Fixed and replaced the incorrect class property declaration with the instance property declaration, and replaced unnecessary pseudo properties with instance properties.

accounting/models.py

@@ -51,10 +51,17 @@ class Account(models.Model):
         db_column="updatedby",
         related_name="updated_accounting_accounts")
 
+    def __init__(self, *args, **kwargs):
+        super(Account, self).__init__(*args, **kwargs)
+        self.url = None
+
     def __str__(self):
         """Returns the string representation of this account."""
         return self.code.__str__() + " " + self.title
 
+    class Meta:
+        db_table = "accounting_accounts"
+
     @property
     def title(self):
         return get_multi_lingual_attr(self, "title")
@@ -63,19 +70,6 @@ class Account(models.Model):
     def title(self, value):
         set_multi_lingual_attr(self, "title", value)
 
-    _url = None
-
-    @property
-    def url(self):
-        return self._url
-
-    @url.setter
-    def url(self, value):
-        self._url = value
-
-    class Meta:
-        db_table = "accounting_accounts"
-
 
 class Transaction(models.Model):
     """An accounting transaction."""
@@ -96,7 +90,19 @@ class Transaction(models.Model):
         db_column="updatedby",
         related_name="updated_accounting_transactions")
 
-    _records = None
+    def __init__(self, *args, **kwargs):
+        super(Transaction, self).__init__(*args, **kwargs)
+        self._records = None
+        self._is_balanced = None
+        self._has_order_hole = None
+
+    def __str__(self):
+        """Returns the string representation of this accounting
+        transaction."""
+        return self.date.__str__() + " #" + self.ord.__str__()
+
+    class Meta:
+        db_table = "accounting_transactions"
 
     @property
     def records(self):
@@ -143,8 +149,6 @@ class Transaction(models.Model):
         return sum([x.amount for x in self.credit_records
                     if isinstance(x.amount, int)])
 
-    _is_balanced = None
-
     @property
     def is_balanced(self):
         """Whether the sum of the amounts of the debit records is the
@@ -165,8 +169,6 @@ class Transaction(models.Model):
         so that the user can sort their orders. """
         return Transaction.objects.filter(date=self.date).count() > 1
 
-    _has_order_hole = None
-
     @property
     def has_order_hole(self):
         """Whether the order of the transactions on this day is not
@@ -228,14 +230,6 @@ class Transaction(models.Model):
             return reverse(
                 "accounting:transactions.show", args=("transfer", self))
 
-    def __str__(self):
-        """Returns the string representation of this accounting
-        transaction."""
-        return self.date.__str__() + " #" + self.ord.__str__()
-
-    class Meta:
-        db_table = "accounting_transactions"
-
 
 class Record(models.Model):
     """An accounting record."""
@@ -262,94 +256,15 @@ class Record(models.Model):
         db_column="updatedby",
         related_name="updated_accounting_records")
 
-    _debit_amount = None
+    def __init__(self, *args, **kwargs):
-
+        super(Record, self).__init__(*args, **kwargs)
-    @property
+        self._debit_amount = None
-    def debit_amount(self):
+        self._credit_amount = None
-        """The debit amount of this accounting record"""
+        self._balance = None
-        if self._debit_amount is not None:
+        self._is_balanced = None
-            return self._debit_amount
+        self._has_order_hole = None
-        return self.amount if not self.is_credit else None
+        self._is_credit_card_paid = None
-
+        self._is_existing_equipment = None
-    @debit_amount.setter
-    def debit_amount(self, value):
-        self._debit_amount = value
-
-    _credit_amount = None
-
-    @property
-    def credit_amount(self):
-        """The credit amount of this accounting record"""
-        if self._credit_amount is not None:
-            return self._credit_amount
-        return self.amount if self.is_credit else None
-
-    @credit_amount.setter
-    def credit_amount(self, value):
-        self._credit_amount = value
-
-    _balance = None
-
-    @property
-    def balance(self):
-        return self._balance
-
-    @balance.setter
-    def balance(self, value):
-        self._balance = value
-
-    _is_balanced = None
-
-    @property
-    def is_balanced(self):
-        """Whether the transaction of this record is balanced. """
-        if self._is_balanced is None:
-            self._is_balanced = self.transaction.is_balanced
-        return self._is_balanced
-
-    @is_balanced.setter
-    def is_balanced(self, value):
-        self._is_balanced = value
-
-    _has_order_hole = None
-
-    @property
-    def has_order_hole(self):
-        """Whether the order of the transactions on this day is not
-        1, 2, 3, 4, 5..., and should be reordered. """
-        if self._has_order_hole is None:
-            self._has_order_hole = self.transaction.has_order_hole
-        return self._has_order_hole
-
-    @has_order_hole.setter
-    def has_order_hole(self, value):
-        self._has_order_hole = value
-
-    _is_credit_card_paid = None
-
-    @property
-    def is_credit_card_paid(self):
-        # TODO: To be done
-        if self._is_credit_card_paid is None:
-            self._is_credit_card_paid = True
-        return self._is_credit_card_paid
-
-    @is_credit_card_paid.setter
-    def is_credit_card_paid(self, value):
-        self._is_credit_card_paid = value
-
-    _is_existing_equipment = None
-
-    @property
-    def is_existing_equipment(self):
-        # TODO: To be done
-        if self._is_existing_equipment is None:
-            self._is_existing_equipment = False
-        return self._is_existing_equipment
-
-    @is_existing_equipment.setter
-    def is_existing_equipment(self, value):
-        self._is_existing_equipment = value
 
     def __str__(self):
         """Returns the string representation of this accounting
@@ -363,6 +278,81 @@ class Record(models.Model):
     class Meta:
         db_table = "accounting_records"
 
+    @property
+    def debit_amount(self):
+        """The debit amount of this accounting record"""
+        if self._debit_amount is not None:
+            return self._debit_amount
+        return self.amount if not self.is_credit else None
+
+    @debit_amount.setter
+    def debit_amount(self, value):
+        self._debit_amount = value
+
+    @property
+    def credit_amount(self):
+        """The credit amount of this accounting record"""
+        if self._credit_amount is not None:
+            return self._credit_amount
+        return self.amount if self.is_credit else None
+
+    @credit_amount.setter
+    def credit_amount(self, value):
+        self._credit_amount = value
+
+    @property
+    def balance(self):
+        return self._balance
+
+    @balance.setter
+    def balance(self, value):
+        self._balance = value
+
+    @property
+    def is_balanced(self):
+        """Whether the transaction of this record is balanced. """
+        if self._is_balanced is None:
+            self._is_balanced = self.transaction.is_balanced
+        return self._is_balanced
+
+    @is_balanced.setter
+    def is_balanced(self, value):
+        self._is_balanced = value
+
+    @property
+    def has_order_hole(self):
+        """Whether the order of the transactions on this day is not
+        1, 2, 3, 4, 5..., and should be reordered. """
+        if self._has_order_hole is None:
+            self._has_order_hole = self.transaction.has_order_hole
+        return self._has_order_hole
+
+    @has_order_hole.setter
+    def has_order_hole(self, value):
+        self._has_order_hole = value
+
+    @property
+    def is_credit_card_paid(self):
+        # TODO: To be done
+        if self._is_credit_card_paid is None:
+            self._is_credit_card_paid = True
+        return self._is_credit_card_paid
+
+    @is_credit_card_paid.setter
+    def is_credit_card_paid(self, value):
+        self._is_credit_card_paid = value
+
+    @property
+    def is_existing_equipment(self):
+        # TODO: To be done
+        if self._is_existing_equipment is None:
+            self._is_existing_equipment = False
+        return self._is_existing_equipment
+
+    @is_existing_equipment.setter
+    def is_existing_equipment(self, value):
+        self._is_existing_equipment = value
+
 
 class RecordSummary(models.Model):
     """A summary record."""
@@ -371,7 +361,14 @@ class RecordSummary(models.Model):
     debit = models.PositiveIntegerField()
     balance = models.IntegerField()
 
-    _label = None
+    def __init__(self, *args, **kwargs):
+        super(RecordSummary, self).__init__(*args, **kwargs)
+        self._label = None
+        self._cumulative_balance = None
+
+    class Meta:
+        db_table = None
+        managed = False
 
     @property
     def label(self):
@@ -383,8 +380,6 @@ class RecordSummary(models.Model):
     def label(self, value):
         self._label = value
 
-    _cumulative_balance = None
-
     @property
     def cumulative_balance(self):
         return self._cumulative_balance
@@ -392,7 +387,3 @@ class RecordSummary(models.Model):
     @cumulative_balance.setter
     def cumulative_balance(self, value):
         self._cumulative_balance = value
-
-    class Meta:
-        db_table = None
-        managed = False

accounting/utils.py

@@ -54,9 +54,6 @@ class ReportUrl:
         income_statement (str): The URL of the income statement.
         balance_sheet (str): The URL of the balance sheet.
     """
-    _period = None
-    _cash = None
-    _ledger = None
 
     def __init__(self, **kwargs):
         if "period" in kwargs:
@@ -74,37 +71,29 @@ class ReportUrl:
             self._ledger = Account.objects.get(
                 code=settings.ACCOUNTING["DEFAULT_LEDGER_ACCOUNT"])
 
-    @property
     def cash(self):
         return reverse(
             "accounting:cash", args=(self._cash, self._period))
 
-    @property
     def cash_summary(self):
         return reverse("accounting:cash-summary", args=(self._cash,))
 
-    @property
     def ledger(self):
         return reverse(
             "accounting:ledger", args=(self._ledger, self._period))
 
-    @property
     def ledger_summary(self):
         return reverse("accounting:ledger-summary", args=(self._ledger,))
 
-    @property
     def journal(self):
         return reverse("accounting:journal", args=(self._period,))
 
-    @property
     def trial_balance(self):
         return reverse("accounting:trial-balance", args=(self._period,))
 
-    @property
     def income_statement(self):
         return reverse("accounting:income-statement", args=(self._period,))
 
-    @property
     def balance_sheet(self):
         return reverse("accounting:balance-sheet", args=(self._period,))
 
@@ -118,7 +107,6 @@ class Populator:
     Attributes:
         user (User): The user in action.
     """
-    user = None
 
     def __init__(self, user):
         self.user = user

mia_core/period.py

@@ -77,10 +77,6 @@ class Period:
         month_picker_params (str): The month-picker parameters, as a
                                    JSON text string
     """
-    _period = None
-    _data_start = None
-    _data_end = None
-
     def __init__(self, spec=None, data_start=None, data_end=None):
         self._period = self.Parser(spec)
         self._data_start = data_start
@@ -337,13 +333,13 @@ class Period:
             error (str): The period specification format error, or
                          None on success.
         """
-        spec = None
-        start = None
-        end = None
-        description = None
-        error = None
-
         def __init__(self, spec):
+            self.spec = None
+            self.start = None
+            self.end = None
+            self.description = None
+            self.error = None
+
             if spec is None:
                 self.set_this_month()
                 return

mia_core/utils.py

@@ -36,11 +36,11 @@ def new_pk(cls):
          int: The new random ID.
     """
     while True:
-        id = random.randint(100000000, 999999999)
+        pk = random.randint(100000000, 999999999)
         try:
-            cls.objects.get(pk=id)
+            cls.objects.get(pk=pk)
         except cls.DoesNotExist:
-            return id
+            return pk
 
 
 def strip_form(form):
@@ -65,11 +65,6 @@ class Language:
         locale (str); The locale name of this language.
         is_default (bool): Whether this is the default language.
     """
-    id = None
-    db = None
-    locale = None
-    is_default = False
-
     def __init__(self, language):
         self.id = language
         self.db = "_" + language.lower().replace("-", "_")
@@ -153,9 +148,6 @@ class UrlBuilder:
         base_path (str): the base path
         params (list[Param]): The query parameters
     """
-    base_path = None
-    params = []
-
     def __init__(self, start_url):
         """Constructs a new URL builder.
 
@@ -165,6 +157,7 @@ class UrlBuilder:
         pos = start_url.find("?")
         if pos == -1:
             self.base_path = start_url
+            self.params = []
             return
         self.base_path = start_url[:pos]
         self.params = []
@@ -240,9 +233,6 @@ class UrlBuilder:
             name (str): The parameter name
             value (str): The parameter value
         """
-        name = None
-        value = None
-
         def __init__(self, name, value):
             """Constructs a new query parameter
 
@@ -270,58 +260,47 @@ class Pagination:
     """The pagination.
 
     Args:
-        request (HttpRequest): The request
+        request (HttpRequest): The request.
-        items (list): All the items
+        items (list): All the items.
-        page_no (int): The specified page number
+        is_reversed (bool): Whether we should display the last page first.
-        page_size (int): The specified number of items per page
-        is_reversed (bool): Whether we should display the last
-                            page first
 
     Raises:
         PaginationException: With invalid pagination parameters
 
     Attributes:
-        is_reversed (bool): Whether we should display the last
+        current_url (str): The current request URL.
-                            page first
+        is_reversed (bool): Whether we should display the last page first.
         page_size (int): The page size.
         total_pages (int): The total number of pages available.
         is_paged (bool): Whether there are more than one page.
         page_no (int): The current page number.
         items (list[Model]): The items in the current page.
-        links (list[Link]): The navigation links in the pagination
-                            bar.
-        page_size_options(list[PageSizeOptions]): The page size
-                                                  options
     """
-    _current_url = None
-    is_reversed = False
-    page_size = None
-    total_pages = None
-    is_paged = None
-    page_no = None
-    items = None
-
     DEFAULT_PAGE_SIZE = 10
 
     def __init__(self, request, items, is_reversed=False):
-        current_url = request.get_full_path()
+        self.current_url = request.get_full_path()
-        self._current_url = current_url
         self.is_reversed = is_reversed
+        self.page_size = self.DEFAULT_PAGE_SIZE
+        self.total_pages = None
+        self.is_paged = None
+        self.page_no = 1
+        self.items = []
 
         # The page size
         try:
             self.page_size = int(request.GET["page-size"])
             if self.page_size == self.DEFAULT_PAGE_SIZE:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page-size")))
+                    UrlBuilder(self.current_url).remove("page-size")))
             if self.page_size < 1:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page-size")))
+                    UrlBuilder(self.current_url).remove("page-size")))
         except KeyError:
             self.page_size = self.DEFAULT_PAGE_SIZE
         except ValueError:
             raise PaginationException(str(
-                UrlBuilder(current_url).remove("page-size")))
+                UrlBuilder(self.current_url).remove("page-size")))
         self.total_pages = int(
             (len(items) - 1) / self.page_size) + 1
         default_page_no = 1 if not is_reversed else self.total_pages
@@ -332,21 +311,21 @@ class Pagination:
             self.page_no = int(request.GET["page"])
             if not self.is_paged:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page")))
+                    UrlBuilder(self.current_url).remove("page")))
             if self.page_no == default_page_no:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page")))
+                    UrlBuilder(self.current_url).remove("page")))
             if self.page_no < 1:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page")))
+                    UrlBuilder(self.current_url).remove("page")))
             if self.page_no > self.total_pages:
                 raise PaginationException(str(
-                    UrlBuilder(current_url).remove("page")))
+                    UrlBuilder(self.current_url).remove("page")))
         except KeyError:
             self.page_no = default_page_no
         except ValueError:
             raise PaginationException(str(
-                UrlBuilder(current_url).remove("page")))
+                UrlBuilder(self.current_url).remove("page")))
 
         if not self.is_paged:
             self.page_no = 1
@@ -355,14 +334,14 @@ class Pagination:
         start_no = self.page_size * (self.page_no - 1)
         self.items = items[start_no:start_no + self.page_size]
 
-    _links = None
-
-    @property
     def links(self):
-        """Returns the navigation links of the pagination bar."""
+        """Returns the navigation links of the pagination bar.
-        if self._links is None:
+
-            base_url = UrlBuilder(self._current_url).remove("page")
+        Returns:
-            self._links = []
+            list[Link]: The navigation links of the pagination bar.
+        """
+        base_url = UrlBuilder(self.current_url).remove("page")
+        links = []
         # The previous page
         link = self.Link()
         link.title = pgettext("Pagination|", "Previous")
@@ -377,7 +356,7 @@ class Pagination:
                 link.url = str(base_url.clone().add(
                     "page", str(self.page_no - 1)))
         link.is_small_screen = True
-            self._links.append(link)
+        links.append(link)
         # The first page
         link = self.Link()
         link.title = "1"
@@ -388,7 +367,7 @@ class Pagination:
                 "page", "1"))
         if self.page_no == 1:
             link.is_active = True
-            self._links.append(link)
+        links.append(link)
         # The previous ellipsis
         if self.page_no > 4:
             link = self.Link()
@@ -398,7 +377,7 @@ class Pagination:
                 link.title = "2"
                 link.url = str(base_url.clone().add(
                     "page", "2"))
-                self._links.append(link)
+            links.append(link)
         # The nearby pages
         for no in range(self.page_no - 2, self.page_no + 3):
             if no <= 1 or no >= self.total_pages:
@@ -409,7 +388,7 @@ class Pagination:
                 "page", str(no)))
             if no == self.page_no:
                 link.is_active = True
-                self._links.append(link)
+            links.append(link)
         # The next ellipsis
         if self.page_no + 3 < self.total_pages:
             link = self.Link()
@@ -419,7 +398,7 @@ class Pagination:
                 link.title = str(self.total_pages - 1)
                 link.url = str(base_url.clone().add(
                     "page", str(self.total_pages - 1)))
-                self._links.append(link)
+            links.append(link)
         # The last page
         link = self.Link()
         link.title = str(self.total_pages)
@@ -430,7 +409,7 @@ class Pagination:
                 "page", str(self.total_pages)))
         if self.page_no == self.total_pages:
             link.is_active = True
-            self._links.append(link)
+        links.append(link)
         # The next page
         link = self.Link()
         link.title = pgettext("Pagination|", "Next")
@@ -445,8 +424,8 @@ class Pagination:
                 link.url = str(base_url.clone().add(
                     "page", str(self.page_no + 1)))
         link.is_small_screen = True
-            self._links.append(link)
+        links.append(link)
-        return self._links
+        return links
 
     class Link:
         """A navigation link in the pagination bar.
@@ -458,14 +437,19 @@ class Pagination:
             is_small_screen (bool): Whether this link is for small
                                     screens
         """
-        url = None
+        def __int__(self):
-        title = None
+            self.url = None
-        is_active = False
+            self.title = None
-        is_small_screen = False
+            self.is_active = False
+            self.is_small_screen = False
 
-    @property
     def page_size_options(self):
-        base_url = UrlBuilder(self._current_url).remove(
+        """Returns the page size options.
+
+        Returns:
+            list[PageSizeOption]: The page size options.
+        """
+        base_url = UrlBuilder(self.current_url).remove(
             "page").remove("page-size")
         return [self.PageSizeOption(x, self._page_size_url(base_url, x))
                 for x in [10, 100, 200]]
@@ -496,9 +480,6 @@ class Pagination:
             size (int): The page size.
             url (str): The URL for this page size.
         """
-        size = None
-        url = None
-
         def __init__(self, size, url):
             self.size = size
             self.url = url
@@ -513,7 +494,5 @@ class PaginationException(Exception):
     Attributes:
         url (str): The canonical URL to redirect to.
     """
-    url = None
-
     def __init__(self, url):
         self.url = url