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Learning Rails: Live Edition by Edd Dumbill, Simon St. Laurent

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ActiveRecordHelper

The ActiveRecordHelper class seems intent on providing the fastest possible path from an ActiveRecord object to an HTML representation. These methods may be useful for putting together very quick demonstrations or for debugging purposes, but they aren’t likely to be your best choice for application-building. (In general, FormHelper and FormTagHelper are better choices for building forms.)

error_message_on

Returns a div containing the error message for a given object and method. You can add text before or after the message.

error_messages_for

Returns a div containing all the error messages for a given object. (The documentation suggests that you look at the code and make your own method if you need something more specific.)

form

Creates a POST-based form based on the ActiveRecord object, all in one call. You can add extra pieces to the form through a block, but mostly this is good for quick-and-dirty instant forms.

input

Creates an input element based on the type of the object and method it’s passed. It’s kind of like a field-by-field version of form.

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