* ElasTag
A dictionary indexed by a dictionary, in Python.
Store objects associated to configurations defined as sets of key-value pairs. More restrictive configurations have more key-value pairs. Retrieve the object or objects for a given query configuration that corresponds to the most restrictive stored configuration that is a subset of the query.
(Sorry for the poor formatting of the example. Github sort of shows org-mode, but not when you add source. Take a look at the original file.)
Example:
#+begin_src python
>>> el = ElasTag()
>>> el[{'lang': 'es'}] = 'es'
>>> el[{'lang': 'en'}] = 'en'
>>> el[{'lang': 'en', 'sector': 'construction'}] = 'en-construction'
>>> el[{'lang': 'en', 'sector': 'consulting'}] = 'en-consulting'
>>> el[{'lang': 'en', 'company': 'comp'}] = 'en-comp'
>>> el[{'lang': 'en', 'company': 'comp',
... 'sector': 'construction'}] = 'en-comp-construction'
>>> print el[{'lang': 'es'}]
es
>>> print el[{'lang': 'en', 'sector': 'construction'}]
en-construction
>>> print el[{'lang': 'en', 'sector': 'construction',
... 'company': 'comp'}]
en-comp-construction
>>> try:
... print el[{'lang': 'ca'}]
... except KeyError:
... print 'no ca'
no ca
>>> ## lang:en is the most specific configuration defined that is a subset
>>> ## of the following query:
>>> print el[{'lang': 'en', 'sector': 'retail'}]
en
>>> try:
... print el[{'sector': 'retail'}]
... except KeyError:
... print 'no retail without lang'
no retail without lang
>>> print {'lang': 'en', 'sector': 'construction'} in el
True
>>> ## This checks for elastic inclusion, and finds lang:en
>>> print {'lang': 'en', 'sector': 'retail'} in el
True
>>> ## This checks for exact inclusion, and does not find it.
>>> print el.haskey({'lang': 'en', 'sector': 'retail'})
False
>>> print el.haskey({'lang': 'en', 'sector': 'construction'})
True
>>> el.append({'lang': 'en', 'sector': 'construction'}, 'en-const-appended')
['en-construction', 'en-const-appended']
>>> el[{'lang': 'en', 'sector': 'construction'}]
['en-construction', 'en-const-appended']
>>> el.append({'lang': 'en', 'sector': 'retail'}, 'en-retail')
['en-retail']
>>> el.append({'lang': 'en', 'sector': 'retail'}, 'en-ret-appended')
['en-retail', 'en-ret-appended']
>>> el.all({'lang': 'en'})
['en', 'en-comp', 'en-consulting', 'en-retail', 'en-ret-appended',
'en-construction', 'en-const-appended', 'en-comp-construction']
>>> el.all({'lang': 'en', 'sector': 'construction'})
['en-construction', 'en-const-appended', 'en-comp-construction']
>>> len(el.all())
9
#+end_src