Resolved by moving the method into the schema procedure file.
On Apr 28, 10:21 am, Paul Hemans <p_hem...@hotmail.com> wrote:
> Hi I am new to Python. I need to produce a simple query on the key
> field.
> exists = self.session.query(BILLS).filter(ID=="1")
>
> However, the process is running generically. That is the declarative
> table definitions are in the file schema.py and the table, field and
> value are determined at runtime. So what I have is the following ( I
> have omitted a bit of code for clarity) :
>
> class myClass():
> def import_data
> import schema
> # self.tableName defined elsewhere
> TI = eval("schema."+self.tableName+"()")
> exists = None
> for node in tupleNode.childNodes:
> for dataNode in node.childNodes:
> cValue = dataNode.data
> if node.tagName == self.keyField:
> #### Prob.
> # self.keyField is determined elsewhere
> exists = self.session.query(TI).filter(getattr
> (TI,self.keyField)==cValue)
>
> I get to the query and get the following message:
> Invalid column expression '<schema.BILLS object at 0x29DB7330>'
> Any help would be appreciated.
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