code: def init_registry_from_json(mongo, filename, clear_collection=False):
      
      # Read model definition file (JSON)
      with open(filename, 'r') as f:
          models = json.load(f)
      init_registry(mongo, models, clear_collection)
docs: Initialize a model registry with a list of model definitions that are
      stored in a given file in Json format.
  
      Parameters
      ----------
      mongo : scodata.MongoDBFactory
          Connector for MongoDB
      filename : string
          Path to file containing model definitions
      clear_collection : boolean
          If true, collection will be dropped before models are created