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annotate custom_search/fields.py @ 1096:d9cd3180c12c
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| author | Brian Neal <bgneal@gmail.com> |
|---|---|
| date | Tue, 14 Jun 2016 21:16:09 -0500 |
| parents | cf9918328c64 |
| children |
| rev | line source |
|---|---|
| bgneal@943 | 1 """Custom Haystack SearchFields.""" |
| bgneal@943 | 2 |
| bgneal@943 | 3 import haystack.fields |
| bgneal@943 | 4 |
| bgneal@943 | 5 |
| bgneal@943 | 6 class MaxTermSizeCharField(haystack.fields.CharField): |
| bgneal@943 | 7 """A CharField that discards large terms when preparing the search index. |
| bgneal@943 | 8 |
| bgneal@943 | 9 Some backends (e.g. Xapian) throw errors when terms are bigger than some |
| bgneal@943 | 10 limit. This field omits the terms over a limit when preparing the data for |
| bgneal@943 | 11 the search index. |
| bgneal@943 | 12 |
| bgneal@943 | 13 The keyword argument max_term_size sets the maximum size of a whitespace |
| bgneal@943 | 14 delimited word/term. Terms over this size are not indexed. The default value |
| bgneal@943 | 15 is 64. |
| bgneal@943 | 16 """ |
| bgneal@943 | 17 DEFAULT_MAX_TERM_SIZE = 64 |
| bgneal@943 | 18 |
| bgneal@943 | 19 def __init__(self, *args, **kwargs): |
| bgneal@943 | 20 self.max_term_size = kwargs.pop('max_term_size', self.DEFAULT_MAX_TERM_SIZE) |
| bgneal@943 | 21 super(MaxTermSizeCharField, self).__init__(*args, **kwargs) |
| bgneal@943 | 22 |
| bgneal@943 | 23 def prepare(self, obj): |
| bgneal@943 | 24 text = super(MaxTermSizeCharField, self).prepare(obj) |
| bgneal@943 | 25 if text is None or self.max_term_size is None: |
| bgneal@943 | 26 return text |
| bgneal@943 | 27 |
| bgneal@943 | 28 terms = (term for term in text.split() if len(term) <= self.max_term_size) |
| bgneal@943 | 29 return u' '.join(terms) |