def add_nodes(request):
"""
Add nodes to a new child phase
"""
session = DBSession()
phase = get_object_or_404(Phase, request, ('phase_id', 'id'))
child_phase = Phase(phase.scenario, phase)
new_nodes = []
for feature in request.json_body['features']:
# assumes point geom
coords = feature['geometry']['coordinates']
shp_pt = shapely.geometry.Point(coords[0], coords[1])
wkb_geom = from_shape(shp_pt, srid=BASE_SRID)
type_property = feature['properties']['type']
weight = feature['properties']['weight']
node_type = get_node_type(type_property, session)
node = Node(wkb_geom, weight, node_type, child_phase)
new_nodes.append(node)
session.add_all(new_nodes)
session.flush()
child_phase.create_edges()
return json_response(
{'scenario_id': child_phase.scenario_id,
'phase_id': child_phase.id}
)
def create_supply_nodes(request):
"""
Create new supply based on distance and re-create the nearest neighbor edges.
Create a new child phase of the phase passed in
Display the new output
"""
session = DBSession()
phase = get_object_or_404(Phase, request, ('phase_id', 'id'))
child_phase = Phase(phase.scenario, phase)
session.add(child_phase)
session.flush() #flush this so object has all id's
distance = float(request.json_body.get('d', 1000))
num_supply_nodes = int(request.json_body.get('n', 1))
centroids = child_phase.locate_supply_nodes(distance, num_supply_nodes, session)
session.add_all(centroids)
# need to flush so that create_edges knows about new nodes
session.flush()
child_phase.create_edges()
return json_response(
{'scenario_id': child_phase.scenario_id,
'phase_id': child_phase.id}
)
def create_scenario(request):
"""
Bulk load the nodes from the demand and supply csv's
"""
if(request.method=='POST'):
session = DBSession()
dbapi_conn = session.connection().connection
sc = phase = None
try:
demand_type = get_node_type('demand', session)
supply_type = get_node_type('supply', session)
name = request.POST['name']
# make sure that we have a name
assert len(name) != 0
sc = Scenario(name)
session.add(sc)
session.flush()
# add the root phase to the scenario
phase = Phase(sc)
session.add(phase)
session.flush()
demand_file = request.POST['demand-csv']
supply_file = request.POST['supply-csv']
tmp_demand_file = os.path.join(
request.registry.settings['next.temporary_folder'],
demand_file.filename
)
tmp_supply_file = os.path.join(
request.registry.settings['next.temporary_folder'],
supply_file.filename
)
write_tmp_file(demand_file, tmp_demand_file)
write_tmp_file(supply_file, tmp_supply_file)
in_demand_stream = open(tmp_demand_file, 'rU')
in_supply_stream = open(tmp_supply_file, 'rU')
import_nodes(dbapi_conn, in_demand_stream,
demand_type.id, sc.id, phase.id)
import_nodes(dbapi_conn, in_supply_stream,
supply_type.id, sc.id, phase.id)
except Exception as error:
raise(error)
# send the user to the run scenario page right now
# at this point, we should have the scenario/phase,
# so create the edges
# session.commit()
phase.create_edges()
return HTTPFound(
location=request.route_url('show-phase', id=sc.id, phase_id=phase.id))
elif request.method == 'GET':
return {}
else:
raise HTTPForbidden()