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POWhere are the reference pages of the Google App Engine bulkloader transform?
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  1. POWhere are the reference pages of the Google App Engine bulkloader transform?
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    copied!<p>From an empty datastore, I was able to auto-generate a <code>bulkloader.yaml</code> file. It only contains the <code>python_preamble</code>, but the <code>transformers</code> section was empty.</p> <pre><code>python_preamble: - import: google.appengine.ext.bulkload.transform - import: google.appengine.ext.bulkload.bulkloader_wizard - import: my_own_transformers - import: data_models # This is where the SomeData class is defined. # some more imports here </code></pre> <p>Then based on the examples in the documentation, I need to define a property map for each of the columns in my CSV:</p> <pre><code>transformers: - kind: SomeData connector: csv property_map: - property: date import_transform: transform.some_undocumented_function </code></pre> <h1>Two Questions:</h1> <p>My understanding is that the function defined as the <code>import_transform</code> will transform the ordinary CSV string into a <a href="http://code.google.com/appengine/docs/python/datastore/typesandpropertyclasses.html" rel="nofollow">Property Class</a> worthy of the datastore. I want to understand how the transforms work, so I think I have two alternatives.</p> <ol> <li><p>Where is the library reference for <code>google.appengine.ext.bulkload.transform</code>? I want to know how to use <code>transform.some_undocumented_function</code>, as well as all the other <code>transform.some_other_undocumented_transformers</code></p></li> <li><p>You can see from my <code>python_preamble</code> that I <code>- import: my_own_transformers</code>. In that module, I defined a function <code>transform_date</code> that takes an ISO date string such as <code>2001-01-01</code> and transforms it into a type that can fit into <code>db.DateProperty()</code>. If my concept is correct, can I use:</p></li> </ol> <pre> property_map: - property: date import_transform: my_own_transforms.transform_date </pre>
 

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