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class QueryBuilder: |
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def __init__(self, query_params=None, es_version='1'): |
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""" |
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Creates a query builder |
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:param query_params: dict with query parameters |
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""" |
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self.es_version = es_version |
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self.query_params = query_params |
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self.query = self._build_initial_query_string() |
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self.filters = [] |
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def _build_initial_query_string(self): |
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if self.query_params is None or 'query' not in self.query_params or self.query_params['query'] == '': |
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return { |
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'match_all': {} |
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} |
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else: |
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all_fields = '_all' if self.es_version == '1' else '*' |
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return { |
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'query_string': { |
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'default_field': all_fields, |
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'query': self.query_params['query'] |
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} |
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} |
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def add_named_concept_filters(self, named_filter_concepts): |
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""" |
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Adds named concept filters |
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:param named_filter_concepts: dict with named filter concepts which will be mapped as the key as query param and the value as search string |
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""" |
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for concept_key, concept_name in named_filter_concepts.items(): |
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self.add_concept_filter(concept_key, concept_name=concept_name) |
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def add_concept_filters(self, filter_concepts): |
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""" |
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Adds concept filters |
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:param filter_concepts: list with filter concepts |
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""" |
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for concept in filter_concepts: |
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self.add_concept_filter(concept) |
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def add_concept_filter(self, concept, concept_name=None): |
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""" |
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Add a concept filter |
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:param concept: concept which will be used as lowercase string in a search term |
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:param concept_name: name of the place where there will be searched for |
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""" |
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if concept in self.query_params.keys(): |
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if not concept_name: |
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concept_name = concept |
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if isinstance(self.query_params[concept], list): |
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if self.es_version == '1': |
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es_filter = {'or': []} |
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for or_filter in self.query_params[concept]: |
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es_filter['or'].append(self._build_concept_term(concept_name, or_filter)) |
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else: |
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es_filter = {"bool": {"should": []}} |
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for or_filter in self.query_params[concept]: |
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es_filter["bool"]["should"].append(self._build_concept_term(concept_name, or_filter)) |
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else: |
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es_filter = self._build_concept_term(concept_name, self.query_params[concept]) |
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self.filters.append(es_filter) |
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@staticmethod |
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def _build_concept_term(concept_name, concept): |
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return { |
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'term': {concept_name: str(concept).lower()} |
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} |
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def build(self): |
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""" |
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Builds the query string, which can be used for a search query |
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:return: the query string |
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""" |
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if self.es_version == '1': |
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if len(self.filters) > 0: |
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return { |
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'filtered': { |
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'query': self.query, |
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'filter': { |
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'and': self.filters |
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} |
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} |
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} |
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else: |
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return self.query |
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else: |
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query = { |
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'bool': { |
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'must': self.query |
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} |
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} |
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if len(self.filters) > 0: |
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query["bool"]["filter"] = self.filters |
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return query |
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OnroerendErfgoed /
oe_utils
