# Path: psqlextra/fields/hstore_field.py
# class HStoreField(DjangoHStoreField):
#     """Improved version of Django's :see:HStoreField that adds support for
#     database-level constraints.
# 
#     Notes:
#         - For the implementation of uniqueness, see the
#           custom database back-end.
#     """
# 
#     def __init__(
#         self,
#         *args,
#         uniqueness: Optional[List[Union[str, Tuple[str, ...]]]] = None,
#         required: Optional[List[str]] = None,
#         **kwargs
#     ):
#         """Initializes a new instance of :see:HStoreField.
# 
#         Arguments:
#             uniqueness:
#                 List of keys to enforce as unique. Use tuples
#                 to enforce multiple keys together to be unique.
# 
#             required:
#                 List of keys that should be enforced as required.
#         """
# 
#         super(HStoreField, self).__init__(*args, **kwargs)
# 
#         self.uniqueness = uniqueness
#         self.required = required
# 
#     def get_prep_value(self, value):
#         """Override the base class so it doesn't cast all values to strings.
# 
#         psqlextra supports expressions in hstore fields, so casting all
#         values to strings is a bad idea.
#         """
# 
#         value = Field.get_prep_value(self, value)
# 
#         if isinstance(value, dict):
#             prep_value = {}
#             for key, val in value.items():
#                 if isinstance(val, Expression):
#                     prep_value[key] = val
#                 elif val is not None:
#                     prep_value[key] = str(val)
#                 else:
#                     prep_value[key] = val
# 
#             value = prep_value
# 
#         if isinstance(value, list):
#             value = [str(item) for item in value]
# 
#         return value
# 
#     def deconstruct(self):
#         """Gets the values to pass to :see:__init__ when re-creating this
#         object."""
# 
#         name, path, args, kwargs = super(HStoreField, self).deconstruct()
# 
#         if self.uniqueness is not None:
#             kwargs["uniqueness"] = self.uniqueness
# 
#         if self.required is not None:
#             kwargs["required"] = self.required
# 
#         return name, path, args, kwargs


from psqlextra.fields import HStoreField

            self.remove_field(model, field)

    def alter_db_table(self, model, old_db_table, new_db_table):
        """Ran when the name of a model is changed."""

        for field in model._meta.local_fields:
            if not isinstance(field, HStoreField):
                continue

            for key in self._iterate_required_keys(field):
                self._rename_hstore_required(
                    old_db_table, new_db_table, field, field, key
                )

    def add_field(self, model, field):
        """Ran when a field is added to a model."""

        for key in self._iterate_required_keys(field):
            self._create_hstore_required(model._meta.db_table, field, key)

    def remove_field(self, model, field):
        """Ran when a field is removed from a model."""

        for key in self._iterate_required_keys(field):
            self._drop_hstore_required(model._meta.db_table, field, key)

    def alter_field(self, model, old_field, new_field, strict=False):
        """Ran when the configuration on a field changed."""


# Path: psqlextra/fields/hstore_field.py
# class HStoreField(DjangoHStoreField):
#     """Improved version of Django's :see:HStoreField that adds support for
#     database-level constraints.
# 
#     Notes:
#         - For the implementation of uniqueness, see the
#           custom database back-end.
#     """
# 
#     def __init__(
#         self,
#         *args,
#         uniqueness: Optional[List[Union[str, Tuple[str, ...]]]] = None,
#         required: Optional[List[str]] = None,
#         **kwargs
#     ):
#         """Initializes a new instance of :see:HStoreField.
# 
#         Arguments:
#             uniqueness:
#                 List of keys to enforce as unique. Use tuples
#                 to enforce multiple keys together to be unique.
# 
#             required:
#                 List of keys that should be enforced as required.
#         """
# 
#         super(HStoreField, self).__init__(*args, **kwargs)
# 
#         self.uniqueness = uniqueness
#         self.required = required
# 
#     def get_prep_value(self, value):
#         """Override the base class so it doesn't cast all values to strings.
# 
#         psqlextra supports expressions in hstore fields, so casting all
#         values to strings is a bad idea.
#         """
# 
#         value = Field.get_prep_value(self, value)
# 
#         if isinstance(value, dict):
#             prep_value = {}
#             for key, val in value.items():
#                 if isinstance(val, Expression):
#                     prep_value[key] = val
#                 elif val is not None:
#                     prep_value[key] = str(val)
#                 else:
#                     prep_value[key] = val
# 
#             value = prep_value
# 
#         if isinstance(value, list):
#             value = [str(item) for item in value]
# 
#         return value
# 
#     def deconstruct(self):
#         """Gets the values to pass to :see:__init__ when re-creating this
#         object."""
# 
#         name, path, args, kwargs = super(HStoreField, self).deconstruct()
# 
#         if self.uniqueness is not None:
#             kwargs["uniqueness"] = self.uniqueness
# 
#         if self.required is not None:
#             kwargs["required"] = self.required
# 
#         return name, path, args, kwargs


# Path: psqlextra/backend/side_effects/hstore_required.py
from psqlextra.fields import HStoreField


            self.remove_field(model, field)

    def alter_db_table(self, model, old_db_table, new_db_table):
        """Ran when the name of a model is changed."""

        for field in model._meta.local_fields:
            if not isinstance(field, HStoreField):
                continue

            for key in self._iterate_required_keys(field):
                self._rename_hstore_required(
                    old_db_table, new_db_table, field, field, key
                )

    def add_field(self, model, field):
        """Ran when a field is added to a model."""

        for key in self._iterate_required_keys(field):
            self._create_hstore_required(model._meta.db_table, field, key)

    def remove_field(self, model, field):
        """Ran when a field is removed from a model."""

        for key in self._iterate_required_keys(field):
            self._drop_hstore_required(model._meta.db_table, field, key)

    def alter_field(self, model, old_field, new_field, strict=False):
        """Ran when the configuration on a field changed."""


        is_old_field_hstore = isinstance(old_field, HStoreField)