Another option is to roll your own date object and pass an instance of
it into the function instead.
Actually, this could be one way around the whole type safety / null
problem with cf - develop a system of object types (Date.cfc,
Integer.cfc, String.cfc, etc). Then you could choose to work with
September 2005 13:11
To: CFCDev@cfczone.org
Subject: RE: [CFCDev] Default for Dates in a Transfer object
Another option is to roll your own date object and pass an instance of
it into the function instead.
Actually, this could be one way around the whole type safety / null
problem with cf
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kerry
Sent: Wednesday, September 21, 2005 3:21 PM
To: CFCDev@cfczone.org
Subject: RE: [CFCDev] Default for Dates in a Transfer object
basically an isNull() method
hmm, would that return true simply if the value had zero length?
or only if it had
PROTECTED] On Behalf Of Bill Rawlinson
Sent: Wednesday, September 21, 2005 3:32 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
Kerry,
You would define you're own rule for what a NULL is for that type
since you're creating the component.
If a zero-length
: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill Rawlinson
Sent: Wednesday, September 21, 2005 3:32 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
Kerry,
You would define you're own rule for what a NULL is for that type
since you're
Sent: Wednesday, September 21, 2005 4:00 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
or, if you did want to null the object you could have a method,
setNull() which just turns the flag back on.
cfset myString = createobject(component,types.String
Of Bill Rawlinson
Sent: Wednesday, September 21, 2005 4:00 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
or, if you did want to null the object you could have a method,
setNull() which just turns the flag back on.
cfset myString = createobject
@cfczone.org
Subject: RE: [CFCDev] Default for Dates in a Transfer object
but then you'd be open to the weird situation of having an object that
claims it is null but contains a value.
If you need a null object, just create a new one and don't initialize
it.
/t
-Original Message-
From: [EMAIL
Maybe you could have two different objects: a value object and a null
object. For example, you could have a Date object that always has a
value, and a NullDate that extends Date and doesn't have a value.
- You don't skip the init method. (Bill's concern.)
- An object can't simultaneously have a
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Patrick McElhaney
Sent: Wednesday, September 21, 2005 5:51 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
Maybe you could have two different objects: a value object and a null
object. For example, you could have
If you don't require a date, then you can't qualify the argument as a
date, because CF has no concept of NULL. The closest you can get is
saying is equivalent to null, and then using the string type as you
propose. You should do validation inside your method like this:
cfif
Some will say use a string data type and return an empty
string. I don't much care for this option.
Others will say use a date date type and return a "null"
date such as 1/1/1900. Again, I don't much care for this option,
either.
Still more others will say throw/catch an exception if this
Good point Barney.
Barney Boisvert wrote:
If you don't require a date, then you can't qualify the argument as a
date, because CF has no concept of NULL. The closest you can get is
saying is equivalent to null, and then using the string type as you
propose. You should do validation inside
Peter Hardy wrote:
Hi guys,
I've seen this on the forum before but I'm can't remember the answer
at all.
I've created a transfer object that takes amongst others a couple of
date parameters. Trouble is, they are optional parameters so sometimes
they are a valid date and sometimes they
these.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Barney Boisvert
Sent: Tuesday, September 20, 2005 9:29 PM
To: CFCDev@cfczone.org
Subject: Re: [CFCDev] Default for Dates in a Transfer object
If you don't require a date, then you can't qualify the argument
On 9/20/05, Peter Hardy [EMAIL PROTECTED] wrote:
I've created a transfer object that takes amongst others a couple of date
parameters. Trouble is, they are optional parameters so sometimes they are a
valid date and sometimes they are equal to . If my cfargument type to date
cf just throws an
The problem is that 'string' is way too lenient, because you want to
allow dates, the empty string and that's it. A type of 'string' will
also allow hulabaloo to be passed without error, which is
undesirable. Of course, you HAVE to use type=string in order to
circumvent CF's weird type system,
Boisvert Sent: Tuesday, September 20, 2005 9:29 PM To:
CFCDev@cfczone.org Subject: Re: [CFCDev] Default for Dates in a Transfer object If you don't require a date, then you can't qualify the argument as a date, because CF has no concept of NULL.The closest you can get is
saying is equivalent to null
On 9/20/05, Barney Boisvert [EMAIL PROTECTED] wrote:
If you ask me, CF's lack of NULL is really quite a burden. CF is a
loosely typed language, which is fine, but then they came and added in
strong typing all over the place, but didn't provide the ability to
use NULL, so the strong typing is
On 9/20/05, Barney Boisvert [EMAIL PROTECTED] wrote:
The problem is that 'string' is way too lenient, because you want to
allow dates, the empty string and that's it. A type of 'string' will
also allow hulabaloo to be passed without error, which is
undesirable.
So make an error. Throw an
So make an error. Throw an exception if the string isn't empty and
can't be converted to a date.
Which is exactly what the code I proposed earlier does.
(and may as
well just leave the attribute off). Not that I recommend that
I'm on the verge of recommending it.
Strong typing is a
Yeah, me too. I tried loose typing for a while but it drives me crazy. As for ColdFusion being easy to use, yip, it can be. It can also be a right royal pain in the tucus. And don't get me started on the whole RADness of it.
Sorry guys, am having a grrr day. Will play nice tomorrow I promise:)
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