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collection in the view, fixed a typo at the validates_numericality_of section
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:only_integer option
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at the end of the page
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callback method name
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files to .gitignore
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Callbacks Guide, added new section to the Authors page
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Validations and Callbacks Guide
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guide
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about using error messages in view templates, added text about custom validation helpers
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config/environment files (AR Validations and Callbacks Guide)
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callback returns false (AR Validations and Callbacks Guide)
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errors collection (AR Validations an Callbacks Guide)
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callbacks guide
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validations helpers too
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validates_acceptance_of
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Active Record objects
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