1 import haystack.backends.solr_backend
2 from haystack.query import SearchQuerySet, RelatedSearchQuerySet
3 from haystack.constants import ID, DJANGO_CT, DJANGO_ID
4 from haystack.utils import get_identifier
5 from haystack.backends import EmptyResults
7 from pysolr import SolrError
9 from django import forms
10 from django.conf import settings
11 from django.utils.translation import ugettext_lazy as _
13 from emissions.models import Emission, Episode, NewsItem, SoundFile
16 class MoreLikeThisSearchQuerySet(SearchQuerySet):
17 def more_like_this(self, model_instance, **kwargs):
19 clone.query.more_like_this(model_instance, **kwargs)
23 class CustomSolrSearchQuery(haystack.backends.solr_backend.SolrSearchQuery):
24 def more_like_this(self, model_instance, **kwargs):
25 self._more_like_this = True
26 self._mlt_instance = model_instance
28 def run_mlt(self, **kwargs):
29 """Builds and executes the query. Returns a list of search results."""
30 if self._more_like_this is False or self._mlt_instance is None:
31 raise MoreLikeThisError("No instance was provided to determine 'More Like This' results.")
33 additional_query_string = self.build_query()
35 'start_offset': self.start_offset,
36 'result_class': self.result_class,
37 'models': self.models,
41 if self.end_offset is not None:
42 search_kwargs['end_offset'] = self.end_offset - self.start_offset
44 results = self.backend.more_like_this(self._mlt_instance, additional_query_string, **search_kwargs)
45 self._results = results.get('results', [])
46 self._hit_count = results.get('hits', 0)
49 class CustomSolrSearchBackend(haystack.backends.solr_backend.SolrSearchBackend):
50 def more_like_this(self, model_instance, additional_query_string=None,
51 start_offset=0, end_offset=None, models=None,
52 limit_to_registered_models=None, result_class=None, **kwargs):
53 from haystack import connections
55 # Deferred models will have a different class ("RealClass_Deferred_fieldname")
56 # which won't be in our registry:
57 model_klass = model_instance._meta.concrete_model
59 index = connections[self.connection_alias].get_unified_index().get_index(model_klass)
60 field_name = index.get_content_field()
63 'mlt.fl': 'text,title',
64 'mlt.qf': 'text^0.3 tags^2.0 title^1.0',
67 if start_offset is not None:
68 params['start'] = start_offset
70 if end_offset is not None:
71 params['rows'] = end_offset
73 narrow_queries = set()
75 if limit_to_registered_models is None:
76 limit_to_registered_models = getattr(settings, 'HAYSTACK_LIMIT_TO_REGISTERED_MODELS', True)
78 if models and len(models):
79 model_choices = sorted(['%s.%s' % (model._meta.app_label, model._meta.module_name) for model in models])
80 elif limit_to_registered_models:
81 # Using narrow queries, limit the results to only models handled
82 # with the current routers.
83 model_choices = self.build_models_list()
87 if len(model_choices) > 0:
88 if narrow_queries is None:
89 narrow_queries = set()
91 narrow_queries.add('%s:(%s)' % (DJANGO_CT, ' OR '.join(model_choices)))
93 if additional_query_string:
94 narrow_queries.add(additional_query_string)
97 params['fq'] = list(narrow_queries)
99 query = "%s:%s" % (ID, get_identifier(model_instance))
102 raw_results = self.conn.more_like_this(query, field_name, **params)
103 except (IOError, SolrError) as e:
104 if not self.silently_fail:
107 self.log.error("Failed to fetch More Like This from Solr for document '%s': %s", query, e)
108 raw_results = EmptyResults()
110 return self._process_results(raw_results, result_class=result_class)
113 haystack.backends.solr_backend.SolrEngine.query = CustomSolrSearchQuery
114 haystack.backends.solr_backend.SolrEngine.backend = CustomSolrSearchBackend
116 import haystack.views
117 from haystack.views import search_view_factory, FacetedSearchView
118 from haystack.forms import FacetedSearchForm, SearchForm
121 class GlobalSearchForm(FacetedSearchForm):
122 def no_query_found(self):
123 sqs = super(GlobalSearchForm, self).no_query_found()
124 if self.selected_facets:
125 sqs = self.searchqueryset.all()
126 for facet in self.selected_facets:
129 field, value = facet.split(":", 1)
131 sqs = sqs.narrow(u'%s:"%s"' % (field, sqs.query.clean(value)))
135 class SearchView(FacetedSearchView):
136 def extra_context(self):
137 context = super(SearchView, self).extra_context()
138 context['sectionName'] = 'Search'
139 if self.request.GET.getlist('selected_facets'):
140 context['facets_qs'] = '&selected_facets=' + '&'.join(self.request.GET.getlist('selected_facets'))
141 context['selected_categories'] = [
142 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
143 if x.startswith('categories_exact')]
144 context['selected_tags'] = [
145 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
146 if x.startswith('tags_exact')]
147 if 'categories' in context['facets'].get('fields', []):
148 context['facets']['fields']['categories'] = [x for x in
149 context['facets']['fields']['categories'] if x[1] > 0]
150 context['facets']['fields']['categories'].sort()
151 if 'tags' in context['facets'].get('fields', []):
152 context['facets']['fields']['tags'] = [x for x in
153 context['facets']['fields']['tags'] if x[1] > 0]
156 sqs = SearchQuerySet().models(Emission, Episode, NewsItem).facet('categories').facet('tags')
158 view = search_view_factory(SearchView,
159 form_class=GlobalSearchForm,
164 class ListenArchivesForm(FacetedSearchForm):
165 q = forms.CharField(required=False, label='')
167 def no_query_found(self):
168 return self.searchqueryset.all()
171 sqs = super(ListenArchivesForm, self).search()
172 return sqs.load_all()
175 class ListenArchivesView(FacetedSearchView):
176 template = 'listen/archives.html'
179 sqs = RelatedSearchQuerySet().models(SoundFile).facet('format').facet('tags').order_by('-date')
180 super(ListenArchivesView, self).__init__(searchqueryset=sqs,
181 form_class=ListenArchivesForm, results_per_page=20)
183 def extra_context(self):
184 context = super(ListenArchivesView, self).extra_context()
185 context['sectionName'] = "Listen"
186 if self.request.GET.getlist('selected_facets'):
187 context['facets_qs'] = '&selected_facets=' + '&'.join(self.request.GET.getlist('selected_facets'))
188 context['selected_format'] = [
189 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
190 if x.startswith('format_exact')]
191 context['selected_tags'] = [
192 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
193 if x.startswith('tags_exact')]
194 if 'format' in context['facets'].get('fields', []):
195 context['facets']['fields']['format'] = [x for x in
196 context['facets']['fields']['format'] if x[1] > 0]
197 context['facets']['fields']['format'].sort()
198 if 'tags' in context['facets'].get('fields', []):
199 context['facets']['fields']['tags'] = [x for x in
200 context['facets']['fields']['tags'] if x[1] > 0]
203 listenArchives = search_view_factory(ListenArchivesView)
206 class NewsArchivesForm(FacetedSearchForm):
207 q = forms.CharField(required=False, label='')
209 def no_query_found(self):
210 return self.searchqueryset.all()
213 sqs = super(NewsArchivesForm, self).search()
214 return sqs.load_all()
217 class NewsArchivesView(FacetedSearchView):
218 template = 'news/archives.html'
221 sqs = RelatedSearchQuerySet().models(NewsItem).facet('news_categories').facet('tags').order_by('-date')
222 super(NewsArchivesView, self).__init__(searchqueryset=sqs,
223 form_class=NewsArchivesForm, results_per_page=20)
225 def extra_context(self):
226 context = super(NewsArchivesView, self).extra_context()
227 if self.request.GET.getlist('selected_facets'):
228 context['facets_qs'] = '&selected_facets=' + '&'.join(self.request.GET.getlist('selected_facets'))
229 context['sectionName'] = 'News'
230 context['selected_news_categories'] = [
231 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
232 if x.startswith('news_categories_exact')]
233 context['selected_tags'] = [
234 x.split(':', 1)[1] for x in self.request.GET.getlist('selected_facets')
235 if x.startswith('tags_exact')]
236 if 'news_categories' in context['facets'].get('fields', []):
237 context['facets']['fields']['news_categories'] = [x for x in
238 context['facets']['fields']['news_categories'] if x[1] > 0]
239 context['facets']['fields']['news_categories'].sort()
240 if 'tags' in context['facets'].get('fields', []):
241 context['facets']['fields']['tags'] = [x for x in
242 context['facets']['fields']['tags'] if x[1] > 0]
245 newsArchives = search_view_factory(NewsArchivesView)