def write_tweets_to_mongo():
""" load tweets, decide the grid of tweets and insert the tweets into mongo
this function serves as the initial step of the pipeline.
all following db-specific operations are based on the dataset inserted here.
This function is only called once for the entire pipeline.
"""
data_file = "data/sandy_all.txt"
kml_file = ["data/nj_ct.kml", "data/nyc_ct_sea.kml"]
# kml_file = ['data/nyc_cb_sea.kml']
tweets = load_tweets(data_file)
# trajectories = tweets_to_trajectories(tweets)
grid_db = GridDB()
grid_db.load_grid_from_file(kml_file[0])
grid_db.load_grid_from_file(kml_file[1])
# grid_db.write_grids_to_json('shapefile.json')
grid_db.check_and_add(tweets)
#####################################################
############## index Tweets into MongoDB ############
#####################################################
# mongodb
mg = MongoDB()
mg.connect()
print("connected...")
mg.drop()
# tweets to dicts;
rst = []
for t in grid_db.get_tweets():
rst.append(t.to_dict())
print("inserting...")
mg.insert_tweets(rst)
