Re: Thoughts on a CDBI::AsForm::_to_new()

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Here's a first shot at t_new functionality put in AsForm.pm.  It works. Maybe
the argument against AsForm making inputs for your foreign keys is why don't
you call to_cgi yourself with the classes for those columns.  I have a lot of
composite business objects. With  edit and create forms that becomes 2 calls
for every foreign key to to cgi. Most business objects have at least 2 foreign
objects they own. Take a Customer object, It often has address, person, phone,
email.

Here's an example of how to use my AsForm using the Customer object just
mentioned.

# This works only for has_a columns in customer 
Customer->has_a("address" => Address);
. . . 
Customer->has_a("email" => Email);

# Now If you want address, person, phone, email inputs on your Customer form
# say this:
Customer->has_a_new( { "address" => [ qw/street city zip state/],
                       "person"  => [ qw/first_name last_name/],
                       "phone"   => [ qw/area number/],
# Say we don't want email input  "email"   => [ qw/domain email want_ads/ ]
                     } );

#OK. Now if you say, 
my $customer_inputs = Customer->to_cgi;

# you get elements as normal but for the address, person, phone, you get a hash
of elements for the columns you specified.  Being able to specify columns you
want is nice. 

# IN your template you then make a macro to display a hash of elements or just
a foreach loop in every template you want to use it. Here's a for each

[% FOREACH col IN customer;
   element = customer_cgi.$col;
   IF (foreign_cols = element.keys);
      FOREACH fcol IN foreign_cols;
         element.$fcol.as_XML;
      END;
      NEXT;
   END;
   element.as_XML;
%]

YOu can see why you'd want that in a macro.

Changes to as form to make this work 

Added a _to_foreign_inputs method and exported it.
Added if clause that checks the has_a_new sub.

Attached is my version. Changes are well marked.  This also retrieves the
values if there are any for this object as you would expect so it works for
editing as well as creating. 

thanks,


--- Andreas Fromm <Andreas.Fromm@xxxxxx.xxxxxxxxxxxx.xx> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
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> 
> looks nice. I'll try it when as soon as I get the time too. It would be
> really usefull to incorporate such a thing in AsForm if the problem of
> the name clashes can be solved.
> 
> Mybe a better solution then prefixing the fields with the table name
> would be to prefix the fields with the fieldname of the referencing
> table. Otherwise you get the same problem if more then one field
> references the same table. (For example if a person-class references two
> phone-numbers, a private and an office number).
> 
> To simplify the formating of the resulting form via css, a class or id
> attribute should be set, probably the plain fieldname as a class
> attribute is a wise decission, so thata css-rule can be defined for all
> the phoen number-fields.
> 
> 
> Peter Speltz wrote:
> | --- Andreas Fromm <Andreas.Fromm@xxxxxx.xxxxxxxxxxxx.xx> wrote:
> |
> |
> |>-----BEGIN PGP SIGNED MESSAGE-----
> |>Hash: SHA1
> |>
> |>Ithink what Peter is trying to do, is what I'm also trying to do. If you
> |>have the following structure:
> |>
> |>table person:
> |>~   id serial
> |>~   name text
> |>~   adress integer references addresses
> |>~   phone integer references phones
> |>
> |>table addresses
> |>~   id serial
> |>~   street text
> |>~   number text
> |>~   city text
> |>~   zip text
> |>
> |>tabel phones
> |>~   id serial
> |>~   area text
> |>~   number text
> |>
> |>- -----------
> |>MyClass::Person
> |>
> |>__PACKAGE__->set-up-everything
> |>__PACKAGE__->has_a ( adress => MyClass::Addresses )
> |>__PACKAGE__->has_a ( phone => MyClass::Phones )
> |>
> |>- -----------
> |>CDBI::AsForm will make a form for person with select-boxes for address
> |>and phone, and what Perter (and I) would like to have is a form
> |>containing input-boxes for the fields from person, addresses and phones.
> |>Peter maybe asked for some extramagic of inserting default values for
> |>the non-referencing fields of person (didn't understand that part
> |>either). This is the reason why I don't use AsForm.
> |>
> |>I have been playing around with something like this a bit, but didn't
> |>found the time to finish it up. It would be nice to include something
> |>like this in AsFrom. My idea was to prefix the field names with the
> |>table name the fields belong to, such as the field 'name' would become
> |>'person.name', 'street' => 'address.street' and so on. Maybe
> |>CDBI::FromCGI could be tweeked to process that kind of requests
> |>properly, but I never looked at FromCGI in more detail then the
> description.
> |>
> |
> |
> | That's exactly it.  With a CDBI system with AsForm, the computer
> already knows
> | how to make these inputs. All it needs is for a class to tell it:
> "HEY, instead
> | of giving me a select box to choose an address, give me inputs to
> create a new
> | address (the result of address->to_cgi or something).  Basically, in
> its rawest
> | form, this functionality comes just by making to_cgi call its self
> with the
> | has_a class when signaled to and put a hashref in the relevant column
> slot
> | instead of a single HTML::whatever object. I tried it but the
> recursive call
> | failed.
> |
> | There are some some issues. As Andreas said, column name clashes become a
> | problem.
> |
> |  I ended up making a system with two parts  that lives in my own classes--
> |
> | 1) "has_a_new_inputs"  -- a part to generate other inputs for columns in a
> | class that are foreign keys , which lives in my base model class.
> |
> | 2)"has_a_new" --  a method to tell "has_a_new_inputs" what foreign
> keys I want
> | other inputs for, and further more what columns from that foreign
> class i want
> | inputs for.  This is specified in each end user class.
> |
> | Attached is the code and a full synopsis. I still haven't figured out
> what to
> | do about field name clashes so I just make sure i don't have any.
> |
> | I hope this is clear enough. I bet  AsForm could incorporate this
> | functionality. I made a feeble attempt at putting the has_a_new_inputs
> code
> | into AsForm::_to_new_inputs (new is a keyword in Template Toolkit and
> won't
> | work as a parameter). Then modifying AsForm::to_field to recognize a
> new_inputs
> | parametr. Then i could say:
> |
> | # get hashref of HTML::whatever objects instead of a single one.
> | my $addr_inputs = Person->to_field("address_id", "new_inputs").
> |
> | I'll try again as a proof of concept.
> |
> |
> | thanks
> |
> |
> |
> | =====
> | pjs
> |
> | __________________________________________________
> | Do You Yahoo!?
> | Tired of spam?  Yahoo! Mail has the best spam protection around
> | http://mail.yahoo.com
> |
> |
> | ------------------------------------------------------------------------
> |
> |
> | # expand foreign keys in a CDBI class to inputs for columns of the
> foreign class
> | # using AsForm methods.
> |
> | # TODO make this more robust
> | sub BaseCDBI::has_a_new_inputs {
> |     my ($self, $r) = @_;
> |     return 0 unless $self->can("has_a_new");
> |     my $has_a_new_cols = $self->has_a_new;  # HAS_A_NEW called here
> |
> |     foreach my $col (keys %$has_a_new_cols)
> |     {
> |         my ($has_a_class, @input_cols) = @{$has_a_new_cols->{$col}};
> |
> |         unless ($has_a_class->can('to_field') ) {
> |             warn "Class: $has_a_class can't to_field. Needs AsForm.";
> | 	    next;                                     	
> |         } # sanity check
> |
> |         my %res = map { $_ => $has_a_class->to_field($_) }  @input_cols;
> |         $result{$col} =  \%res;
> |     }
> |     return  \%result;
> | }
> |
> |
> | sub Person::has_a_new {
> |     { address_id => [ qw/Address street number city state zip/ ] },
> |     { phone_id   => [ qw/Phone area number/]
> | };
> |
> |
> |
> |
> | Synopsis:
> |
> | package Person;
> | Person->has_a(address_id => "Address");
> | Person->has_a(phone_id   => "Phone");
> |
> | # specify class and columns of that class you want inputs for in place
> of an
> | # input for the key column. Class spec won't be necessary in finished
> version
> | sub has_a_new {
> |     { address_id => [ qw/Address street number city state zip/ ] },
> |     { phone_id   => [ qw/Phone area number/]
> | };
> |
> | # then in some near by code
> |
> | $template_args{cgi_inputs} = Person->to_cgi;
> | my $other_inputs = Person->has_a_new_inputs;  #
> | $template_args{other_inputs} = $other_inputs
> |
> | # then in a new_person  TT template
> |
> | [% FOREACH $col IN cgi_inputs.keys;
> |      IF other_inputs.$col; # insert other inputs instead of to_cgi default
> | 	other_cols = other_inputs.$col; # stupid to lookup again
> |         FOREACH mycol IN other_cols.keys;
> |            "<label> $mycol </label>" other_cols.$mycol.as_XML;
> |         END;
> 
=== message truncated ===

=====
pjs


		
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