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Source code for galaxy.managers.taggable

"""
Mixins for Taggable model managers and serializers.
"""

# from galaxy import exceptions as galaxy_exceptions

import logging

from sqlalchemy import sql

from galaxy import model
from galaxy.util import unicodify

log = logging.getLogger(__name__)


# TODO: work out the relation between serializers and managers and then fold these into the parent of the two
def _tag_str_gen(item):
    # TODO: which user is this? all?
    for tag in item.tags:
        tag_str = tag.user_tname
        if tag.value is not None:
            tag_str += ":" + tag.user_value
        yield tag_str


def _tags_to_strings(item):
    if not hasattr(item, 'tags'):
        return None
    return sorted(list(_tag_str_gen(item)))


def _tags_from_strings(item, tag_handler, new_tags_list, user=None):
    # TODO: have to assume trans.user here...
    if not user:
        # raise galaxy_exceptions.RequestParameterMissingException( 'User required for tags on ' + str( item ) )
        # TODO: this becomes a 'silent failure' - no tags are set. This is a questionable approach but
        # I haven't found a better one for anon users copying items with tags
        return
    # TODO: duped from tags manager - de-dupe when moved to taggable mixin
    tag_handler.delete_item_tags(user, item)
    new_tags_str = ','.join(new_tags_list)
    tag_handler.apply_item_tags(user, item, unicodify(new_tags_str, 'utf-8'))
    # TODO:!! does the creation of new_tags_list mean there are now more and more unused tag rows in the db?


[docs]class TaggableManagerMixin(object): #: class of TagAssociation (e.g. HistoryTagAssociation) tag_assoc = None # TODO: most of this can be done by delegating to the GalaxyTagHandler?
[docs] def get_tags(self, item): """ Return a list of tag strings. """ return _tags_to_strings(item)
[docs] def set_tags(self, item, new_tags, user=None): """ Set an `item`'s tags from a list of strings. """ return _tags_from_strings(item, self.app.tag_handler, new_tags, user=user)
# def tags_by_user( self, user, **kwargs ): # TODO: here or GalaxyTagHandler # pass
[docs]class TaggableSerializerMixin(object):
[docs] def add_serializers(self): self.serializers['tags'] = self.serialize_tags
[docs] def serialize_tags(self, item, key, **context): """ Return tags as a list of strings. """ return _tags_to_strings(item)
[docs]class TaggableDeserializerMixin(object):
[docs] def add_deserializers(self): self.deserializers['tags'] = self.deserialize_tags
[docs] def deserialize_tags(self, item, key, val, user=None, **context): """ Make sure `val` is a valid list of tag strings and assign them. Note: this will erase any previous tags. """ new_tags_list = self.validate.basestring_list(key, val) _tags_from_strings(item, self.app.tag_handler, new_tags_list, user=user) return item.tags
[docs]class TaggableFilterMixin(object): valid_ops = ('eq', 'contains', 'has')
[docs] def create_tag_filter(self, attr, op, val): def _create_tag_filter(model_class=None): if op not in TaggableFilterMixin.valid_ops: self.raise_filter_err(attr, op, val, 'bad op in filter') if model_class is None: return True class_name = model_class.__name__ if class_name == 'HistoryDatasetCollectionAssociation': # Unfortunately we were a little inconsistent with out naming scheme class_name = 'HistoryDatasetCollection' target_model = getattr(model, "%sTagAssociation" % class_name) id_column = "%s_id" % target_model.table.name.rsplit('_tag_association')[0] column = target_model.table.c.user_tname + ":" + target_model.table.c.user_value if op == 'eq': if ':' not in val: # We require an exact match and the tag to look for has no user_value, # so we can't just concatenate user_tname, ':' and user_vale cond = target_model.table.c.user_tname == val else: cond = column == val else: cond = column.contains(val, autoescape=True) return sql.expression.and_( model_class.table.c.id == getattr(target_model.table.c, id_column), cond ) return _create_tag_filter
def _add_parsers(self): self.orm_filter_parsers.update({ 'tag': self.create_tag_filter })