On 01/13/2016 12:37 AM, Jonathan Rogers wrote:
> I have several domains based on type TEXT to constrain values in
> specific ways, such as to disallow empty values or only allow valid
> email addresses. When I reflect tables with columns of such a domain,
> SQLAlchemy simply considers their types to be TEXT. Is there any way to
> make the domains known to SQLAlchemy so that it can treat them as
> distinct types? My goal is to define a new table with nearly identical
> structure to an existing one, adding some columns in the process. I
> looked over
>
>
> "Custom Types" in the manual but I wasn't sure where to start. Would I
> be creating an entirely new type or augmenting an existing one?
This is a Text subtype so I'd have TEXT in the superclass, the @compiles
approach can be used to give it its DDL:
from sqlalchemy.types import TEXT
from sqlalchemy.ext.compiler import compiles
class MyType(TEXT):
pass
@compiles(MyType)
def _mytype(elem, compiler, **kw):
return "MYTYPE"
>
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