def tileSet_from_yaml(mapName):
""" Import a TileSet and related models from a YAML file.
Example:
>>> ts = tileSet_from_yaml('stlhom')
>>> ts.name
'stlhom'
>>> import models
>>> t = models.TileSet.get_by_key_name('ts:stlhom')
>>> t.name
'stlhom'
>>> t.overview
'o:stlhom'
>>> t.ids
'tsids:stlhom'
"""
from dynTileMapper.dtm_wsgi.models import TileSet,Overview,TileSet_IDS
ymlfile = os.path.join(MAP_FILE_HOME,mapName,'dtm.yaml')
m = yaml.load(open(ymlfile).read())
overview = Overview(key_name='o:'+m.name)
overview.typ = m.overview_typ
overview.dat = base64.b64decode(m.overview_dat)
overview.width = m.overview_width
overview.height = m.overview_height
overview_key = overview.put()
tsids = TileSet_IDS(key_name='tsids:'+m.name)
tsids.ids = zlib.compress(m.ids)
tsids_key = tsids.put()
tile_set = TileSet(key_name='ts:'+m.name)
tile_set.public = True
tile_set.name = m.name
tile_set.notes = m.notes
tile_set.source = m.source
tile_set.idName = m.variableNames[m.idVariable]
tile_set.idlen = len(m.ids.split(','))
tile_set.cLng = m.cLng
tile_set.cLat = m.cLat
tile_set.minx = m.minx
tile_set.miny = m.miny
tile_set.maxx = m.maxx
tile_set.maxy = m.maxy
tile_set.GMERC_BOUNDS = m.gmerc_bounds
tile_set.maxZoom = 20
tile_set.overview = overview_key
tile_set.ids = tsids_key
tile_set.put()
return tile_set
