forms.py 文件源码

def formClassFactory(name, model, baseclass):
    ''' Generates a new WTForm class based on SQLalchemy model class.  Each class contains as attributes
        Meta = a class called Meta.  Meta.model contains the SQLalchemy ModelClass
        data = a dictionary of parameters: form input that gets mapped to the sqlalchemy parameter
        errors = a dictionary of errors returned by invalid form validation
        validate = a method to validate all elements in this form
        parameter_X = a WTForm Field mapped to respective sqlalchemy table column

        e.g.
        The ModelClass IFUDesign mapped to mangadatadb.ifu_design sql table gets transformed into
        WTForm IFUDesignForm, with IFUDesignForm.Meta.model = marvin.db.models.DataModelClasses.IFUDesign
    '''

    Meta = type('Meta', (object,), {'model': model})
    newclass = type(name, (baseclass,), {'Meta': Meta})
    return newclass

# build a wtform select field for operators; tested but no longer used ; can't seem to attach operator field to every individual parameter