1. View, filter, and save Product Permutation. \n 2. Synchronised with Product Category page and all common functionality moved into base and base table css, js, and python files.

forms/store/product_permutation.py

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+"""
+Project:    PARTS Website
+Author:     Edward Middleton-Smith
+            Precision And Research Technology Systems Limited
+
+Technology: Backend
+Feature:    Forms - Product Category Filters data input
+
+Description:
+Defines Flask-WTF forms for handling product category filter input.
+"""
+
+# internal
+from business_objects.store.store_base import Store_Base
+# from business_objects.store.product_category import Filters_Product_Category
+# from models.model_view_store import Model_View_Store # circular
+# from helpers.DEPRECATED.helper_abc import Interface_ABC
+from forms.base import Form_Base
+import lib.argument_validation as av
+# external
+from flask_wtf import FlaskForm
+from wtforms import StringField, TextAreaField, SubmitField, BooleanField, IntegerField, SelectField, FloatField
+from wtforms.validators import InputRequired, NumberRange, Regexp, DataRequired, Optional
+from flask_wtf.recaptcha import RecaptchaField
+from abc import ABCMeta, abstractmethod
+
+
+class Filters_Product_Permutation(Form_Base):
+    id_category = SelectField('Category', validators=[Optional()], choices=[])
+    id_product = SelectField('Product', validators=[Optional()], choices=[])
+    is_out_of_stock = BooleanField('Out of stock only?')
+    quantity_min = FloatField('Min stock')
+    quantity_max = FloatField('Max stock')
+    # submit = SubmitField('Submit')
+    """
+    @classmethod
+    def from_filters(cls, filters):
+        form = Filters_Product_Permutation()
+        form.id_category.choices = Store_Base.convert_list_objects_to_list_options(filters.categories)
+        form.id_product.choices = Store_Base.convert_list_objects_to_list_options(filters.products)
+        form.is_out_of_stock.data = filters.is_out_of_stock
+        form.quantity_min.data = filters.quantity_min
+        form.quantity_max.data = filters.quantity_max
+        return form
+    """
+    def __repr__(self):
+        return f'''
+            Filters_Product_Permutation(
+                id_category={self.id_category.data}, 
+                id_product={self.id_product.data}, 
+                is_out_of_stock={self.is_out_of_stock.data}, 
+                quantity_min={self.quantity_min.data}, 
+                quantity_max={self.quantity_max.data})
+        '''
+    @classmethod
+    def from_json(cls, json):
+        form =  Filters_Product_Permutation()
+        form.id_category.choices = [(json[Store_Base.ATTR_ID_PRODUCT_CATEGORY], json[Store_Base.ATTR_ID_PRODUCT_CATEGORY])]
+        form.id_category.data = json[Store_Base.ATTR_ID_PRODUCT_CATEGORY]
+        form.id_product.choices = [(json[Store_Base.ATTR_ID_PRODUCT], json[Store_Base.ATTR_ID_PRODUCT])]
+        form.id_product.data = json[Store_Base.ATTR_ID_PRODUCT]
+        form.is_out_of_stock.data = av.input_bool(json[Store_Base.FLAG_IS_OUT_OF_STOCK], 'is_out_of_stock', 'Filters_Product_Permutation')
+        form.quantity_min.data = json[Store_Base.FLAG_QUANTITY_MIN]
+        form.quantity_max.data = json[Store_Base.FLAG_QUANTITY_MAX]
+        return form