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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _create_models_for_relation_step(self, rel_model_name, rel_key, rel_value, model):
 """ Create a new model linked to the given model. Syntax: And `model` with `field` "`value`" has `new model` in the database: Example: .. code-block:: gherkin And project with name "Ball Project" has goals in the database: | description | | To have fun playing with balls of twine | """


    model = get_model(model)
    lookup = {rel_key: rel_value}
    rel_model = get_model(rel_model_name).objects.get(**lookup)

    data = guess_types(self.hashes)

    for hash_ in data:
        hash_['%s' % rel_model_name] = rel_model

    try:
        func = _WRITE_MODEL[model]
    except KeyError:
        func = partial(write_models, model)

    func(data, None)