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POHow to download a generator with Python Flask?
 

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  1. POHow to download a generator with Python Flask?
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    <p>I'm writing an application that generates large amounts of data that the end user will download (CSV files). I currently have a page that generates the data based on entry into a form and returns the created generator object to the user, like so:</p> <pre><code>@app.route('/data', methods = ['GET', 'POST']) def data(): form = Form() if form.validate_on_submit(): generator = create_generator(form) name = "results.csv" return Response(generator, mimetype="text/plain", headers={"Content-Disposition": "attachment;filename={}".format(name)}) return render_template('data.html', title = 'Data Page', form = form) </code></pre> <p>Now, what I would like to do is take that generator, along with some additional data, and pass it to another view/page in the application, so something like:</p> <pre><code>@app.route('/data', methods = ['GET', 'POST']) def data(): form = Form() if form.validate_on_submit(): generator, data = create_generator(form) name = "results.csv" #Can't send data in a redirect, but for example... redirect('/result', generator=generator, data=data, name=name) return render_template('data.html', title = 'Data Page', form = form) @app.route('/output', methods = ['GET', 'POST']) def output(): form = Form() return render_template('output.html', title = 'Output Page', generator=generator, data=data, name=name) </code></pre> <p>Where <code>output.html</code> would then have a clickable link to download the generator. In other words, the generator isn't returned immediately the way it is in the first example with <code>return Response()</code>, but instead waits for the user. </p> <p>To wrap up, the main two things I'm trying to do are:</p> <ol> <li>Pass a generator between pages </li> <li>Return a generator as a standard link (<code>&lt;a href={{generator}}&gt;&lt;/a&gt;</code> or something like that)</li> </ol>
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