Django Search
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The document defines a Django model named 'issue' with attributes including title, description, and various date fields, along with relationships to users and importance statuses. It also describes a search form for filtering issues based on different criteria and includes logic for processing search requests and executing queries to filter issues based on user input. Additionally, it presents a searcher class that helps construct query filters based on specified search parameters.
![Search: def search(search_data): q = Q() results = None searcher = IssueSearch(search_data) for key in search_data.iterkeys(): dispatch = getattr(searcher, 'search_%s' % key) q = dispatch(q) if q and len(q): results = Issue.objects.filter(q).select_related() #.order_by('-pk') else: results = [] return results](https://image.slidesharecdn.com/django-search-1232577702220554-3/85/Django-Search-6-320.jpg)
Django Search
- 3. The Model: class Issue(models.Model): title = models.CharField(max_length=250) description = models.TextField(blank=True) date_added = models.DateTimeField(auto_now_add=True) date_modified = models.DateTimeField(auto_now=True) date_completed = models.DateTimeField(null=True, blank=True) creator = models.ForeignKey(User, related_name="issue_creator") owner = models.ForeignKey(User, related_name="issue_owner", null=True, blank=True) stakeholders = models.ManyToManyField(User, related_name="issue_stakeholders", null=True, blank=True) date_due = models.DateTimeField(null=True, blank=True) status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='new') urgency = models.ForeignKey(Urgency, related_name="issue_urgency", null=True, blank=True) importance = models.ForeignKey(Importance, related_name="issue_importance", null=True, blank=True) visible = models.BooleanField(default=True) order = models.IntegerField(blank=True, null=True)
- 4. The Form: class SearchForm(forms.Form): """ Allows user to search for Issues based on certain criteria, none required, most found in Issue model """ keywords = forms.CharField(help_text='Keyword search of issue title and description', required=False) date_added = forms.DateTimeField(help_text='Date issue was created', required=False) date_modified = forms.DateTimeField(help_text='Date issue was last modified', required=False) date_completed = forms.DateTimeField(help_text='Date issue was closed', required=False) date_due = forms.DateTimeField(help_text='Date issue is due', required=False) status = forms.ChoiceField(choices=STATUS_CHOICES, required=False) urgency = forms.ModelChoiceField(queryset=Urgency.objects.all(), required=False) importance = forms.ModelChoiceField(queryset=Importance.objects.all(), required=False) creator = forms.ModelChoiceField(queryset=User.objects.all(), required=False) owner = forms.ModelChoiceField(queryset=User.objects.all(), required=False) stakeholder = forms.ModelChoiceField(queryset=User.objects.all(), required=False)
- 5. The search view: def issues_search(request, form_class=SearchForm, template_name='search.html'): form = None if request.method == 'POST': #do search form = form_class(request.POST) if form.is_valid(): results = search(form.cleaned_data) if results: return render_to_response(template_name, {'form': form, 'issues': results}) else: form = form_class() return render_to_response(template_name, {'form': form})
- 6. Search: def search(search_data): q = Q() results = None searcher = IssueSearch(search_data) for key in search_data.iterkeys(): dispatch = getattr(searcher, 'search_%s' % key) q = dispatch(q) if q and len(q): results = Issue.objects.filter(q).select_related() #.order_by('-pk') else: results = [] return results
- 7. Searcher: class IssueSearch(object): def __init__(self, search_data): self.__dict__.update(search_data) def search_keywords(self, q): """ Search should do both title and description, and OR the results together, and must iterate over list of keywords """ if self.keywords: words = self.keywords.split() title_q = Q() desc_q = Q() for word in words: title_q = title_q | Q(title__icontains=word) desc_q = desc_q | Q(description__icontains=word) keyword_q = title_q | desc_q q = q & keyword_q return q def search_date_added(self, q): if self.date_added: q = q & Q(date_added__exact=self.date_added) return q
- 8. Searcher, part 2: def search_owner(self, q): if self.owner: q = q & Q(owner__icontains=self.owner) return q def search_stakeholder(self, q): if self.stakeholder: if isinstance(self.stakeholder, list): q = q & Q(stakeholder__in=self.stakeholder) else: q = q & Q(stakeholder__icontains=self.stakeholder) return q
- 9. Questions?
Editor's Notes
- #2: How many folks have looked for code on djangosnippets? How many folks have cursed loudly, because djangosnippets doesn’t have a search field? How many folks have read the FAQ where James Bennett complains that Django doesn’t have a leading candidate for search, which is why djangosnippets has no search capability? How many people think that’s a lame excuse? If full-text indexing is beyond scope, here’s a reasonable solution, implementable entirely within Django.