:decimal+ +:datetime+
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* +:timestamp+ +:time+ +:date+ +:binary+ +:boolean+
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* +:binary+
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* +:boolean+
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* +:date+
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* +:datetime+
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* +:decimal+
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* +:float+
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* +:integer+
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* +:primary_key+
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* +:string+
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* +:text+
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* +:time+
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* +:timestamp+
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These will be mapped onto an appropriate underlying database type. For example,
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with MySQL the type +:string+ is mapped to +VARCHAR(255)+. You can create
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@ -455,8 +472,14 @@ The +change+ method removes the need to write both +up+ and +down+ methods in
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those cases that Rails know how to revert the changes automatically. Currently,
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the +change+ method supports only these migration definitions:
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* +add_column+ +add_index+ +add_timestamps+ +create_table+ +remove_timestamps+
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* +rename_column+ +rename_index+ +rename_table+
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* +add_column+
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* +add_index+
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* +add_timestamps+
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* +create_table+
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* +remove_timestamps+
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* +rename_column+
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* +rename_index+
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* +rename_table+
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If you're going to use other methods, you'll have to write the +up+ and +down+
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methods normally.
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