Hi Danielo
My goal is to take a tiddler and clear all its fields except the standard
> ones. At a first instance my flow it was going to be like this:
>
> 1. Take the tiddler from the store.
> 2. Copy all its fields to a new temp object
> 3. Create a new empty tiddler.
> 4. I suppose the empty tiddler has just the standard fields.
> 5. Delete those fields from my temp object.
> 6. Clear all the fields in the temp object.
> 7. Create a new tiddler with this order wiki.addTiddler(new
> $tw.Tiddler(oldTiddler,tempObject))
>
> I think what you need is something like this:
function removeNonStandardFields(wiki,title) {
var standardFieldNames = "title text tags modified modifier created
creator".split(" "),
tiddler = wiki.getTiddler(title);
if(tiddler) {
var clearFields = {};
for(var fieldName in tiddler.fields) {
if(standardFieldNames.indexOf(fieldName) === -1) {
clearFields[fieldName] = undefined;
}
}
wiki.addTiddler(new $tw.Tiddler(tiddler,clearFields));
}
}
Basically, any field set to "undefined" at the end of the cascade in the
$tw.Tiddler constructor will ensure that that field is absent from the
resulting tiddler.
Best wishes
Jeremy
> But the problem is that the new tiddler has any field.
>
> El jueves, 3 de abril de 2014 19:18:30 UTC+2, Jeremy Ruston escribió:
>>
>> Hi Danielo
>>
>> In TiddlyWiki, tiddler objects are immutable; once one has been created
>> the values of the fields cannot be changed. In 5.0.9, that restriction is
>> enforced, but at the moment there's nothing to stop erroneous code
>> modifying a tiddler object.
>>
>> To modify a tiddler, one instead overwrites the tiddler in the store with
>> a new tiddler with the same title. Here's the crucial line from the
>> function you quoted:
>>
>> self.wiki.addTiddler(new $tw.Tiddler(self.wiki.getCreat
>> ionFields(),tiddler,updateFields,self.wiki.getModificationFields()));
>>
>> If we separate things out, you can see that the constructor for
>> $tw.Tiddler is being called with four parameters. Each one is a hashmap of
>> field values; they are merged left to right, so that the rightmost field
>> with the same name wins. The resulting tiddler is then passed to
>> addTiddler() to add it to the store.
>>
>> Best wishes
>>
>> Jeremy
>>
>>
>>
>> On Thu, Apr 3, 2014 at 12:53 PM, Danielo Rodríguez <[email protected]>wrote:
>>
>>> Thank you BJ,
>>>
>>> Then, what is the difference between using $tw.wiki.addTiddler(tiddler)
>>> and new $tw.Tiddler() ?
>>> Could you explain me the syntax?
>>>
>>> El jueves, 3 de abril de 2014 10:15:14 UTC+2, BJ escribió:
>>>
>>>>
>>>> HI Danielo,
>>>> with the tw5 code, the Tiddler object is like a house that the actual
>>>> 'tiddler' ocupies. the actual 'tiddler' is known by it name, stored in
>>>> title field. When the 'tiddler' changes in some way it need to change its
>>>> house. the call to new $tw.Tiddler() get a new house for the tiddler. The
>>>> actual 'tiddler' itself is the data inside the old Tiddler object that must
>>>> be copied (and changed) and put in the new Tiddler object. Hope that helps!
>>>>
>>>> cheer
>>>>
>>>> Jeff
>>>>
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>>
>>
>>
>> --
>> Jeremy Ruston
>> mailto:[email protected]
>>
>
--
Jeremy Ruston
mailto:[email protected]
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