How to download a file from Flask with send_from_directory?
Question
Hi I am having trouble downloading a csv file in Flask which is stored in csv_files folder. The structure of the files is as below. I am getting requested url is not found on server error. Please help I am a novice Flask user.
I have an export file route which generates the excel file with a random name. It then redirects to download route. fname is the name of the file. I have made it as global
@app.route("/exportfile",methods=["GET","POST"])
def exportfile():
if request.method=='GET':
export_list=End_list.query.all()
print(export_list)
global fname
fname = str(uuid.uuid4())
outfile = open(f'./csv_files/{fname}.csv', 'w',newline='')
outcsv = csv.writer(outfile)
outcsv.writerow(["Sr Number","SK","Quantity","Length","ToolCode","Description"])
for x in export_list:
outcsv.writerow([x.srnuml,x.sk,x.quantity,x.length,x.toolcode,x.description.strip()])
outfile.close()
return redirect(url_for("download"))
I have a route handling the download. There's a download button in the html which does a POST request.
@app.route("/download",methods=["GET","POST"])
def download():
if request.method=="GET":
return render_template("download.html")
elif request.method=="POST":
return send_from_directory(app.config['UPLOAD_FOLDER'], filename=fname, as_attachment=True, cache_timeout=0)
In my controllers, I have defined the upload folder as below.
import os
basedir = os.path.abspath(os.path.dirname(__file__))
class Config:
DEBUG = False
SQLITE_DB_DIR = None
SQLALCHEMY_DATABASE_URI = None
SQLALCHEMY_TRACK_MODIFICATIONS = False
UPLOAD_FOLDER = None
class LocalDevelopmentConfig(Config):
SQLITE_DB_DIR = os.path.join(basedir)
SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(SQLITE_DB_DIR, "toolcodes.sqlite3")
UPLOAD_FOLDER = basedir+"/csv_files"
DEBUG = True
My download.html is as below:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
Download will happen here
<br><br>
<form method="POST" action="/download">
<input name="Download" type="submit" value="Download">
</form>
<br>
<a href="{{url_for('dashboard')}}"> Go to dashboard</a>
</body>
</html>
2 answers
solution1
0 2021-12-20 02:17:32
from flask import send_file
@app.route('/download',methods=["GET","POST"])
def downloadFile(csvFileName): #In your case fname is your filename
try:
path = f'./csv_files/{csvFileName}'
return send_file(path,mimetype='text/csv', attachment_filename=csvFileName, as_attachment=True)
except Exception as e:
return str(e)
solution2
0 2021-12-20 02:31:28
@app.route("/exportfile",methods=["GET","POST"])
def exportfile():
if request.method=='GET':
export_list=End_list.query.all()
print(export_list)
global fname
fname = str(uuid.uuid4())
session['fname'] = fname # change here
outfile = open(f'./csv_files/{fname}.csv', 'w',newline='')
outcsv = csv.writer(outfile)
outcsv.writerow(["Sr Number","SK","Quantity","Length","ToolCode","Description"])
for x in export_list:
outcsv.writerow([x.srnuml,x.sk,x.quantity,x.length,x.toolcode,x.description.strip()])
outfile.close()
return redirect(url_for("download"))
retrieve session data in download()
@app.route("/download",methods=["GET","POST"])
def download():
if request.method=="GET":
return render_template("download.html")
elif request.method=="POST":
if 'fname' in session:
csvFileName = session['fname']
return send_from_directory(app.config['UPLOAD_FOLDER'], filename=csvFileName , as_attachment=True, cache_timeout=0)
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