Web Component Development with Zope 3

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Web Component Development with Zope 3

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May be ex-library. Buy with confidence, excellent customer service!. Seller Inventory Xq. Seller Inventory X. Condition: New. New Book. However, the second time around, when trying to run the server for the application I had already built, I got the following error:.

Now, I am completely certain I had a working application when I last touched it. That said, I decided to start fresh with the instructions above. I checked out a fresh copy of Zope 3, reinstalled, and attempted to create a new instance. This is what I get when trying to run 'mkzopeinstance':.

Web Component Development with Zope 3 | SpringerLink

I honestly have no clue what's going on here. I'm beginning to think the SVN location above is incorrect, but there is absolutely no good information on Zope. Even the official 3. Unfortunately, the list of releases in the Zope 3 SVN project makes it quite hard to figure out what release is correct:. The Zope Management Interface is the default interface you see when accessing your application for the first time.

It goes without saying that this interface is incredibly intimidating to those who are using Zope 3 for the first time. Even after working with the interface a bit, I'm still not sure exactly what everything does, and why everything is there. This is an example where getting a monolithic package works against you, as a custom-assembled application can avoid using it entirely.

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That said, I'm sure everything is there for a reason. It'd be nice to have a more formal beginners documentation regarding exactly what everything in the ZMI does. Aaron Lehmann: The ZMI is intended to be a way to manage all of one's configurations through the web. It's a philosophical holdover from Zope 2. We don't use it much in Z4M, but it does allow quite a lot of options for through the web control. My biggest pet peeve with ZMI is that there's no way to log out of the application. I can successfully login using the credentials I provided when creating the instance, but there is no logout link anywhere.

After a few tries at guessing what the logout URL might be, it turns out that it is:. From Wikipedia:. It is included as part of the Zope web application server, but can also be used independently of Zope.

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Essentially, this means data is read and written from the database transparently through the use of Python objects, which also means there is no need for SQL. Unfortunately, this also means data portability is somewhat affected, since it's not as easy to import or extract data from ZODB at least, not apparently.

Aaron Lehmann: Non-trivial relational databases and the software that interfaces with them are almost invariably tightly coupled with the peculiarities of a particular RDBMS DB-specific languages for triggers, custom data types, SQL extensions, etc. The same can be said of ZODB or any other object database. The end result is that most migrations from any database to another will demand technical sophistication regardless of the database being used.

Web Components: The Secret Ingredient Helping Power The Web

Similarly, datamarting applications often denormalize their schema so that non-technical people can treat them as spreadsheets. The skill necesary to do that will also allow one to denormalize an ODB. One might argue that the RDBMS is still better, because it is what they use for non-technical report needs, but I think it's important to note that no programmer uses an unnormalized database for his code. There are many factors in choosing the best data storage technology for a particular system.

The decision often comes down to programming speed; ZODB lets Python programmers create native Python objects that persist between program restarts. It doesn't get much easier than that. Applications have static pages, so the first thing on our list is to serve a static page with our new Zope 3 application. Should be fairly straightforward. At this point, I'll turn over the mic to Benji, where he can walk you through the quick steps of how to get a static page up and running. Aaron Lehmann: I think it's worth mentioning that Zope 3 is not optimized with static pages in mind, but rather for applications, which may be published on the web.

In that context, the steps involved make code layering in an application much more straightforward. Really, if all you want to display is a static page, your best course is to use a more mainstream web server, such as Apache or Lighttp. The steps are quite simple, but it's not entirely apparent how exactly everything works. The most confusing part of the whole thing is the XML-based configuration files. In my opinion, using XML to manage the configuration for these objects rather than native Python configuration objects is not necessary.

This is a hot topic in the Zope 3 community. I'm not personally a fan of it, but less because of the fact that it's XML, than because a lot of the directives make too many assumptions and are too elaborate in their implementations. Of course, you don't have to use any of the ZCML if you don't want to. It's all based on Python underneath, and if you want to understand what it is hiding from you, you can do it yourself.

After I created the object using Benji's suggestions, I found that I had to somehow 'enable' the object. This is done by selecting the object from the left menu and then naming the object. When working with changes to your code, it should be noted that you need to restart the Zope 3 application server to reflect the new code.

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Aaron Lehmann: As a clarifying note here, the need for a restart only applies to code that is loaded at server start time, typically Python code. Templates generally get loaded dynamically either out of the database or off of the disk, and so do not suffer from this restriction.

A simple example:. Zope Corporation owns and maintains Zope4Media, which is based on Zope 3. While ZPT is fairly straightforward and easy to learn , it presents several problems.