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-
- <div class="section" id="upgrading-to-newer-releases">
-<h1>Upgrading to Newer Releases<a class="headerlink" href="#upgrading-to-newer-releases" title="Permalink to this headline">¶</a></h1>
-<p>Flask itself is changing like any software is changing over time. Most of
-the changes are the nice kind, the kind where you don&#8217;t have to change
-anything in your code to profit from a new release.</p>
-<p>However every once in a while there are changes that do require some
-changes in your code or there are changes that make it possible for you to
-improve your own code quality by taking advantage of new features in
-Flask.</p>
-<p>This section of the documentation enumerates all the changes in Flask from
-release to release and how you can change your code to have a painless
-updating experience.</p>
-<p>If you want to use the <cite>easy_install</cite> command to upgrade your Flask
-installation, make sure to pass it the <tt class="docutils literal"><span class="pre">-U</span></tt> parameter:</p>
-<div class="highlight-python"><pre>$ easy_install -U Flask</pre>
-</div>
-<div class="section" id="version-0-8">
-<h2>Version 0.8<a class="headerlink" href="#version-0-8" title="Permalink to this headline">¶</a></h2>
-<p>Flask introduced a new session interface system. We also noticed that
-there was a naming collision between <cite>flask.session</cite> the module that
-implements sessions and <a class="reference internal" href="api.html#flask.session" title="flask.session"><tt class="xref py py-data docutils literal"><span class="pre">flask.session</span></tt></a> which is the global session
-object. With that introduction we moved the implementation details for
-the session system into a new module called <tt class="xref py py-mod docutils literal"><span class="pre">flask.sessions</span></tt>. If you
-used the previously undocumented session support we urge you to upgrade.</p>
-<p>If invalid JSON data was submitted Flask will now raise a
-<a class="reference external" href="http://werkzeug.pocoo.org/docs/exceptions/#werkzeug.exceptions.BadRequest" title="(in Werkzeug v0.7)"><tt class="xref py py-exc docutils literal"><span class="pre">BadRequest</span></tt></a> exception instead of letting the
-default <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#ValueError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> bubble up. This has the advantage that you no
-longer have to handle that error to avoid an internal server error showing
-up for the user. If you were catching this down explicitly in the past
-as <cite>ValueError</cite> you will need to change this.</p>
-<p>Due to a bug in the test client Flask 0.7 did not trigger teardown
-handlers when the test client was used in a with statement. This was
-since fixed but might require some changes in your testsuites if you
-relied on this behavior.</p>
-</div>
-<div class="section" id="version-0-7">
-<h2>Version 0.7<a class="headerlink" href="#version-0-7" title="Permalink to this headline">¶</a></h2>
-<p>In Flask 0.7 we cleaned up the code base internally a lot and did some
-backwards incompatible changes that make it easier to implement larger
-applications with Flask. Because we want to make upgrading as easy as
-possible we tried to counter the problems arising from these changes by
-providing a script that can ease the transition.</p>
-<p>The script scans your whole application and generates an unified diff with
-changes it assumes are safe to apply. However as this is an automated
-tool it won&#8217;t be able to find all use cases and it might miss some. We
-internally spread a lot of deprecation warnings all over the place to make
-it easy to find pieces of code that it was unable to upgrade.</p>
-<p>We strongly recommend that you hand review the generated patchfile and
-only apply the chunks that look good.</p>
-<p>If you are using git as version control system for your project we
-recommend applying the patch with <tt class="docutils literal"><span class="pre">path</span> <span class="pre">-p1</span> <span class="pre">&lt;</span> <span class="pre">patchfile.diff</span></tt> and then
-using the interactive commit feature to only apply the chunks that look
-good.</p>
-<p>To apply the upgrade script do the following:</p>
-<ol class="arabic">
-<li><p class="first">Download the script: <a class="reference external" href="https://raw.github.com/mitsuhiko/flask/master/scripts/flask-07-upgrade.py">flask-07-upgrade.py</a></p>
-</li>
-<li><p class="first">Run it in the directory of your application:</p>
-<div class="highlight-python"><pre>python flask-07-upgrade.py &gt; patchfile.diff</pre>
-</div>
-</li>
-<li><p class="first">Review the generated patchfile.</p>
-</li>
-<li><p class="first">Apply the patch:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="n">patch</span> <span class="o">-</span><span class="n">p1</span> <span class="o">&lt;</span> <span class="n">patchfile</span><span class="o">.</span><span class="n">diff</span>
-</pre></div>
-</div>
-</li>
-<li><p class="first">If you were using per-module template folders you need to move some
-templates around. Previously if you had a folder named <tt class="docutils literal"><span class="pre">templates</span></tt>
-next to a blueprint named <tt class="docutils literal"><span class="pre">admin</span></tt> the implicit template path
-automatically was <tt class="docutils literal"><span class="pre">admin/index.html</span></tt> for a template file called
-<tt class="docutils literal"><span class="pre">templates/index.html</span></tt>. This no longer is the case. Now you need
-to name the template <tt class="docutils literal"><span class="pre">templates/admin/index.html</span></tt>. The tool will
-not detect this so you will have to do that on your own.</p>
-</li>
-</ol>
-<p>Please note that deprecation warnings are disabled by default starting
-with Python 2.7. In order to see the deprecation warnings that might be
-emitted you have to enabled them with the <a class="reference external" href="http://docs.python.org/dev/library/warnings.html#warnings" title="(in Python v3.3)"><tt class="xref py py-mod docutils literal"><span class="pre">warnings</span></tt></a> module.</p>
-<p>If you are working with windows and you lack the <cite>patch</cite> command line
-utility you can get it as part of various Unix runtime environments for
-windows including cygwin, msysgit or ming32. Also source control systems
-like svn, hg or git have builtin support for applying unified diffs as
-generated by the tool. Check the manual of your version control system
-for more information.</p>
-<div class="section" id="bug-in-request-locals">
-<h3>Bug in Request Locals<a class="headerlink" href="#bug-in-request-locals" title="Permalink to this headline">¶</a></h3>
-<p>Due to a bug in earlier implementations the request local proxies now
-raise a <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#RuntimeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">RuntimeError</span></tt></a> instead of an <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#AttributeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">AttributeError</span></tt></a> when they
-are unbound. If you caught these exceptions with <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#AttributeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">AttributeError</span></tt></a>
-before, you should catch them with <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#RuntimeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">RuntimeError</span></tt></a> now.</p>
-<p>Additionally the <a class="reference internal" href="api.html#flask.send_file" title="flask.send_file"><tt class="xref py py-func docutils literal"><span class="pre">send_file()</span></tt></a> function is now issuing
-deprecation warnings if you depend on functionality that will be removed
-in Flask 1.0. Previously it was possible to use etags and mimetypes
-when file objects were passed. This was unreliable and caused issues
-for a few setups. If you get a deprecation warning, make sure to
-update your application to work with either filenames there or disable
-etag attaching and attach them yourself.</p>
-<p>Old code:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="k">return</span> <span class="n">send_file</span><span class="p">(</span><span class="n">my_file_object</span><span class="p">)</span>
-<span class="k">return</span> <span class="n">send_file</span><span class="p">(</span><span class="n">my_file_object</span><span class="p">)</span>
-</pre></div>
-</div>
-<p>New code:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="k">return</span> <span class="n">send_file</span><span class="p">(</span><span class="n">my_file_object</span><span class="p">,</span> <span class="n">add_etags</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="upgrading-to-new-teardown-handling">
-<span id="id1"></span><h3>Upgrading to new Teardown Handling<a class="headerlink" href="#upgrading-to-new-teardown-handling" title="Permalink to this headline">¶</a></h3>
-<p>We streamlined the behavior of the callbacks for request handling. For
-things that modify the response the <a class="reference internal" href="api.html#flask.Flask.after_request" title="flask.Flask.after_request"><tt class="xref py py-meth docutils literal"><span class="pre">after_request()</span></tt></a>
-decorators continue to work as expected, but for things that absolutely
-must happen at the end of request we introduced the new
-<a class="reference internal" href="api.html#flask.Flask.teardown_request" title="flask.Flask.teardown_request"><tt class="xref py py-meth docutils literal"><span class="pre">teardown_request()</span></tt></a> decorator. Unfortunately that
-change also made after-request work differently under error conditions.
-It&#8217;s not consistently skipped if exceptions happen whereas previously it
-might have been called twice to ensure it is executed at the end of the
-request.</p>
-<p>If you have database connection code that looks like this:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="nd">@app.after_request</span>
-<span class="k">def</span> <span class="nf">after_request</span><span class="p">(</span><span class="n">response</span><span class="p">):</span>
- <span class="n">g</span><span class="o">.</span><span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
- <span class="k">return</span> <span class="n">response</span>
-</pre></div>
-</div>
-<p>You are now encouraged to use this instead:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="nd">@app.teardown_request</span>
-<span class="k">def</span> <span class="nf">after_request</span><span class="p">(</span><span class="n">exception</span><span class="p">):</span>
- <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">g</span><span class="p">,</span> <span class="s">&#39;db&#39;</span><span class="p">):</span>
- <span class="n">g</span><span class="o">.</span><span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
-</pre></div>
-</div>
-<p>On the upside this change greatly improves the internal code flow and
-makes it easier to customize the dispatching and error handling. This
-makes it now a lot easier to write unit tests as you can prevent closing
-down of database connections for a while. You can take advantage of the
-fact that the teardown callbacks are called when the response context is
-removed from the stack so a test can query the database after request
-handling:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="k">with</span> <span class="n">app</span><span class="o">.</span><span class="n">test_client</span><span class="p">()</span> <span class="k">as</span> <span class="n">client</span><span class="p">:</span>
- <span class="n">resp</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">&#39;/&#39;</span><span class="p">)</span>
- <span class="c"># g.db is still bound if there is such a thing</span>
-
-<span class="c"># and here it&#39;s gone</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="manual-error-handler-attaching">
-<h3>Manual Error Handler Attaching<a class="headerlink" href="#manual-error-handler-attaching" title="Permalink to this headline">¶</a></h3>
-<p>While it is still possible to attach error handlers to
-<tt class="xref py py-attr docutils literal"><span class="pre">Flask.error_handlers</span></tt> it&#8217;s discouraged to do so and in fact
-deprecated. In generaly we no longer recommend custom error handler
-attaching via assignments to the underlying dictionary due to the more
-complex internal handling to support arbitrary exception classes and
-blueprints. See <tt class="xref py py-meth docutils literal"><span class="pre">Flask.errorhandler()</span></tt> for more information.</p>
-<p>The proper upgrade is to change this:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="n">app</span><span class="o">.</span><span class="n">error_handlers</span><span class="p">[</span><span class="mi">403</span><span class="p">]</span> <span class="o">=</span> <span class="n">handle_error</span>
-</pre></div>
-</div>
-<p>Into this:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="n">app</span><span class="o">.</span><span class="n">register_error_handler</span><span class="p">(</span><span class="mi">403</span><span class="p">,</span> <span class="n">handle_error</span><span class="p">)</span>
-</pre></div>
-</div>
-<p>Alternatively you should just attach the function with a decorator:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="nd">@app.errorhandler</span><span class="p">(</span><span class="mi">403</span><span class="p">)</span>
-<span class="k">def</span> <span class="nf">handle_error</span><span class="p">(</span><span class="n">e</span><span class="p">):</span>
- <span class="o">...</span>
-</pre></div>
-</div>
-<p>(Note that <tt class="xref py py-meth docutils literal"><span class="pre">register_error_handler()</span></tt> is new in Flask 0.7)</p>
-</div>
-<div class="section" id="blueprint-support">
-<h3>Blueprint Support<a class="headerlink" href="#blueprint-support" title="Permalink to this headline">¶</a></h3>
-<p>Blueprints replace the previous concept of “Modules” in Flask. They
-provide better semantics for various features and work better with large
-applications. The update script provided should be able to upgrade your
-applications automatically, but there might be some cases where it fails
-to upgrade. What changed?</p>
-<ul class="simple">
-<li>Blueprints need explicit names. Modules had an automatic name
-guesssing scheme where the shortname for the module was taken from the
-last part of the import module. The upgrade script tries to guess
-that name but it might fail as this information could change at
-runtime.</li>
-<li>Blueprints have an inverse behavior for <tt class="xref py py-meth docutils literal"><span class="pre">url_for()</span></tt>. Previously
-<tt class="docutils literal"><span class="pre">.foo</span></tt> told <tt class="xref py py-meth docutils literal"><span class="pre">url_for()</span></tt> that it should look for the endpoint
-<cite>foo</cite> on the application. Now it means “relative to current module”.
-The script will inverse all calls to <tt class="xref py py-meth docutils literal"><span class="pre">url_for()</span></tt> automatically for
-you. It will do this in a very eager way so you might end up with
-some unnecessary leading dots in your code if you&#8217;re not using
-modules.</li>
-<li>Blueprints do not automatically provide static folders. They will
-also no longer automatically export templates from a folder called
-<cite>templates</cite> next to their location however but it can be enabled from
-the constructor. Same with static files: if you want to continue
-serving static files you need to tell the constructor explicitly the
-path to the static folder (which can be relative to the blueprint&#8217;s
-module path).</li>
-<li>Rendering templates was simplified. Now the blueprints can provide
-template folders which are added to a general template searchpath.
-This means that you need to add another subfolder with the blueprint&#8217;s
-name into that folder if you want <tt class="docutils literal"><span class="pre">blueprintname/template.html</span></tt> as
-the template name.</li>
-</ul>
-<p>If you continue to use the <cite>Module</cite> object which is deprecated, Flask will
-restore the previous behavior as good as possible. However we strongly
-recommend upgrading to the new blueprints as they provide a lot of useful
-improvement such as the ability to attach a blueprint multiple times,
-blueprint specific error handlers and a lot more.</p>
-</div>
-</div>
-<div class="section" id="version-0-6">
-<h2>Version 0.6<a class="headerlink" href="#version-0-6" title="Permalink to this headline">¶</a></h2>
-<p>Flask 0.6 comes with a backwards incompatible change which affects the
-order of after-request handlers. Previously they were called in the order
-of the registration, now they are called in reverse order. This change
-was made so that Flask behaves more like people expected it to work and
-how other systems handle request pre- and postprocessing. If you
-depend on the order of execution of post-request functions, be sure to
-change the order.</p>
-<p>Another change that breaks backwards compatibility is that context
-processors will no longer override values passed directly to the template
-rendering function. If for example <cite>request</cite> is as variable passed
-directly to the template, the default context processor will not override
-it with the current request object. This makes it easier to extend
-context processors later to inject additional variables without breaking
-existing template not expecting them.</p>
-</div>
-<div class="section" id="version-0-5">
-<h2>Version 0.5<a class="headerlink" href="#version-0-5" title="Permalink to this headline">¶</a></h2>
-<p>Flask 0.5 is the first release that comes as a Python package instead of a
-single module. There were a couple of internal refactoring so if you
-depend on undocumented internal details you probably have to adapt the
-imports.</p>
-<p>The following changes may be relevant to your application:</p>
-<ul class="simple">
-<li>autoescaping no longer happens for all templates. Instead it is
-configured to only happen on files ending with <tt class="docutils literal"><span class="pre">.html</span></tt>, <tt class="docutils literal"><span class="pre">.htm</span></tt>,
-<tt class="docutils literal"><span class="pre">.xml</span></tt> and <tt class="docutils literal"><span class="pre">.xhtml</span></tt>. If you have templates with different
-extensions you should override the
-<a class="reference internal" href="api.html#flask.Flask.select_jinja_autoescape" title="flask.Flask.select_jinja_autoescape"><tt class="xref py py-meth docutils literal"><span class="pre">select_jinja_autoescape()</span></tt></a> method.</li>
-<li>Flask no longer supports zipped applications in this release. This
-functionality might come back in future releases if there is demand
-for this feature. Removing support for this makes the Flask internal
-code easier to understand and fixes a couple of small issues that make
-debugging harder than necessary.</li>
-<li>The <cite>create_jinja_loader</cite> function is gone. If you want to customize
-the Jinja loader now, use the
-<a class="reference internal" href="api.html#flask.Flask.create_jinja_environment" title="flask.Flask.create_jinja_environment"><tt class="xref py py-meth docutils literal"><span class="pre">create_jinja_environment()</span></tt></a> method instead.</li>
-</ul>
-</div>
-<div class="section" id="version-0-4">
-<h2>Version 0.4<a class="headerlink" href="#version-0-4" title="Permalink to this headline">¶</a></h2>
-<p>For application developers there are no changes that require changes in
-your code. In case you are developing on a Flask extension however, and
-that extension has a unittest-mode you might want to link the activation
-of that mode to the new <tt class="docutils literal"><span class="pre">TESTING</span></tt> flag.</p>
-</div>
-<div class="section" id="version-0-3">
-<h2>Version 0.3<a class="headerlink" href="#version-0-3" title="Permalink to this headline">¶</a></h2>
-<p>Flask 0.3 introduces configuration support and logging as well as
-categories for flashing messages. All these are features that are 100%
-backwards compatible but you might want to take advantage of them.</p>
-<div class="section" id="configuration-support">
-<h3>Configuration Support<a class="headerlink" href="#configuration-support" title="Permalink to this headline">¶</a></h3>
-<p>The configuration support makes it easier to write any kind of application
-that requires some sort of configuration. (Which most likely is the case
-for any application out there).</p>
-<p>If you previously had code like this:</p>
-<div class="highlight-python"><div class="highlight"><pre><span class="n">app</span><span class="o">.</span><span class="n">debug</span> <span class="o">=</span> <span class="n">DEBUG</span>
-<span class="n">app</span><span class="o">.</span><span class="n">secret_key</span> <span class="o">=</span> <span class="n">SECRET_KEY</span>
-</pre></div>
-</div>
-<p>You no longer have to do that, instead you can just load a configuration
-into the config object. How this works is outlined in <a class="reference internal" href="config.html#config"><em>Configuration Handling</em></a>.</p>
-</div>
-<div class="section" id="logging-integration">
-<h3>Logging Integration<a class="headerlink" href="#logging-integration" title="Permalink to this headline">¶</a></h3>
-<p>Flask now configures a logger for you with some basic and useful defaults.
-If you run your application in production and want to profit from
-automatic error logging, you might be interested in attaching a proper log
-handler. Also you can start logging warnings and errors into the logger
-when appropriately. For more information on that, read
-<a class="reference internal" href="errorhandling.html#application-errors"><em>Handling Application Errors</em></a>.</p>
-</div>
-<div class="section" id="categories-for-flash-messages">
-<h3>Categories for Flash Messages<a class="headerlink" href="#categories-for-flash-messages" title="Permalink to this headline">¶</a></h3>
-<p>Flash messages can now have categories attached. This makes it possible
-to render errors, warnings or regular messages differently for example.
-This is an opt-in feature because it requires some rethinking in the code.</p>
-<p>Read all about that in the <a class="reference internal" href="patterns/flashing.html#message-flashing-pattern"><em>Message Flashing</em></a> pattern.</p>
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- <h3><a href="index.html">Table Of Contents</a></h3>
- <ul>
-<li><a class="reference internal" href="#">Upgrading to Newer Releases</a><ul>
-<li><a class="reference internal" href="#version-0-8">Version 0.8</a></li>
-<li><a class="reference internal" href="#version-0-7">Version 0.7</a><ul>
-<li><a class="reference internal" href="#bug-in-request-locals">Bug in Request Locals</a></li>
-<li><a class="reference internal" href="#upgrading-to-new-teardown-handling">Upgrading to new Teardown Handling</a></li>
-<li><a class="reference internal" href="#manual-error-handler-attaching">Manual Error Handler Attaching</a></li>
-<li><a class="reference internal" href="#blueprint-support">Blueprint Support</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#version-0-6">Version 0.6</a></li>
-<li><a class="reference internal" href="#version-0-5">Version 0.5</a></li>
-<li><a class="reference internal" href="#version-0-4">Version 0.4</a></li>
-<li><a class="reference internal" href="#version-0-3">Version 0.3</a><ul>
-<li><a class="reference internal" href="#configuration-support">Configuration Support</a></li>
-<li><a class="reference internal" href="#logging-integration">Logging Integration</a></li>
-<li><a class="reference internal" href="#categories-for-flash-messages">Categories for Flash Messages</a></li>
-</ul>
-</li>
-</ul>
-</li>
-</ul>
-<h3>Related Topics</h3>
-<ul>
- <li><a href="index.html">Documentation overview</a><ul>
- <li>Previous: <a href="styleguide.html" title="previous chapter">Pocoo Styleguide</a></li>
- <li>Next: <a href="changelog.html" title="next chapter">Flask Changelog</a></li>
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