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<h1>Source code for django.shortcuts</h1><div class="highlight"><pre>
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<span></span><span class="sd">"""</span>
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<span class="sd">This module collects helper functions and classes that "span" multiple levels</span>
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<span class="sd">of MVC. In other words, these functions/classes introduce controlled coupling</span>
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<span class="sd">for convenience's sake.</span>
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<span class="sd">"""</span>
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|
<span class="kn">from</span><span class="w"> </span><span class="nn">django.http</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
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<span class="n">Http404</span><span class="p">,</span>
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<span class="n">HttpResponse</span><span class="p">,</span>
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<span class="n">HttpResponsePermanentRedirect</span><span class="p">,</span>
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<span class="n">HttpResponseRedirect</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">django.template</span><span class="w"> </span><span class="kn">import</span> <span class="n">loader</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">django.urls</span><span class="w"> </span><span class="kn">import</span> <span class="n">NoReverseMatch</span><span class="p">,</span> <span class="n">reverse</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">django.utils.functional</span><span class="w"> </span><span class="kn">import</span> <span class="n">Promise</span>
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<div class="viewcode-block" id="render">
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<a class="viewcode-back" href="../../api/evennia.web.website.views.errors.html#evennia.web.admin.frontpage.render">[docs]</a>
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<span class="k">def</span><span class="w"> </span><span class="nf">render</span><span class="p">(</span>
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<span class="n">request</span><span class="p">,</span> <span class="n">template_name</span><span class="p">,</span> <span class="n">context</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">content_type</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">status</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">using</span><span class="o">=</span><span class="kc">None</span>
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<span class="p">):</span>
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<span class="w"> </span><span class="sd">"""</span>
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<span class="sd"> Return an HttpResponse whose content is filled with the result of calling</span>
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<span class="sd"> django.template.loader.render_to_string() with the passed arguments.</span>
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<span class="sd"> """</span>
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<span class="n">content</span> <span class="o">=</span> <span class="n">loader</span><span class="o">.</span><span class="n">render_to_string</span><span class="p">(</span><span class="n">template_name</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">using</span><span class="o">=</span><span class="n">using</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">HttpResponse</span><span class="p">(</span><span class="n">content</span><span class="p">,</span> <span class="n">content_type</span><span class="p">,</span> <span class="n">status</span><span class="p">)</span></div>
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<span class="k">def</span><span class="w"> </span><span class="nf">redirect</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="n">permanent</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""</span>
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<span class="sd"> Return an HttpResponseRedirect to the appropriate URL for the arguments</span>
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<span class="sd"> passed.</span>
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<span class="sd"> The arguments could be:</span>
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<span class="sd"> * A model: the model's `get_absolute_url()` function will be called.</span>
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<span class="sd"> * A view name, possibly with arguments: `urls.reverse()` will be used</span>
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<span class="sd"> to reverse-resolve the name.</span>
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<span class="sd"> * A URL, which will be used as-is for the redirect location.</span>
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<span class="sd"> Issues a temporary redirect by default; pass permanent=True to issue a</span>
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<span class="sd"> permanent redirect.</span>
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<span class="sd"> """</span>
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<span class="n">redirect_class</span> <span class="o">=</span> <span class="p">(</span>
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<span class="n">HttpResponsePermanentRedirect</span> <span class="k">if</span> <span class="n">permanent</span> <span class="k">else</span> <span class="n">HttpResponseRedirect</span>
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|
<span class="p">)</span>
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<span class="k">return</span> <span class="n">redirect_class</span><span class="p">(</span><span class="n">resolve_url</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">))</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">_get_queryset</span><span class="p">(</span><span class="n">klass</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""</span>
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<span class="sd"> Return a QuerySet or a Manager.</span>
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|
<span class="sd"> Duck typing in action: any class with a `get()` method (for</span>
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<span class="sd"> get_object_or_404) or a `filter()` method (for get_list_or_404) might do</span>
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<span class="sd"> the job.</span>
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<span class="sd"> """</span>
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<span class="c1"># If it is a model class or anything else with ._default_manager</span>
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<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="s2">"_default_manager"</span><span class="p">):</span>
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<span class="k">return</span> <span class="n">klass</span><span class="o">.</span><span class="n">_default_manager</span><span class="o">.</span><span class="n">all</span><span class="p">()</span>
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<span class="k">return</span> <span class="n">klass</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">get_object_or_404</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""</span>
|
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<span class="sd"> Use get() to return an object, or raise an Http404 exception if the object</span>
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<span class="sd"> does not exist.</span>
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<span class="sd"> klass may be a Model, Manager, or QuerySet object. All other passed</span>
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<span class="sd"> arguments and keyword arguments are used in the get() query.</span>
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<span class="sd"> Like with QuerySet.get(), MultipleObjectsReturned is raised if more than</span>
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<span class="sd"> one object is found.</span>
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<span class="sd"> """</span>
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<span class="n">queryset</span> <span class="o">=</span> <span class="n">_get_queryset</span><span class="p">(</span><span class="n">klass</span><span class="p">)</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">queryset</span><span class="p">,</span> <span class="s2">"get"</span><span class="p">):</span>
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<span class="n">klass__name</span> <span class="o">=</span> <span class="p">(</span>
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|
<span class="n">klass</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="n">klass</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
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<span class="p">)</span>
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<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
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<span class="s2">"First argument to get_object_or_404() must be a Model, Manager, "</span>
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<span class="s2">"or QuerySet, not '</span><span class="si">%s</span><span class="s2">'."</span> <span class="o">%</span> <span class="n">klass__name</span>
|
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<span class="p">)</span>
|
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<span class="k">try</span><span class="p">:</span>
|
|
<span class="k">return</span> <span class="n">queryset</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
|
|
<span class="k">except</span> <span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">DoesNotExist</span><span class="p">:</span>
|
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<span class="k">raise</span> <span class="n">Http404</span><span class="p">(</span>
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<span class="s2">"No </span><span class="si">%s</span><span class="s2"> matches the given query."</span> <span class="o">%</span> <span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">object_name</span>
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<span class="p">)</span>
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|
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<span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">aget_object_or_404</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
|
|
<span class="w"> </span><span class="sd">"""See get_object_or_404()."""</span>
|
|
<span class="n">queryset</span> <span class="o">=</span> <span class="n">_get_queryset</span><span class="p">(</span><span class="n">klass</span><span class="p">)</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">queryset</span><span class="p">,</span> <span class="s2">"aget"</span><span class="p">):</span>
|
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<span class="n">klass__name</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="n">klass</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="n">klass</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
|
|
<span class="p">)</span>
|
|
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
|
<span class="s2">"First argument to aget_object_or_404() must be a Model, Manager, or "</span>
|
|
<span class="sa">f</span><span class="s2">"QuerySet, not '</span><span class="si">{</span><span class="n">klass__name</span><span class="si">}</span><span class="s2">'."</span>
|
|
<span class="p">)</span>
|
|
<span class="k">try</span><span class="p">:</span>
|
|
<span class="k">return</span> <span class="k">await</span> <span class="n">queryset</span><span class="o">.</span><span class="n">aget</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
|
|
<span class="k">except</span> <span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">DoesNotExist</span><span class="p">:</span>
|
|
<span class="k">raise</span> <span class="n">Http404</span><span class="p">(</span><span class="sa">f</span><span class="s2">"No </span><span class="si">{</span><span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">object_name</span><span class="si">}</span><span class="s2"> matches the given query."</span><span class="p">)</span>
|
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|
|
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<span class="k">def</span><span class="w"> </span><span class="nf">get_list_or_404</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
|
|
<span class="w"> </span><span class="sd">"""</span>
|
|
<span class="sd"> Use filter() to return a list of objects, or raise an Http404 exception if</span>
|
|
<span class="sd"> the list is empty.</span>
|
|
|
|
<span class="sd"> klass may be a Model, Manager, or QuerySet object. All other passed</span>
|
|
<span class="sd"> arguments and keyword arguments are used in the filter() query.</span>
|
|
<span class="sd"> """</span>
|
|
<span class="n">queryset</span> <span class="o">=</span> <span class="n">_get_queryset</span><span class="p">(</span><span class="n">klass</span><span class="p">)</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">queryset</span><span class="p">,</span> <span class="s2">"filter"</span><span class="p">):</span>
|
|
<span class="n">klass__name</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="n">klass</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="n">klass</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
|
|
<span class="p">)</span>
|
|
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
|
<span class="s2">"First argument to get_list_or_404() must be a Model, Manager, or "</span>
|
|
<span class="s2">"QuerySet, not '</span><span class="si">%s</span><span class="s2">'."</span> <span class="o">%</span> <span class="n">klass__name</span>
|
|
<span class="p">)</span>
|
|
<span class="n">obj_list</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">queryset</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">))</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="n">obj_list</span><span class="p">:</span>
|
|
<span class="k">raise</span> <span class="n">Http404</span><span class="p">(</span>
|
|
<span class="s2">"No </span><span class="si">%s</span><span class="s2"> matches the given query."</span> <span class="o">%</span> <span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">object_name</span>
|
|
<span class="p">)</span>
|
|
<span class="k">return</span> <span class="n">obj_list</span>
|
|
|
|
|
|
<span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">aget_list_or_404</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
|
|
<span class="w"> </span><span class="sd">"""See get_list_or_404()."""</span>
|
|
<span class="n">queryset</span> <span class="o">=</span> <span class="n">_get_queryset</span><span class="p">(</span><span class="n">klass</span><span class="p">)</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">queryset</span><span class="p">,</span> <span class="s2">"filter"</span><span class="p">):</span>
|
|
<span class="n">klass__name</span> <span class="o">=</span> <span class="p">(</span>
|
|
<span class="n">klass</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="n">klass</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
|
|
<span class="p">)</span>
|
|
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
|
<span class="s2">"First argument to aget_list_or_404() must be a Model, Manager, or "</span>
|
|
<span class="sa">f</span><span class="s2">"QuerySet, not '</span><span class="si">{</span><span class="n">klass__name</span><span class="si">}</span><span class="s2">'."</span>
|
|
<span class="p">)</span>
|
|
<span class="n">obj_list</span> <span class="o">=</span> <span class="p">[</span><span class="n">obj</span> <span class="k">async</span> <span class="k">for</span> <span class="n">obj</span> <span class="ow">in</span> <span class="n">queryset</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)]</span>
|
|
<span class="k">if</span> <span class="ow">not</span> <span class="n">obj_list</span><span class="p">:</span>
|
|
<span class="k">raise</span> <span class="n">Http404</span><span class="p">(</span><span class="sa">f</span><span class="s2">"No </span><span class="si">{</span><span class="n">queryset</span><span class="o">.</span><span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">object_name</span><span class="si">}</span><span class="s2"> matches the given query."</span><span class="p">)</span>
|
|
<span class="k">return</span> <span class="n">obj_list</span>
|
|
|
|
|
|
<span class="k">def</span><span class="w"> </span><span class="nf">resolve_url</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
|
|
<span class="w"> </span><span class="sd">"""</span>
|
|
<span class="sd"> Return a URL appropriate for the arguments passed.</span>
|
|
|
|
<span class="sd"> The arguments could be:</span>
|
|
|
|
<span class="sd"> * A model: the model's `get_absolute_url()` function will be called.</span>
|
|
|
|
<span class="sd"> * A view name, possibly with arguments: `urls.reverse()` will be used</span>
|
|
<span class="sd"> to reverse-resolve the name.</span>
|
|
|
|
<span class="sd"> * A URL, which will be returned as-is.</span>
|
|
<span class="sd"> """</span>
|
|
<span class="c1"># If it's a model, use get_absolute_url()</span>
|
|
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="s2">"get_absolute_url"</span><span class="p">):</span>
|
|
<span class="k">return</span> <span class="n">to</span><span class="o">.</span><span class="n">get_absolute_url</span><span class="p">()</span>
|
|
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="n">Promise</span><span class="p">):</span>
|
|
<span class="c1"># Expand the lazy instance, as it can cause issues when it is passed</span>
|
|
<span class="c1"># further to some Python functions like urlparse.</span>
|
|
<span class="n">to</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">to</span><span class="p">)</span>
|
|
|
|
<span class="c1"># Handle relative URLs</span>
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="nb">str</span><span class="p">)</span> <span class="ow">and</span> <span class="n">to</span><span class="o">.</span><span class="n">startswith</span><span class="p">((</span><span class="s2">"./"</span><span class="p">,</span> <span class="s2">"../"</span><span class="p">)):</span>
|
|
<span class="k">return</span> <span class="n">to</span>
|
|
|
|
<span class="c1"># Next try a reverse URL resolution.</span>
|
|
<span class="k">try</span><span class="p">:</span>
|
|
<span class="k">return</span> <span class="n">reverse</span><span class="p">(</span><span class="n">to</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="o">=</span><span class="n">kwargs</span><span class="p">)</span>
|
|
<span class="k">except</span> <span class="n">NoReverseMatch</span><span class="p">:</span>
|
|
<span class="c1"># If this is a callable, re-raise.</span>
|
|
<span class="k">if</span> <span class="nb">callable</span><span class="p">(</span><span class="n">to</span><span class="p">):</span>
|
|
<span class="k">raise</span>
|
|
<span class="c1"># If this doesn't "feel" like a URL, re-raise.</span>
|
|
<span class="k">if</span> <span class="s2">"/"</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">to</span> <span class="ow">and</span> <span class="s2">"."</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">to</span><span class="p">:</span>
|
|
<span class="k">raise</span>
|
|
|
|
<span class="c1"># Finally, fall back and assume it's a URL</span>
|
|
<span class="k">return</span> <span class="n">to</span>
|
|
</pre></div>
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