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# -*- coding: utf-8 -*- |
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from math import ceil |
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from pyramid.httpexceptions import HTTPBadRequest |
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from webob.multidict import MultiDict |
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def validate_params(params, valid_keys, fail_on_invalid_key=True): |
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p = MultiDict() |
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for k, v in params.items(): |
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if k in valid_keys: |
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p.add(k, v) |
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elif fail_on_invalid_key: |
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raise HTTPBadRequest('invalid search parameter') |
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return p |
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def get_valid_params(params, valid_keys): |
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return validate_params(params, valid_keys, fail_on_invalid_key=False) |
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def parse_sort_string(sort): |
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""" |
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Parse a sort string for use with elasticsearch |
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:param: sort: the sort string |
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""" |
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if sort is None: |
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return ['_score'] |
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l = sort.rsplit(',') |
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sortlist = [] |
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for se in l: |
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se = se.strip() |
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order = 'desc' if se[0:1] == '-' else 'asc' |
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field = se[1:] if se[0:1] in ['-', '+'] else se |
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field = field.strip() |
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sortlist.append({field: {"order": order, "unmapped_type": "string", "missing": "_last"}}) |
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sortlist.append('_score') |
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return sortlist |
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def parse_filter_params(query_params, filterable): |
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""" |
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Parse query_params to a filter params dict. Merge multiple values for one key to a list. |
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Filter out keys that aren't filterable. |
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:param query_params: query params |
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:param filterable: list of filterable keys |
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:return: dict of filter values |
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""" |
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if query_params is not None: |
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filter_params = {} |
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for fq in query_params.mixed(): |
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if fq in filterable: |
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filter_params[fq] = query_params.mixed().get(fq) |
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return filter_params |
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else: |
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return {} |
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class SearchResultPager(object): |
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"""based on http://atlas-core.readthedocs.org/en/latest/_modules/flask_sqlalchemy.html Pagination""" |
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def __init__(self, page, per_page, total_count): |
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self.page = page |
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self.per_page = per_page |
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self.total_count = total_count |
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@property |
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def pages(self): |
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return int(ceil(self.total_count / float(self.per_page))) |
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@property |
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def has_prev(self): |
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return self.page > 1 |
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@property |
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def prev(self): |
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return self.page - 1 if self.has_prev else None |
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@property |
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def has_next(self): |
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return self.page < self.pages |
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@property |
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def next(self): |
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return self.page + 1 if self.has_next else None |
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def iter_pages( |
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self, left_edge=2, left_current=2, |
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right_current=5, right_edge=2 |
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): |
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"""Iterates over the page numbers in the pagination. The four |
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parameters control the thresholds how many numbers should be produced |
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from the sides. Skipped page numbers are represented as `None`. |
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""" |
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last = 0 |
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try: |
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xrange |
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except NameError: |
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xrange = range |
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for num in xrange(1, self.pages + 1): |
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if ( |
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num <= left_edge or |
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(self.page - left_current - 1 < num < self.page + right_current) |
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or num > self.pages - right_edge |
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): |
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if last + 1 != num: |
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yield None |
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yield num |
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last = num |
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OnroerendErfgoed /
oe_utils
