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August 29, 2015 14:06
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DocumentFormatter for flattening documents for use in Solr. Does not include array indices.
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| from mongo_connector.doc_managers.formatters import DocumentFlattener | |
| class DocumentFlattenerUnordered(DocumentFlattener): | |
| """Formatter that completely flattens documents, but does not unwind arrays. | |
| Order of elements within arrays is not recorded. | |
| An example: | |
| {"a": 2, | |
| "b": { | |
| "c": { | |
| "d": 5 | |
| } | |
| }, | |
| "e": [6, 7, 8] | |
| } | |
| becomes: | |
| {"a": 2, "b.c.d": 5, "e": [6, 7, 8]} | |
| """ | |
| def transform_element(self, key, value): | |
| if isinstance(value, list): | |
| result = {} | |
| for lv in value: | |
| for inner_k, inner_v in self.transform_element(key, lv): | |
| inner_l = result.get(inner_k, []) | |
| if isinstance(inner_v, list): | |
| inner_l.extend(inner_v) | |
| else: | |
| inner_l.append(inner_v) | |
| result[inner_k] = inner_l | |
| for k in result: | |
| yield k, result[k] | |
| else: | |
| parent = super(DocumentFlattenerUnordered, self) | |
| for k, v in parent.transform_element(key, value): | |
| yield k, v |
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