如何使用現有資料為“編輯個人資料”路線預先填寫FlaskWTForms表格？

問題

每當我向屬性form.[any-field-name].data寫入資料時，寫入的資料就會出現在表單中，這正是我想要的。但是，如果在呈現表單時在表單欄位中進行了更改，則新值似乎僅存盤在form.[any-field-name].raw_data. form.[any-field-name].data僅顯示在.data用戶有機會在欄位中鍵入新值之前寫入的原始值。

顯然我可以從 中獲取結果.raw_data，但這會破壞擁有表單驗證庫的目的。如何優雅地為用戶預填充表單欄位，同時允許 Flask-WTForms 接受來自這些相同欄位的新資料？

僅供參考：這與典型的“編輯個人資料”路線有點不同，因為我的應用UserVersion每次進行個人資料編輯時都會創建一個新記錄。

燒瓶路線

@app.route("/edit_user", methods=["GET", "POST"])
@login_required
def edit_user_self():
    """Edit user account that is currently logged in."""

    # get latest version of currently logged in user
    user_version = current_user.user_versions[0]

    # instantiate form and fill with existing data
    form = EditUserForm()
    form.username.data = user_version.username
    form.email.data = user_version.email
    form.addr_housenumber.data = user_version.addr_housenumber
    form.addr_street.data = user_version.addr_street
    form.addr_unit.data = user_version.addr_unit
    form.addr_city.data = user_version.addr_city
    form.addr_state.data = user_version.addr_state
    form.addr_postcode.data = user_version.addr_postcode

    if not form.validate_on_submit():
        return render_template("edit_user.html", form=form)
    else:
        # create new user version
        new_user_version = UserVersion(user=current_user,
            username = form.username.data,
            password = user_version.password,
            email = form.email.data,
            addr_housenumber = form.addr_housenumber.data,
            addr_street = form.addr_street.data,
            addr_unit = form.addr_unit.data,
            addr_city = form.addr_city.data,
            addr_state = form.addr_state.data,
            addr_postcode = form.addr_postcode.data
        )

        db.session.add(new_user_version)
        db.session.commit()

        flash("Changes saved")
        return redirect("/view_user")

表格模型

class EditUserForm(FlaskForm):
    username = StringField(
        "Username", validators=[DataRequired(message="Please enter a username")]
    )
    email = StringField(
        "Email",
        validators=[
            DataRequired(),
            Email(message="Please enter a valid email address"),
        ],
    )
    addr_housenumber = StringField("Housenumber", validators=[Length(max=80)])
    addr_housename = StringField("Housename", validators=[Length(max=80)])
    addr_conscriptionnumber = StringField(
        "Conscription Number", validators=[Length(max=80)]
    )
    addr_street = StringField("Street", validators=[Length(max=80)])
    addr_place = StringField("Place", validators=[Length(max=80)])
    addr_postcode = StringField("Postcode", validators=[Length(max=80)])
    addr_city = StringField("City", validators=[Length(max=80)])
    addr_country = StringField("Country", validators=[Length(max=80)])
    addr_hamlet = StringField("Hamlet", validators=[Length(max=80)])
    addr_suburb = StringField("Suburb", validators=[Length(max=80)])
    addr_subdistrict = StringField("Subdistrict", validators=[Length(max=80)])
    addr_province = StringField("Province", validators=[Length(max=80)])
    addr_state = StringField("State", validators=[Length(max=80)])
    addr_door = StringField("Door", validators=[Length(max=80)])
    addr_unit = StringField("Unit", validators=[Length(max=80)])
    addr_floor = StringField("Floor", validators=[Length(max=80)])
    addr_block = StringField("Block", validators=[Length(max=80)])
    submit = SubmitField("Save")

庫版本

• 燒瓶 1.1.2
• 燒瓶WTForms 0.14.3
• 燒瓶 SQLAlchemy 2.1

uj5u.com熱心網友回復：

為此，我使用占位符。您可以通過以下方式預先填寫 edit_user_self：

form.username.render_kw({'placeholder':user_version.email})

否則你可以在 jinja 中這樣做：

{{wtf.form_field(form.email,
 placeholder=user_version.email)}}

但要這樣做，您應該將附加資訊傳遞給 jinja 模板。

uj5u.com熱心網友回復：

你需要交換你的邏輯。首先測驗表單提交并驗證，否則預填充并回傳表單：

@app.route('/submit', methods=['GET', 'POST'])
def submit():
    form = MyForm()
    
    if form.validate_on_submit():
        #Validate and Process submitted form first:
        new_user_version = UserVersion(user=current_user,
                                       username = form.username.data)

        db.session.add(new_user_version)
        db.session.commit()
        return redirect('/success')

    user_version = current_user.user_versions[0]
    #Pre-populate your form here:
    form.username.data = user_version.username

    return render_template('submit.html', form=form)

標籤：Python 验证 烧瓶 烧瓶-sqlalchemy 烧瓶wtforms

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