Changes between Version 75 and Version 76 of IrcFAQ


Ignore:
Timestamp:
May 5, 2008, 8:18:51 AM (17 years ago)
Author:
Paul Bissex
Comment:

reorganized media questions

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  • IrcFAQ

    v75 v76  
    8282You can learn more about Python's handy profiling tools in the [http://docs.python.org/lib/profile.html Python documentation].
    8383
    84 = How to do Stuff = #HowTo
    85 
    86 == How do I create a subclass of an existing model? == #ModelInheritance
    87 
    88 Model inheritance (aka model subclassing) is available in Django trunk as of r7477.
    89 
    90 If you're using it, make sure you've [http://www.djangoproject.com/documentation/model-api/#model-inheritance read the documentation] and understand the difference between '''abstract base class''' and '''multi-table''' inheritance options. The latter can be confusing to newcomers because an instance of a parent class will also contain, on an attribute named after a child class, that same object represented as an instance of the child class. Got that?
    91 
    92 An established mechanism for adding additional information to Django `User` objects without subclassing is known as  "profiles"; you can [http://www.djangobook.com/en/1.0/chapter12/#s-profiles read about it in the Definitive Guide].
    93 
    94 For an important alternatve viewpoint on model subclassing, see: http://www.b-list.org/weblog/2007/02/20/about-model-subclassing
    95 
    96 == I think Ajax is awesome! How do I do Ajax with Django? == #Ajax
    97 
    98 Choose your favorite excellent Javascript library and go to it. Django provides serializers to JSON and XML, which you can read about in the documentation: http://www.djangoproject.com/documentation/serialization/
    99 
    100 Also see this helpful article from James Bennett (with bonus anti-Javascript-helpers rant!): http://www.b-list.org/weblog/2006/07/02/django-and-ajax
    101 
    102 == How do I customise the admin interface so all logged-in users can use it without screwing up anything? == #AllUsersAdmin
    103 
    104 The admin interface is designed for use by trusted site staff, not by any user -- if you don't trust a user with the level of access the admin application provides, you'll need to provide non-admin views for the actions you'd like to allow them to take.
    105 
    106 == How do I make extensive changes in the admin interface? == #ExtensiveChangesAdmin
    107 
    108 At the moment it's probably best not to; the admin app is fairly specialized and doesn't have a lot of places to customize behavior, so you'll usually end up writing less code by just rolling your own set of views. The [http://code.djangoproject.com/wiki/NewformsAdminBranch newforms-admin branch], however, is significantly chanaging the admin app's interfaces to make customization much simpler and more flexible.
    109 
    110 For less extensive changes, also see the documentation in [http://www.djangobook.com/en/1.0/chapter17/ The Definitive Guide to Django].
    111 
    112 == I want to have some code run when the server/application starts. How do I do that? == #ServerStartup
    113 
    114 Both mod_python and FastCGI are structured in such a way that there's no such thing as "application startup" or "server startup"; the best solution is to place your "startup" code somewhere that's guaranteed to be imported early on in the request/response cycle (the `__init__.py` file of your project, or of a specific application you're using, can be a good place, because Python will execute code found there the first time it has to import the module; just be aware that referencing the same module in different ways, say by doing `from myproject.myapp import foo` in one place, and `from myapp import foo` in another, will cause that code to be executed once for each different way you import it).
    115 
    116 == Do I have to hard-code my media URL in all my templates for CSS, images and Javascript? == #MediaURL
    117 
    118 No; you can use {{ MEDIA_URL }}. If you're using the development version of django and generic views, you can use {{ MEDIA_URL }} without changing anything.
    119 
    120 If you're using the development version and render_to_response(), you'll have to include RequestContext, as described here: http://www.djangoproject.com/documentation/templates_python/#subclassing-context-requestcontext
    121 
    122 If you're using 0.96, you can get the same functionality by creating a template context processor, as described: http://www.b-list.org/weblog/2006/jun/14/django-tips-template-context-processors/
    123 
    124 
    125 == How do I use Django in a shell script? == #Shell
    126 
    127 http://www.b-list.org/weblog/2007/sep/22/standalone-django-scripts/
    128 
    129 == Can I use the Date/Time picker !JavaScript from the Admin in my own app? == #DatePicker
    130 Short answer: No.
    131 
    132 Long answer: It is possible, but requires reusing the Admin JS and CSS, and is more trouble than it is worth. Most !JavaScript frameworks (such as [http://developer.yahoo.com/yui/ YUI], [http://dojotoolkit.org/ Dojo], [http://jquery.com/ jQuery], and [http://www.prototypejs.org/ Prototype]) provide similar functionality, either out of the box or through plugins. Additionally, there are many !JavaScript snippets available across the Web.
    133 
    134 == I want to repeat a bit of dynamic information (eg from a database) on many views. Do I have to change every view? ==
    135 
    136 No, you can use an [http://www.djangoproject.com/documentation/templates_python/#inclusion-tags inclusion tag].
    137 
    138 == If I change my model, will {{{manage.py syncdb}}} update my database table? == #ModelChanges
    139 
    140 No, you'll need to manually change your database table. If you use `manage.py sqlall` on your app to produce a SQL file before editing your models, you can run it again afterwards and use the difference between the two to see what you need to change in the database.
    141 
    14284
    14385
    … …  
    164106Also, when reading the documentation, keep a special eye out for the "New In Development Version" sections.
    165107
    166 == The admin is working, but it can't find the Javascript and CSS and image files. == #AdminFiles
     108== My media/static files (CSS, images, etc.) aren't showing up. == #MediaTroubles
     109
     110Django doesn't serve static media automatically (except for the admin, which has special code to handle this).
    167111
    168112If you're running the development server, read this: http://www.djangoproject.com/documentation/static_files/
    … …  
    170114If you're running Apache, read this: http://www.djangoproject.com/documentation/modpython/#serving-media-files
    171115
     116Confusingly, though the {{{MEDIA_*}}} settings in your settings.py file refer to ''your'' media files, not the Admin app's media files,  the default path for Admin app media ({{{ADMIN_MEDIA_PREFIX}}}) is set to "/media/". Many Django users change this to "/admin_media/" or "/adminmedia/" to reduce potential confusion.
    172117
    173118== Why isn't my template tag or filter working? == #TemplateTagsAndFilters
    … …  
    208153
    209154
     155= How to do Stuff =
     156
     157== How do I create a subclass of an existing model? == #ModelInheritance
     158
     159Model inheritance (aka model subclassing) is available in Django trunk as of r7477.
     160
     161If you're using it, make sure you've [http://www.djangoproject.com/documentation/model-api/#model-inheritance read the documentation] and understand the difference between '''abstract base class''' and '''multi-table''' inheritance options. The latter can be confusing to newcomers because an instance of a parent class will also contain, on an attribute named after a child class, that same object represented as an instance of the child class. Got that?
     162
     163An established mechanism for adding additional information to Django `User` objects without subclassing is known as  "profiles"; you can [http://www.djangobook.com/en/1.0/chapter12/#s-profiles read about it in the Definitive Guide].
     164
     165For an important alternatve viewpoint on model subclassing, see: http://www.b-list.org/weblog/2007/02/20/about-model-subclassing
     166
     167== I think Ajax is awesome! How do I do Ajax with Django? == #Ajax
     168
     169Choose your favorite excellent Javascript library and go to it. Django provides serializers to JSON and XML, which you can read about in the documentation: http://www.djangoproject.com/documentation/serialization/
     170
     171Also see this helpful article from James Bennett (with bonus anti-Javascript-helpers rant!): http://www.b-list.org/weblog/2006/07/02/django-and-ajax
     172
     173== How do I customise the admin interface so all logged-in users can use it without screwing up anything? == #AllUsersAdmin
     174
     175The admin interface is designed for use by trusted site staff, not by any user -- if you don't trust a user with the level of access the admin application provides, you'll need to provide non-admin views for the actions you'd like to allow them to take.
     176
     177== How do I make extensive changes in the admin interface? == #ExtensiveChangesAdmin
     178
     179At the moment it's probably best not to; the admin app is fairly specialized and doesn't have a lot of places to customize behavior, so you'll usually end up writing less code by just rolling your own set of views. The [http://code.djangoproject.com/wiki/NewformsAdminBranch newforms-admin branch], however, is significantly chanaging the admin app's interfaces to make customization much simpler and more flexible.
     180
     181For less extensive changes, also see the documentation in [http://www.djangobook.com/en/1.0/chapter17/ The Definitive Guide to Django].
     182
     183== I want to have some code run when the server/application starts. How do I do that? == #ServerStartup
     184
     185Both mod_python and FastCGI are structured in such a way that there's no such thing as "application startup" or "server startup"; the best solution is to place your "startup" code somewhere that's guaranteed to be imported early on in the request/response cycle (the `__init__.py` file of your project, or of a specific application you're using, can be a good place, because Python will execute code found there the first time it has to import the module; just be aware that referencing the same module in different ways, say by doing `from myproject.myapp import foo` in one place, and `from myapp import foo` in another, will cause that code to be executed once for each different way you import it).
     186
     187== Do I have to hard-code my media URL in all my templates for CSS, images and Javascript? == #MediaURL
     188
     189No; you can use {{{{{ MEDIA_URL }}}}}. If you're using the development version of django and generic views, you can use {{{{{ MEDIA_URL }}}}} without changing anything.
     190
     191If you're using the development version and render_to_response(), you'll have to include RequestContext, as described here: http://www.djangoproject.com/documentation/templates_python/#subclassing-context-requestcontext
     192
     193If you're using 0.96, you can get the same functionality by creating a template context processor, as described: http://www.b-list.org/weblog/2006/jun/14/django-tips-template-context-processors/
     194
     195
     196== How do I use Django in a shell script? == #Shell
     197
     198http://www.b-list.org/weblog/2007/sep/22/standalone-django-scripts/
     199
     200== Can I use the Date/Time picker !JavaScript from the Admin in my own app? == #DatePicker
     201Short answer: No.
     202
     203Long answer: It is possible, but requires reusing the Admin JS and CSS, and is more trouble than it is worth. Most !JavaScript frameworks (such as [http://developer.yahoo.com/yui/ YUI], [http://dojotoolkit.org/ Dojo], [http://jquery.com/ jQuery], and [http://www.prototypejs.org/ Prototype]) provide similar functionality, either out of the box or through plugins. Additionally, there are many !JavaScript snippets available across the Web.
     204
     205== I want to repeat a bit of dynamic information (eg from a database) on many views. Do I have to change every view? ==
     206
     207No, you can use an [http://www.djangoproject.com/documentation/templates_python/#inclusion-tags inclusion tag].
     208
     209== If I change my model, will {{{manage.py syncdb}}} update my database table? == #ModelChanges
     210
     211No, you'll need to manually change your database table. If you use `manage.py sqlall` on your app to produce a SQL file before editing your models, you can run it again afterwards and use the difference between the two to see what you need to change in the database.
     212
     213
    210214
    211215= Resources, Tools, and Code = #Resources
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