Thank you Ilya,
What you said make a lot of senses.
On Sunday, March 8, 2015 at 10:36:27 PM UTC-3, Ilya Kazakevich wrote:
>
> There are 2 types of Apps in Django:
> 1) reusable one with clear, documented interface
> 2) not reusable one, because it depends on current project heavily.
>
> Ideally, project consists of several reusable-apps, and project-specific
> data is stored in project-specific places like URLConf or filesystem
> templates.
> But in real life, project may have one or more non-reusable app tied to
> this project heavily. If you have app with specific business-logic you do
> not want to share it. If you have app with generic logic (forum, shop,
> email system, template engine, orm system, new field type, a pack of tags
> etc) -- you need to make it shareable.
>
> It is like modules in python: you have reusable packages and modules, but
> you almost always have "yourfile.py" script which is not reusable. But you
> should do your best to make this file as small as possible by making most
> of your code reusable and moving it to sharable packages and modules.
>
> Actually, this is not only about Python: in OSes you have execution binary
> and .so files (if you are *nix user) or .exe file and .dll files (if you
> are windows user).
> .so/.dlls are reusable, but .exe (or executable) is not.
>
> I think you should start with 4 apps:
> 1) user management
> 2) business logic (models and other staff used both in front-end and
> back-end)
> 3) front-end with front-end specific code
> 4) backend with back-end specific.
>
> Back and front may depend on business, but not on each other, and business
> does not depend on anything.
> You should be able to throw backend away, and totaly rewrite it, and be
> sure front-end and business logic is not affected.
> Speaking in MVC term here, your business is Model, and Front and Back are
> both views. You may even need to create some new view, like portal which is
> not frontend nor backend,
>
> You then try to fetch some "generic" parts from you apps. For example you
> may find that you use views/templates/tags to display some business data in
> fancy way. You may move it to business-logic part, to share between
> front-end and back-end.
> Or you may find that you just created, say, email blast engine, or report
> engine, that can be used even with out of your business logic, in totaly
> different project! You then move it to separate app, and make it public to
> reuse in other projects.
>
> Splitting code into modules (units, packages) is one of the hardiest
> things in software architecutre. It is ok to refactor existing projects
> changing modules structure, because you never know if your layout is good
> until you try to support such project.
>
> Ilya.
>
> On Sunday, March 8, 2015 at 9:56:51 PM UTC+3, Gabriel Klein wrote:
>>
>> Hi there,
>>
>> I'm going to start a big project using Django.
>> It will have 3 main sections:
>>
>> - A "Frontend" section:
>> Where the user will consult the data.
>> - A "Backend" section:
>> Where the ETL and Admins will organize the data
>> - A User Management section:
>> Where I'll manage user permission, Oauth for my APIs
>>
>> I'm aware that Django recommend to break down your project into a
>> multitude of apps with a very small scope.
>> While my User Management section should be simple enough to be on his own
>> app my two other sections "Frontend" and "Backend" come with a fairly
>> complex snowflake schema (about 15 tables) and sometime with cross
>> dependencies between apps. They also come with complex business logic that
>> can be break down to smaller apps.
>>
>> My question is how to shared models across apps?
>> I was thinking creating a app only to cary my complex models?
>>
>> This app can be now reuse within smaller app doing backend or fronted
>> jobs.
>>
>> Any advice will be welcome.
>>
>>
>>
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