January 1999 - Zope - Zope lists

- problem with date variable
by chalaouxf＠synbio.tpgnet.net 15 Jan '99

15 Jan '99

Hi All, The variable 'date'  does not work for me !? :( did somebody get this problem? Bye, FR. François-Régis Chalaoux Bioinformatics Group Synthélabo Biomoléculaire 67080 Strasbourg Cedex FRANCE Tél : 03 88 60 87 14 Fax : 03 88 45 90 70

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- How do I NOT acquire an object from a parent?
by Brad Clements 15 Jan '99

15 Jan '99

Well, I'm working on my web site for "New York State Aviation", and it's starting off fairly well.. I wanted to model the layout similar to www.Zope.org I'm using TinyTable to create my folder specific sidebar (it's great) But, I'd like subfolders to be able to add their own "middle sidebar" if a property is defined in that folder, (and not two folders above). How can I check to see if a given property exists in the current folder, and isn't being acquired from above? How can I use style sheets with zope? I see zope.org has a style sheet. Do I just upload the .css file as a file object in the parent and refer to it in the standard_html_header? It'd be nice if a "Document" could be structuredText. I was thinking of adding a "fmt" property to a document and setting it to "StructuredText" but I don't think that'd work. To use structuredText, I have to have two file objects defined. Any suggestions to work around this? Paul also said in www.egroups.com/list/zope/922.html, that Amos was working on documenting "mailto, relative URLs, footnotes".. I've looked through StructuredText.py and can't figure out urls or mailto's in the .py I have. Is that because it's not supported, or not documented? -- Now I just need to add 44 folder objects, one for each airport in new york.. sigh Brad Clements, bkc(a)murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax netmeeting: ils://ils.murkworks.com ICQ: 14856937 We must come down from our heights, and leave our straight paths, for the byways and low places of life, if we would learn truths by strong contrasts; and in hovels, in forecastles, and among our own outcasts in foreign lands, see what has been wrought upon our fellow-creatures by accident, hardship, or vice. - Richard Henry Dana, Jr. 1836

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- Subclassing document...?
by Magnus Lie Hetland 15 Jan '99

15 Jan '99

Just a thought about "pluggable formats"/stx... Wouldn't it be possible to just subclass "Document"? -- Magnus Lie Hetland www.pvv.org/arcadia <arcadia(a)pvv.org>

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- Re: Can we get the docs in FrameMaker format?
by Chris Halverson 15 Jan '99

15 Jan '99

LD Landis <ldl(a)LDL.HealthPartners.COM> writes: > As long as requests for formats are being made... > I really prefer having postscript available. Ditto. One can always use psnup to get 4x1 pages and such. HTML sucks for printed docs. Chris -- Chris D. Halverson Complete Internet Solutions PGP mail accepted, finger for public key http://www.CompleteIS.com/~cdh/

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- Can we get the docs in FrameMaker format?
by Brad Clements 15 Jan '99

15 Jan '99

'tis a silly question, I know. 1. I thought someone on this list said the PMG, DHTML and Aquaduct guides were in framemaker format. 2. Html too ugly 3. PDF, well that's ok, except I want to print four up on a sheet, and the only way I can do that is with ClickBook, which does not work with Acrobat very well. The fonts used in the .pdf come out in funny circles and squares.. So, if I could get the docs in frame .mif, .fm, or .doc format (I have FrameMaker 5.5) I'd be a happy person 'cause I could then just print directly from Frame through clickbook to 4-up sheets. Am I asking too much? Brad Clements, bkc(a)murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax netmeeting: ils://ils.murkworks.com ICQ: 14856937 We must come down from our heights, and leave our straight paths, for the byways and low places of life, if we would learn truths by strong contrasts; and in hovels, in forecastles, and among our own outcasts in foreign lands, see what has been wrought upon our fellow-creatures by accident, hardship, or vice. - Richard Henry Dana, Jr. 1836

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- FYI: Zope listed in LWN
by Paul Everitt 15 Jan '99

15 Jan '99

Zope has a section in: http://lwn.net/1999/0114/devel.phtml --Paul

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- Ugh. Missing __doc__ causes major headaches
by Gabe Wachob 15 Jan '99

15 Jan '99

I spent a few stupid hours tracking this down... ZPublisher will complain that a "document cannot be found" if a method being referred to in a URL does not have a doc string (ie __doc__ or the ''' ...''' at the beginning of the method definition). Now, I remember reading something about this (doc strings required to make Bobo objects published) in the Bobo documentation back when bobo was the new hot thing, but it took me several hours to realize this was the problem tonight. I didn't see this mentioned in the Zope dox, and it had completely slipped my mind. Of course, now that I've found the problem, I see where its mentioned in the ORB Documentation. Someone might want to highlight this somewhere (a FAQ?). I was thinking a Product "Checklist" would be very useful. Also, examples of Folderish items... I ended up figuring out tonight's problem by following the stack trace and seeing that a missing __doc__ string causes the misleading (causing me a lot of my lost time) "document cannot be found" message. I noticed that there was a debug flag that would have probably gotten me to the problem quicker -- how do I turn that on? Anyway, I'm very happy to finally be able to make some forward progress and i hope to have my little XML/XSL product working soon! -Gabe

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- Testing for query variable existance in dhtml
by Brad Clements 15 Jan '99

15 Jan '99

I have a document that is called with or without a query value. http://myhost/mydocument?list=thislist or http://myhost/mydocument What's the best way to determine if list is defined in the request? I tried  That didn't work, either with or without quotes Also, whats the correct way to determine if list points to a valid object, I tried this.    This seems to work if list is pointing to a valid object, but I get "Sorry, Zope is offline" error if list is an invalid object name. What I really want to know is if list names something IN the current Folder that contains the current document.. Any suggestions? Could I use  ?? Thanks Brad Clements, bkc(a)murkworks.com (315)268-1000 http://www.murkworks.com (315)268-9812 Fax netmeeting: ils://ils.murkworks.com ICQ: 14856937 We must come down from our heights, and leave our straight paths, for the byways and low places of life, if we would learn truths by strong contrasts; and in hovels, in forecastles, and among our own outcasts in foreign lands, see what has been wrought upon our fellow-creatures by accident, hardship, or vice. - Richard Henry Dana, Jr. 1836

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- XMLFile Product
by Gabe Wachob 15 Jan '99

15 Jan '99

I put together a simple XML/XSL Product. It contains an XML file and an XSL file, lets you edit or upload either, and renders the XML into HTML with the XSL using an external XSL engine (no XSL processor in Python yet -- maybe thats my next big project...). Further input appreciated! You can get the file off of http://www.aimnet.com/~gwachob/software.html -Gabe

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Re: [Zope] - How to register an object?
by Amos Latteier 14 Jan '99

14 Jan '99

At 04:57 PM 1/13/99 -0500, Peter J Ulintz wrote: >Hi. >Could you take a minute and help me out? Sure, but I'm taking the liberty of ccing the Zope list so that hopefully others will profit. I hope you don't mind. >So I'm trying to publish an object in the Zope framework. >Here's the object > >person.py: >----------------------------------------------------------- >import DocumentTemplate > >class Person: > "A simple person" > def __init__(self, name): > self.name = name > > index_html=DocumentTemplate.HTMLFile("my_template.dtml") >------------------------------------------------------------ > >The "my_template.dtml" file is exactly the same as in the "Techical >Introduction to Object Publishing" document. Now, I want to publish the >object in the Zope heirarchy using an External Method. I used... > >import_person.py: >----------------------------------------------------------- >import person > >def add_person(self, name = 'John Doe'): > """This method is called by a folder to add a person""" > person=person.Person(name) > if not hasattr(self, name): > setattr(self, name, person) > return "Person added to folder" >----------------------------------------------------------- In general what you are doing is right--creating an objects and installing it in the object hierarchy. Unfortunately, there is a subtle problems with this. The problem is that your person object cannot be stored in the object database since the External Method machinery makes the Person class hard to unpickle. If you were creating Zope objects, or if the Person class existed somewhere else, like in the Shared module, this approach would work. I believe this limitation is mentioned in the External Method documentation. >So, I create an External Method-- ID: addPerson Title: Add Person >Function Name: add_person Python module file: import_person >This creates an external method object in my Zope folder called >"addPerson". If I now go to the browser and type(I'm using the >ZopeHTTPServer)... > >http://141.214.57.234:9673/addPerson?name="Geddy" OK, here's another problem. No need for quotes around Geddy. In fact those quotes are going to cause you problems. >...I get the response, "Person added to folder". But I'm not sure what's >SUPPOSED to happen here. Is the object supposed to magically appear in >the folder? What am I doing wrong? Just typing: >http://141.214.57.234:9673/addPerson >works, but typing >http://141.214.57.234:9673/addPerson?data="bullocks" >gives the same "Person added to folder" message. OK, Zope is doing exactly what you are telling it to do. It is creating an object, installing it in a folder and returning a message. I'm not sure what else you want ;-) If you want a Zope object to appear in the management interface after this, you need to install a Zope object, not just a random object. For an object to be manageable through the web with Zope's interface it must support the Zope Product API. Also installing a Zope Product in a Folder should in general be accomplished with the '_setObject' method, not a plain old 'setattr'. >How do I publish an actual "Geddy" person object, that I can call the >index_html attribute on? Oh, following your suggestion (and the one in >the External Methods documentation on the site), creating a file OK, the essential functioning of the Zope ORB is to allow you to use URLs to traverse the object hierarchy. So if you call myFolder/addperson?data=duke Then your External Method will add an attribute named 'duke' to 'myFolder'. Therefore you should now be able to access this attribute like so myFolder/duke Make sense? To publish an object you point your browser at its URL. >import_person2.py: >-------------------------------------------------------------- > >import person > >def addPerson(self, name='Dufus'): > "return person" > return person.Person(name) >------------------------------------------------------------- > >Trying the same thing gives a "Sorry, th requested document does not >exist" error. The page source doesn't really tell me much there. Ouch! My bad! This method does not *publish* a Person instance, it *returns* a Person instance as a response. So Zope tries to understand the instance as a string and decides that it is not a valid response. (Actually viewing the source of the error page should give you some information about what went wrong. That's how I discovered my mistake.) To actually publish an object, it must be part of the object hierarchy so that Zope can traverse it. Let me give a good example here: The first thing we'll do is create a module to hold our publishable classes. Lets create our own package inside the Shared package. Create a directory inside lib/python/Shared named PeeWee (or use your own name). Next create an empty file __init__.py inside the PeeWee directory. This lets Python know that PeeWee is a package. Now let's create a Python file, PlayHouse.py inside the PeeWee directory. class PlayHouse: "Play house" def index_html(self,game='tag'): "publish the playhouse" return "In the play house we play %s." % game OK, now we have a publishable class that is Zope accessible. Now we need to get an instance of that class into the object hierarchy. Let's use an external method. Create a Python file in Extensions named peewee_utils.py from Shared.PeeWee.PlayHouse import PlayHouse def addPlayHouse(self,id): "Add a playhouse to the current folder" if not hasattr(self,id): setattr(self,id,PlayHouse()) return "playhouse added with id %s" % id else: return "id %s already in use" % id Now create an External Method object to give us access to the addPlayHouse method. Suppose we give our External Method the id 'addPlayHouse', and tell it to use the 'addPlayHouse' method of the 'peewee_utils' module. OK, now we can call our method and install a publishable object in the Zope object hierarchy. myFolder/addPlayHouse?id=myHouse This should return "playhouse added with id myHouse". What the method did was create a PlayHouse instance and make it an attribute of the myFolder object. Now we can access the PlayHouse like this: myFolder/myHouse?game=hide+and+seek Which should return "In the play house we play hide and seek." Note that you will not see any PlayHouse object in the management screen. This is because it is not a Zope Product. However, you can indirectly sense that it is there--if you try to create a Document with id 'myHouse' you will be told that 'myHouse' is already in use. I hope this helps. (I'll update the docs on the Zope site.) >Lastly, trying your External Objects product, and importing the "Person" >object from the person.py, creates on External Object in the Zope folder. >Directing my browser to that brings up the folder's index_html page, no >matter what I put as an arguement. How do I use that? The External Object Product is a container for externally defined publishable objects. You need to tell the External Objects Product the names of the objects you want to publish and the module they reside in. So for example if you define an object 'person' in a module 'Person' in the Extensions directory you need to let External Objects know these facts. Once you have configured your External Object object, access the external objects as sub-objects of the External Objects object like so: myExternalObjects/myObject Note: your published objects may contain further sub-objects. Hope this helps. Object publishing takes a little while to grasp. Don't give up! -Amos P.S. A final note of advice. If you are just learning object publishing--I would advise not trying to plug your objects into the Zope framework right away. Try publishing your own modules with ZopeHTTPServer.py. Get a feel for how to composite objects and how they map to URLs. Then figuring out how to get your objects to play in the Zope framework will make more sense.

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