Can Rails automatically parse datetime received from form text_field

问题:

Can Rails automatically parse a datetime received from a form's text_field?

# in view <div class="field">   <%= f.label :created_at %><br />   <%= f.textfield :created_at %> </div>  # in controller params[:product][:updated_at].yesterday 

Currently I'm get following error:

undefined method `yesterday' for "2010-04-28 03:37:00 UTC":String 

回答1:

If you are putting that param into a model directly, as the rails generator boilerplate code does, ActiveRecord takes care of that for you

def create     @product = Product.new(params[:product])     @product.updated_at.yesterday #will succeed     #rest of method end 

Other than that you are stuck with something like:

DateTime.parse(params[:product][:update_at]) 

or

DateTime.civil_from_format(:local, year, month, day, hour, minutes, seconds) 

But, in my experience .civil_from_format doesn't work as you'd expect with daylight savings time.

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