- Zope - Zope lists

- RE: Zope programming idioms
by Jeff Bauer 18 Dec '98

18 Dec '98

>> This doesn't feel right, however [snip] but there must >> be a more natural way to: >> >> dtml -> object method -> dtml -> whatever > Hmm, it looks alright to me, I'm not sure what the > problem it. > > Maybe it the '-> whatever' bit. I don't understand that > part of the flow. By 'whatever' I meant that it might return a document or invoke another object method that returns a document or invokes another object method or ... whatever. > In general I write methods that should be accessed from > the web the same way as you do: Then I must be doing something right <wink>. > def spice(self,salt,pepper,REQUEST=None): > "spice the meal" > ... > if REQUEST is not None: > return self.some_dtml_class_attribute(self,REQUEST, > message="meal successfully spiced") > > If there is no need to specifically confirm the spicing > operation, you could return a different method, like > index_html, the PARENT's index_html, or manage_main, etc. > depending on context. Okay, just getting independent confirmation that I'm not totally off-base helps. Or at least I'm in good company. At any rate, the round-trip nature of dtml to object methods to dtml to whatever probably makes useful how-to fodder. How will the proposed JimF changes to DocumentTemplate affect this idiom? Best regards (and thanks) Jeff Bauer Rubicon, Inc.

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- RE: Zope programming idioms
by Amos Latteier 18 Dec '98

18 Dec '98

Jeff Bauer wrote: >Here's a question for the HowTo, now all it requires >is an answer :-) > >Seriously, my question is more Bobo related than Zope >material, so I don't know how appropriate this is, but >I think it will be easy to answer. > >---------------------------------------------------------------- >assessment_app.py: > > confirm_html = DocumentTemplate.HTMLFile(dtml + "confirm.dtml") > > def assessment_validate(self, RESPONSE=None): > """assessment validation""" > # do some really important work here ... > if RESPONSE is not None: > msg = "Some important message" > return self.confirm_html(message=msg) >---------------------------------------------------------------- > >Let's say I have a DocumentTemplate, new_assessment.dtml, >and it's form submit method calls "assessment_validate". > >When the form is submitted, assessment_validate is >called as expected. The confirm_html document is >explicitly called by assessment_validate with the >arguments manually pasted in. This doesn't feel right, >however. I'm not sure that I want to do a redirect, but >there must be a more natural way to: > > dtml -> object method -> dtml -> whatever Hmm, it looks alright to me, I'm not sure what the problem it. Maybe it the '-> whatever' bit. I don't understand that part of the flow. In general I write methods that should be accessed from the web the same way as you do: def spice(self,salt,pepper,REQUEST=None): "spice the meal" ... if REQUEST is not None: return self.some_dtml_class_attribute(self,REQUEST, message="meal successfully spiced") If there is no need to specifically confirm the spicing operation, you could return a different method, like index_html, the PARENT's index_html, or manage_main, etc. depending on context. If you wanted to you could just have some generic status method that would display the object's current status. Then you could return this method after each invocation of a method that might change the object's state. Figuring out which links to return from methods is a tricky business, and maybe is more fit for a user interface designer than a programmer. However, I seldom find it necessary to redirect the request. I guess it could be necessary if a method creates a new object, and you want to display a method of that object. But then again, you could just call a method on the object and return that... I think the only difference between the two would be the URL displayed and the BASE. Does this answer your question? -Amos

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- ANN: Zope 1.9b3 released
by Amos Latteier 17 Dec '98

17 Dec '98

Hello: Not content with a release every 7 days, this time we've released a new beta in only 6 days ;-) http://www.zope.org/Download/ The main new feature is this beta is the inclusion of SQL Methods. Unfortunately we were only able to finish up the gadfly database adapter by release time. Look for more adapters to appear in the next week starting with MySQL. Also from here on out you should use the Bugs and Features database to submit bugs. http://www.zope.org/Collector/ Hopefully the new bugs database will help us more efficiently identify and fix bugs. <HINT>It can also be used to check if a bug has already been reported.</HINT> Enjoy. -Amos

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- BoboPOS problems
by Pavlos Christoforou 17 Dec '98

17 Dec '98

Hello Zopistas I created an extension (a hit counter) that includes the class definition in the same source file as the method. After a couple of days ZopeHTTPServer crashed without any apparent reason. On restarting I got the following errors in the server.log file: Traceback (innermost last): File "serve.py", line 99, in ? ZopeHTTPServer.main(args) File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 456, in main start(module_file,host,port,threading,env) File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 405, in start set_published_module(module_file,BoboRequestHandler,env) File "/home/pavlos/Zope-1.9.0b2-src/ZopeHTTPServer/ZopeHTTPServer.py", line 401, in set_published_module __import__(name) # to catch problem modules right away File "/home/pavlos/Zope-1.9.0b2-src/lib/python/Main.py", line 103, in ? Bobobase=OFS.Application.open_bobobase() File "/home/pavlos/Zope-1.9.0b2-src/lib/python/OFS/Application.py", line 319, in open_bobobase app._setObject('Control_Panel', cpl) File "/home/pavlos/Zope-1.9.0b2-src/lib/python/BoboPOS/PickleJar.py", line 261, in setstate state = unpickler.load() SystemError: Failed to import class Counter from module __main__ As I understand the problem has to do with pickle not finding the class definition. I assume that the External methods object uses exec to load and store only the function definition into Zope/BoboPOS and not any other code that finds in the source file. I hacked Main.py and included a from Counter import Counter but it did not work. So now I am stuck without Zope :-( Also the change was made 2 days ago and all objects from there on include refrences to the counter object. Am I missing something simple or have I messed things up badly? Pavlos

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- Zope site new features
by Amos Latteier 17 Dec '98

17 Dec '98

Hi: I just wanted to let you all know that the Zope site is slowly but surely gaining more useful content. Here's a list of some new stuff: - Support area which contains a troubleshooting guide with common problems and solutions. - Bugs and Features database which allows you to view submitted bugs and their status. You can also use it to submit feature and documentation requests. - Documentation is getting reorganized, and now includes a How-To collection with recipes for common or interesting Zope tasks. There's lots more on the way. You can help by pointing out problems, and suggesting new directions. Also, if you figure out how to do something cool or useful, consider writing a couple paragraphs and I'll add it to the How-To collection. Thanks. -Amos

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RE: [Zope] - Personalization and ZOPE
by Paul Everitt 17 Dec '98

17 Dec '98

Theodore wrote: > How would one go about making Zope store personal data about > a site visitor > (Session to Session data linked by a user logon)? > > SCENARIO: > > 1. The user logs on and registers. ...and goes into a User Folder somewhere. We have done some work on getting cookie-based authentication to work. > 2. The user fills out forms to customize the site as part of the > registration process. ...and gets an email, and has a facility to remember lost login information, and gets expired after a certain time period, and... Since they are going to want to change their personalization options over time, they need a place to come back to. > 3. The site uses the user variables to make the navigation, > content and > graphic changes. > 4. If the user edits the variables the site changes. > 5. The developer gets some sleep by using zope. > > ANY RECOMMENDATIONS? > > IT WOULD MAKE FOR AN EXCELLENT EXAMPLE OF ZOPE! Except for the cookie part, this shouldn't be too hard for you to tinker with. Modify the User class in User.py to have other state then change addUser.dtml and editUser.dtml to make it visible. After that, add some methods to allow the information to be seen in DTML. For instance, if you added the following method to User (UNTESTED!): def getExperienceLevel(self): """Return whether the person is novice, intermediate, or advanced.""" return self.experience_level then in DTML you could say:  <p>The words with the funny blue lines under them are called hyperlinks.</p>  --Paul Paul Everitt Digital Creations paul(a)digicool.com 540.371.6909

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RE: [Zope] - Template Question
by Paul Everitt 17 Dec '98

17 Dec '98

Roy wrote: > Anyone know how templates are established and inherited? Templates objects can be created in a number of ways. Programmers can add class attributes that read a .dtml file off disk and create a template instance as a class attribute. For instance, the entire Zope management screen is written this way. 'main','manage_menu','manage_main','manage_addDocumentForm' etc are all examples. Content managers can use the web interface to create Zope Document objects that are stored in the database. As for inherited, the actual word is "acquired". Inheritance follows a "is-a" hierarchy. Acquisition follows an "in-a" hierarchy. For the theoretical background on acquisition, check out: http://www.digicool.com/releases/ExtensionClass/Acquisition.html In practice, this means things in parent folders for which you have permission can be used by things lower down. standard_html_header is an example. It is defined in the top folder and reused by child folders, *unless* a standard_html_header is defined in between. > standard_html_header and standard_html_footer seem to be > "defaulted" into > each newly created index.html. Is there a way to set what > template data > gets inserted into each newly created document? Can this be > set globally as > well as locally (folder level)? There are a couple of facilities for doing this that haven't been documented well and/or finished. The first is the Lever. It allows you to package up a whole bunch of objects and install them into the Control Panel as a new kind of thing that can be added. Thus, you might create a Folder with five Documents in it, including a local_html_header. The Documents might point to local_html_header instead of standard_html_header. Once it is installed into the Control Panel, average users see a new option in the add list. A deeper idea that we need to finish up is Zope Classes. This is similar to the Lever, in that you package up things and install them into the Control Panel. However, when new things are made, they retain their connection to the Control Panel. You could thus have central control over local_html_header by going to the Control Panel and managing its copy of the Document. The final option, of course, is to hack the source :^) --Paul Paul Everitt Digital Creations paul(a)digicool.com 540.371.6909

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- Template Question
by Roy Harvey 17 Dec '98

17 Dec '98

All -- Anyone know how templates are established and inherited? standard_html_header and standard_html_footer seem to be "defaulted" into each newly created index.html. Is there a way to set what template data gets inserted into each newly created document? Can this be set globally as well as locally (folder level)? Thanks, Roy Harvey

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- Personalization and ZOPE
by Theodore Patrick 16 Dec '98

16 Dec '98

How would one go about making Zope store personal data about a site visitor (Session to Session data linked by a user logon)? SCENARIO: 1. The user logs on and registers. 2. The user fills out forms to customize the site as part of the registration process. 3. The site uses the user variables to make the navigation, content and graphic changes. 4. If the user edits the variables the site changes. 5. The developer gets some sleep by using zope. ANY RECOMMENDATIONS? IT WOULD MAKE FOR AN EXCELLENT EXAMPLE OF ZOPE! Theodore E. Patrick Indigo Networks email: tpatrick(a)indigonetworks.com <mailto:tpatrick@indigonetworks.com> phone: 615-777-0070 ext.125

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- Serving Zope...
by Andy Smith 16 Dec '98

16 Dec '98

Hi All, I'd like to begin a thread on the list to try to gain a consensus as to what the needs of Zope users are w.r.t Web Servers. The DC guys, being understandably very busy at the moment, thought it might be preferable if someone else tried to elicit some opinions/feedback on the topic. A couple of issues that could be thrown into the mix ... o With ZopeHTTPServer supplied as part of Zope anyway, should support for Apache be that high a priority? o Does the average Zoper actually use the preconfigured Apache ... or does he/she use the installation to figure out how to configure an existing server. o How can pcgi be used to best effect? Would an apache mod_pcgi be useful? o How can Apache's proxy handler be leveraged to accomplish integration between it and Zope? o What are the security issues, both filesystem and authentication/encryption, that people are facing? o How can medusa be used to best effect? o Is anyone working on any Apache/Webserver related projects that may be relevant to the thread? o Would anyone *like* to be working on any Apache/Webserver related projects that may be relevant to the thread? ;) o [ Also insert 9,10,11... which are relevant but I've failed to include ] The purpose of this exercise will be to provide DC (and the Zope community at large) an idea of how people are currently accessing zope, what they want, where effort should be directed, and also where effort *is* currently being directed by the community, so as to avoid re-inventing wheels ;) The floor is open! Cheers, Andy.

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