85 lines
3 KiB
Python
85 lines
3 KiB
Python
# Copyright The IETF Trust 2014-2019, All Rights Reserved
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# -*- coding: utf-8 -*-
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from __future__ import absolute_import, print_function, unicode_literals
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import json
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import six
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from django.utils.html import escape
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from django import forms
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from django.urls import reverse as urlreverse
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from ietf.liaisons.models import LiaisonStatement
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def select2_id_liaison_json(objs):
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return json.dumps([{ "id": o.pk, "text":"[{}] {}".format(o.pk, escape(o.title)) } for o in objs])
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def select2_id_group_json(objs):
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return json.dumps([{ "id": o.pk, "text": escape(o.acronym) } for o in objs])
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class SearchableLiaisonStatementsField(forms.CharField):
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"""Server-based multi-select field for choosing liaison statements using
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select2.js."""
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def __init__(self,
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max_entries = None,
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hint_text="Type in title to search for document",
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model = LiaisonStatement,
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*args, **kwargs):
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kwargs["max_length"] = 10000
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self.model = model
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self.max_entries = max_entries
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super(SearchableLiaisonStatementsField, self).__init__(*args, **kwargs)
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self.widget.attrs["class"] = "select2-field form-control"
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self.widget.attrs["data-placeholder"] = hint_text
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if self.max_entries != None:
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self.widget.attrs["data-max-entries"] = self.max_entries
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def parse_select2_value(self, value):
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return [x.strip() for x in value.split(",") if x.strip()]
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def check_pks(self, pks):
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for pk in pks:
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if not pk.isdigit():
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raise forms.ValidationError("Unexpected value: %s" % pk)
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return pks
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def prepare_value(self, value):
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if not value:
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value = ""
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if isinstance(value, six.integer_types):
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value = str(value)
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if isinstance(value, six.string_types):
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pks = self.parse_select2_value(value)
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value = self.model.objects.filter(pk__in=pks)
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if isinstance(value, LiaisonStatement):
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value = [value]
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self.widget.attrs["data-pre"] = select2_id_liaison_json(value)
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# doing this in the constructor is difficult because the URL
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# patterns may not have been fully constructed there yet
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self.widget.attrs["data-ajax-url"] = urlreverse("ietf.liaisons.views.ajax_select2_search_liaison_statements")
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return ",".join(six.text_type(o.pk) for o in value)
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def clean(self, value):
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value = super(SearchableLiaisonStatementsField, self).clean(value)
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pks = self.check_pks(self.parse_select2_value(value))
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objs = self.model.objects.filter(pk__in=pks)
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found_pks = [str(o.pk) for o in objs]
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failed_pks = [x for x in pks if x not in found_pks]
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if failed_pks:
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raise forms.ValidationError("Could not recognize the following groups: {pks}.".format(pks=", ".join(failed_pks)))
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if self.max_entries != None and len(objs) > self.max_entries:
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raise forms.ValidationError("You can select at most %s entries only." % self.max_entries)
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return objs
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