Python Web2py CRUD.read（）通过非填充条件创建的记录

因此，我在Web2py中编写了一个函数，在某个条件下将记录创建到数据库中的表中，但Web2py会创建记录，尽管该条件未被填充

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

下面是函数

def buy_product():
    price = price_set(db,auth,'product')
    balance = limit(db,auth,'settings','account_balance')
    if balance !=None:
        if balance < price:
            form=redirect(URL('order'))
        else:
            form=crud.create(db.letter)
            if form.accepts(request.vars, session):
                tax = float(postage(form.vars.tax_type).replace("-","."))
                ##########################
                # I'm talking about this #
                ##########################
                if balance < (price + tax):
                    response.flash='You don\'t have enough balance to buy this product'
                    redirect(URL('not_processed'))
                else:
                    function_1(....)
                    ...
                    ...
                    update_field(db,auth,'settings','account_balance',-price)
                    response.flash='Done'
                    redirect(URL('products'))
                    pass
            elif form.errors:
                response.flash='Error 01'
            else:
                pass
            ###############################
    else:
        form=redirect(URL('settings'))
    return dict(form=form)

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

有什么想法吗

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

---

谢谢

Crud在内部管理插入/更新，并且不使用表单。接受

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

您有两个选择：

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

1-使用SQLFORM

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

    form=SQLFORM(db.letter)
    if form.accepts(request.vars, session):
        tax = float(postage(form.vars.tax_type).replace("-","."))
        ##########################
        # I'm talking about this #
        ##########################

2-使用crud事件

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass

def myfunction(form):
    # do your stuff here
    # it will be called only when form is accepted

def myotherfunction(form):
    if form.errors:
        #do something here in case of errors
        #it will be called during the form validation

crud.settings.create_onvalidation = myotherfunction
crud.settings.create_onaccept = myfunction
#the above can be:
#crud.create_onaccept = lambda form: myfunction(form)

# define the above events before the creation of the form
form=crud.create(db.letter)

---

请注意，SQLFORM与crud有点不同，SQLFORM希望您使用form.accepts方法验证表单，而crud在内部进行验证，并使用事件作为onvalidation、onaccept来接受自定义验证。

您还应该能够这样做：

form=crud.create（db.letter，onvalidation=myvalidationfunction）

SQLFORM和crud都接受onvalidation参数。我相信，如果使用

form.errors.field=“Cannot do”

无法满足这些条件，那么您可以检查额外的条件并添加错误。我之所以提到它，是因为您可能不希望所有CRUD都使用单一的onvalidation函数，并且您可能有充分的理由使用CRUD而不是SQLFORM（SQLFORM也接受onvalidation参数）。请参阅：了解更多信息

        function_1(....)
        ...
        ...
        update_field(db,auth,'settings','account_balance',-price)
        response.flash='Done'
        redirect(URL('products'))
        pass