On Nov 27, 7:54 am, "Greg Hauptmann" <[EMAIL PROTECTED]>
wrote:
> thanks - I'll have a look at the code - so would it be correct to say
> then that the Rails framework does effectively cast the params strings
> to their type prior to any saves to the data? (i.e. its not like it
> leave this up to the database to do itself is it, i.e. like if there
> was a date it doesn't just pass the string representation of the data
> through to the database to store in it's Date field)
Actually it doesn't (minor exception in that a blank string is turned
into nil for numbers). typecasting happens in read_attribute (check
the source for read/write_attribute.
Fred
>
> On Thu, Nov 27, 2008 at 5:31 PM, Frederick Cheung
>
> <[EMAIL PROTECTED]> wrote:
>
> > On Nov 26, 9:43 pm, "Greg Hauptmann" <[EMAIL PROTECTED]>
> > wrote:
> >> Hi,
>
> >> When/where does Rails convert "params" used to populate a model object
> >> from a form, into their correct types in the model object??? (i.e.
> >> from "string") What part of rails does this?
>
> > Well it's the call to column.typecast here:
> >http://github.com/rails/rails/tree/2-2-stable/activerecord/lib/active...
> > Which is defined here:
> >http://github.com/rails/rails/tree/2-2-stable/activerecord/lib/active...
>
> > (but possibly overriden by individual connection adapters).
>
> > How that interacts with BaseWithoutTable I have no idea.
>
> > Fred
> >> I have a form upload and in my create method where I go
> >> :@graph_options = GraphOptions.new(params[:graph_options])" it is not
> >> doing the type conversion, as the attributes remain as strings.
>
> >> Note I am using BaseWithoutTable
>
> >> ------------------
> >> class GraphOptions < ActiveRecord::BaseWithoutTable
> >> column :label_title, :string
> >> column :start_date, :date
> >> column :end_date, :date
> >> column :granularity, :integer
> >> column :chart_type, :integer
> >> .
> >> .
> >> .
> >> ------------------
>
> >> thanks
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