Ok, I fully understand your post.

So we agree isEnabled should be immutable and not computed.

This is not what David proposed. To take his own words : 

> My original proposal was to allow isEnabled to be computed by the backend

My previous answer was just about saying if isEnabled is a computed value, 
then we will have troubble. If ever we want to return a computed value, we 
should do it on an other field to avoid ambiguous scenari.

Regards,

Benoit

On Monday, June 27, 2016 at 4:28:03 PM UTC+7, Bron Gondwana wrote:
>
>
>
> On Mon, Jun 27, 2016 at 7:23 PM, Benoit Tellier <[email protected] 
> <javascript:>> wrote:
>
>> I am also in favour of clarifying this.
>>
>> Do we agree that, as a client, I can update from / to dates even if the 
>> vacation is not enabled ?
>>
>> As such, I can first disable the vacation by sending an update with : 
>>
>> {
>>     isEnabled : false,
>>     fromDate : null,
>>     toDate : null
>> }
>>
>>
> That's not what you would do.  You would disable the vacation by sending:
>
> {
>    isEnabled: false
> }
>
> Why would you null the dates?  That's just silly.
>
>  
>
>> Then modify the dates : 
>>
>> {
>>     fromDate: "date in one week",
>>     toDate : "date in two weeks"
>> }
>>
>> After this I will get this as a result from the GetVacationResponse :
>>
>> {
>>     isEnabled: false,
>>     fromDate: "date in one week",
>>     toDate : "date in two weeks",
>>     textBody : "My so desired vacation text"
>> }
>>
>> Now, if I sended this as an update : 
>>
>> {
>>     isEnabled: true,
>>     fromDate: "date in one week",
>>     toDate : "date in two weeks"
>> }
>>
>> I will end up with the exact same result, as we are out of the date 
>> range, so isEnabled is false. We can no more differenciate a vacation in 
>> one week from a vacation that will never happen, but happen to have some 
>> fromDate and toDate specified. 
>>
>>
> You are confused between two concepts:
>
> isEnabled - this is like a light switch that's turned on.  If there is 
> power, the light will come on.  The power is only connected between "in one 
> week" and "in two weeks" from now.  If the switch is still on at that 
> point, the bulb will light.
>
> isActive - this is a computed value which tells you if, RIGHT NOW, the 
> light is on - aka, you would receive a vacation response if you emailed 
> this account.
>
> Neil and I are in favour of sending isEnabled - the state of the light 
> switch - over the API.  We're not in favour of sending isActive - the 
> current state of the lightbulb.  That's a computed value, not a settable 
> field.
>  
>
>> With such a specification, the client can just know if the vacation is 
>> active right now. But can not know about not yet active vacations. UX 
>> scenari like displaying the vacation in a calendar are no more possible...
>>
>>
> Sure it can, because isEnabled doesn't change with the date.  It's just 
> what the light switch is set to.
>
>  
>
>> That's why I am reluctant to modify the isEnabled value, and propose to 
>> add an other value (isActivated) that prevents from this ambiguity.
>>
>> Regards,
>>
>> Benoit
>>
>> On Monday, June 27, 2016 at 3:54:48 PM UTC+7, Neil Jenkins wrote:
>>>
>>> Right, I see where the misunderstanding is; we need to clarify this in 
>>> the spec. The isEnabled property is *combined* with the from/to dates, 
>>> which are both optional/nullable (if the vacation response should be 
>>> enabled until manually turned off), to decide whether to send a vacation 
>>> response or not.
>>>  
>>> Neil.
>>>
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