Diary of a wannabe ZOPISTA - Day 4
Hello All, this is my debut on this list. From watching it for the last couple of days it seems to be a very active community. I've spent the last 3 days immersed in ZOPE and ZOPE documentation, last night my dreams were full of ZOPE objects interatcting with one another. Whilst reading ZCMG and following along with the examples I came across something that is either a mistake or completely throws into question everything that I thought I had learnt about acquisition. The example occurs in the Chapter "Zope Applications and Products" in the first section "Creating Zope Applications using DTML scripts". Home the example is available online at: http://www.zope.org/Documentation/Guides/ZCMG-HTML/ZCMG.4.1.html In the example 'Stan' has made the following directory structure root |_ZAcme |_Products | |_Research | |_News In the Products folder he creates a DTML Method, index_html which is as follows: <dtml-var standard_html_header> <dtml-var logo> <H2><dtml-var company_name></H2> <dtml-var message> <HR> For more information, contact us at <em> <dtml-var contact_phone></em> <dtml-var standard_html_footer> All simple stuff. The method uses 5 properties on top of the standard header and footer which are defined in the root folder. In the example Stan goes on to create a folder 'Home' which is a sub-folder of 'Products' root |_ZAcme |_Products | |_Home | | |_Research | |_News 'Stan' then gives the 'Home' folder the 5 properties that are required by the index_html DTML method. In the example acquisition takes care of this and the DTML method works. When I code it, it doesn't work. Moreover this upsets my (primitive) understanding of acquistion which is that the index_html can only acquire properties from objects 'up-stream' in the path. As soon as I move the index_html page into the 'Home' folder everything works. The problem is that the file index_html accesses properties of a folder that is in the same level of the path as itself. My (primitive) understanding of acquistion says that the index_html can only acquire properties from objects 'up-stream' in the path. This is born out by the example not working for me when I try it as described. As soon as I move the index_html page into the 'Home' folder everything works. Shouldn't the properties belong the 'Products' folder? Or is it that I have misunderstood the example and typed something wrong? As a separate question. I keep repeating to myself "It's all about objects. Objects have sub-objects, properties and methods". Every now and then I have an epiphany and the clouds clear and I get a glimpse of the grand design that is ZOPE and I feel that I get a step closer to being productive in ZOPE. One of the first of these was realising that DTML methods are exactly that: METHODS of the folder that they belong to. In that case in OOP terms what are DTML documents to the folder that they reside in? Are they properties of the folder? TIA Jethro
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Jethro Cramp