我在python中有基本的flask应用程序。
我有放置方法来更新数据。我想更新数据库中的助手，但图像未更新。
在html页面上，有'inputfile'参数，该参数应下载上传的文件，然后将其返回给功能。
但是我不知道如何解决。我希望来自“ inputfile”的图像位于updated_assistant.data中，以便以后可以对其进行处理。
这是我的程序：
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
db = SQLAlchemy(app)
migrate = Migrate(app, db)
class Job(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(80), nullable=False)
class Picture(db.Model):
id = db.Column(db.Integer, primary_key=True)
data = db.Column(db.LargeBinary)
class Assistant(db.Model):
id = db.Column(db.Integer, primary_key=True)
job_id = db.Column(db.Integer, db.ForeignKey('job.id'), nullable=False)
first_name = db.Column(db.String(80), nullable=False)
last_name = db.Column(db.String(80), nullable=False)
email_address = db.Column(db.String(80), nullable=False)
pic_name = db.Column(db.String(300))
data = db.Column(db.LargeBinary)
@app.route('/')
def index():
return render_template('home.html')
def pic_2_thumbnail(image):
im = Image.open(image)
return im
def pic_to_bytes(im):
imgByteArr = io.BytesIO()
im.save(imgByteArr, format='BMP')
imgByteArr = imgByteArr.getvalue()
return imgByteArr
@app.route('/assistants/update/<int:id>', methods=['GET'])
def display_update(id):
# updated_assistant = Assistant.query.get_or_404(id)
assistant_job = db.session.query(Assistant, Job).filter((Assistant.job_id==Job.id) & (Assistant.id==id)).all()
print(assistant_job)
jobs = Job.query.all()
return render_template('update_assistant.html',
assistant_job=assistant_job,
jobs=jobs
)
@app.route('/assistants/<int:id>', methods=['PUT'])
def update_assistant(id):
updated_assistant = Assistant.query.get_or_404(id)
data = request.json
print(data)
print(request)
updated_assistant.job_id = data['job_id']
updated_assistant.first_name = data['first_name']
updated_assistant.last_name = data['last_name']
updated_assistant.email_address = data['email_address']
if data['inputfile'] != '':
image = data['inputfile']
size = 80, 80
im = pic_2_thumbnail(image)
im.thumbnail(size)
x= pic_to_bytes(im)
updated_assistant.data = x
try:
db.session.commit()
return jsonify({'ok': 'ok'})
except Exception as e:
print(str(e))
return 'There was an issue updating your assistant'
这里是html页面：
{% extends 'base.html' %}
{% block head %}
<head>
<h3>Assistant Registration Update Forumlar</h3>
</head>
{% endblock %}
{% block body %}
<script>
function updateAssistant() {
id = '{{ assistant_job.0.0.id }}';
console.log(id);
url = window.location.origin + '/assistants/' + id;
fetch(url, {
method: 'PUT',
body: JSON.stringify({
'first_name' : document.getElementById('first_name').value,
'last_name' : document.getElementById('last_name').value,
'email_address' : document.getElementById('email_address').value,
'job_id' : document.getElementById('job_id').value,
'inputfile' : document.getElementById('inputfile').value,
}),
headers: {
'Content-Type': 'application/json'
},
})
.then(res => res.json())
.then(data => location.replace(window.location.origin + '/assistants'));
return false;
};
</script>
<form onsubmit="return updateAssistant()">
{% for assistant, job in assistant_job %}
<div class="form-group">
<label for="exampleFormControlINput1">First name:</label>
<input type="text" name="first_name" id="first_name" class="form-control" id="exampleFormControlInput1"
value="{{assistant.first_name}}" required>
<br>
<label>Lastname:</label>
<input type="text" name="last_name" id="last_name" class="form-control" id="exampleFormControlInput1"
value="{{assistant.last_name}}" required>
<br>
<label>Email:</label>
<input type="email" name="email_address" id="email_address" class="form-control" id="exampleFormControlInput1"
value="{{assistant.email_address}}" required>
<br>
<label for="exampleFormControlSelect1">Job name:</label>
<select name='job_id' class="form-control" id="job_id" id="exampleFormControlSelect1"
value="{{assistant.job_id}}" required>
<option value="{{ job.id}} ">
{{job.title}}
</option>
{% for job in jobs %}
<option value="{{ job.id }}">
{{ job.title }}
</option>
{% endfor %}
</select>
<br>
<label for="exampleFormControlFile1">Upload picture:</label>
<input type = "file" name = "inputfile" class="form-control-file" id="exampleFormControlFile1">
<br>
</div>
{% endfor %}
<input type="submit" name="Submit" value="Submit"/>
</form>
</div>
{% endblock %}
'inputfile' : document.getElementById('inputfile').value,