226 lines
8.1 KiB
Python
226 lines
8.1 KiB
Python
# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
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# License: GNU General Public License v3. See license.txt
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from __future__ import unicode_literals
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import frappe
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from frappe import _
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from frappe.utils import cstr, flt
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import json
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class ItemVariantExistsError(frappe.ValidationError): pass
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class InvalidItemAttributeValueError(frappe.ValidationError): pass
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class ItemTemplateCannotHaveStock(frappe.ValidationError): pass
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@frappe.whitelist()
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def get_variant(template, args=None, variant=None, manufacturer=None,
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manufacturer_part_no=None):
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"""Validates Attributes and their Values, then looks for an exactly
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matching Item Variant
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:param item: Template Item
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:param args: A dictionary with "Attribute" as key and "Attribute Value" as value
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"""
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item_template = frappe.get_doc('Item', template)
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if item_template.variant_based_on=='Manufacturer' and manufacturer:
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return make_variant_based_on_manufacturer(item_template, manufacturer,
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manufacturer_part_no)
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else:
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if isinstance(args, basestring):
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args = json.loads(args)
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if not args:
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frappe.throw(_("Please specify at least one attribute in the Attributes table"))
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return find_variant(template, args, variant)
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def make_variant_based_on_manufacturer(template, manufacturer, manufacturer_part_no):
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'''Make and return a new variant based on manufacturer and
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manufacturer part no'''
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from frappe.model.naming import append_number_if_name_exists
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variant = frappe.new_doc('Item')
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copy_attributes_to_variant(template, variant)
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variant.manufacturer = manufacturer
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variant.manufacturer_part_no = manufacturer_part_no
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variant.item_code = append_number_if_name_exists('Item', template.name)
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return variant
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def validate_item_variant_attributes(item, args=None):
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if isinstance(item, basestring):
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item = frappe.get_doc('Item', item)
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if not args:
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args = {d.attribute.lower():d.attribute_value for d in item.attributes}
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attribute_values, numeric_values = get_attribute_values()
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for attribute, value in args.items():
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if not value:
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continue
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if attribute.lower() in numeric_values:
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numeric_attribute = numeric_values[attribute.lower()]
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validate_is_incremental(numeric_attribute, attribute, value, item.name)
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else:
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attributes_list = attribute_values.get(attribute.lower(), [])
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validate_item_attribute_value(attributes_list, attribute, value, item.name)
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def validate_is_incremental(numeric_attribute, attribute, value, item):
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from_range = numeric_attribute.from_range
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to_range = numeric_attribute.to_range
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increment = numeric_attribute.increment
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if increment == 0:
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# defensive validation to prevent ZeroDivisionError
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frappe.throw(_("Increment for Attribute {0} cannot be 0").format(attribute))
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is_in_range = from_range <= flt(value) <= to_range
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precision = max(len(cstr(v).split(".")[-1].rstrip("0")) for v in (value, increment))
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#avoid precision error by rounding the remainder
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remainder = flt((flt(value) - from_range) % increment, precision)
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is_incremental = remainder==0 or remainder==increment
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if not (is_in_range and is_incremental):
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frappe.throw(_("Value for Attribute {0} must be within the range of {1} to {2} in the increments of {3} for Item {4}")\
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.format(attribute, from_range, to_range, increment, item),
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InvalidItemAttributeValueError, title=_('Invalid Attribute'))
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def validate_item_attribute_value(attributes_list, attribute, attribute_value, item):
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if attribute_value not in attributes_list:
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frappe.throw(_("Value {0} for Attribute {1} does not exist in the list of valid Item Attribute Values for Item {2}").format(
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attribute_value, attribute, item), InvalidItemAttributeValueError, title=_('Invalid Attribute'))
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def get_attribute_values():
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if not frappe.flags.attribute_values:
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attribute_values = {}
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numeric_values = {}
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for t in frappe.get_all("Item Attribute Value", fields=["parent", "attribute_value"]):
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attribute_values.setdefault(t.parent.lower(), []).append(t.attribute_value)
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for t in frappe.get_all('Item Attribute',
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fields=["name", "from_range", "to_range", "increment"], filters={'numeric_values': 1}):
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numeric_values[t.name.lower()] = t
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frappe.flags.attribute_values = attribute_values
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frappe.flags.numeric_values = numeric_values
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return frappe.flags.attribute_values, frappe.flags.numeric_values
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def find_variant(template, args, variant_item_code=None):
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conditions = ["""(iv_attribute.attribute="{0}" and iv_attribute.attribute_value="{1}")"""\
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.format(frappe.db.escape(key), frappe.db.escape(cstr(value))) for key, value in args.items()]
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conditions = " or ".join(conditions)
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# use approximate match and shortlist possible variant matches
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# it is approximate because we are matching using OR condition
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# and it need not be exact match at this stage
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# this uses a simpler query instead of using multiple exists conditions
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possible_variants = frappe.db.sql_list("""select name from `tabItem` item
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where variant_of=%s and exists (
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select name from `tabItem Variant Attribute` iv_attribute
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where iv_attribute.parent=item.name
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and ({conditions}) and parent != %s
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)""".format(conditions=conditions), (template, cstr(variant_item_code)))
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for variant in possible_variants:
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variant = frappe.get_doc("Item", variant)
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if len(args.keys()) == len(variant.get("attributes")):
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# has the same number of attributes and values
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# assuming no duplication as per the validation in Item
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match_count = 0
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for attribute, value in args.items():
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for row in variant.attributes:
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if row.attribute==attribute and row.attribute_value== cstr(value):
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# this row matches
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match_count += 1
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break
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if match_count == len(args.keys()):
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return variant.name
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@frappe.whitelist()
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def create_variant(item, args):
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if isinstance(args, basestring):
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args = json.loads(args)
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template = frappe.get_doc("Item", item)
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variant = frappe.new_doc("Item")
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variant.variant_based_on = 'Item Attribute'
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variant_attributes = []
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for d in template.attributes:
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variant_attributes.append({
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"attribute": d.attribute,
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"attribute_value": args.get(d.attribute)
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})
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variant.set("attributes", variant_attributes)
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copy_attributes_to_variant(template, variant)
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make_variant_item_code(template.item_code, variant)
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return variant
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def copy_attributes_to_variant(item, variant):
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from frappe.model import no_value_fields
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# copy non no-copy fields
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exclude_fields = ["item_code", "item_name", "show_in_website"]
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if item.variant_based_on=='Manufacturer':
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# don't copy manufacturer values if based on part no
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exclude_fields += ['manufacturer', 'manufacturer_part_no']
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for field in item.meta.fields:
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if field.fieldtype not in no_value_fields and (not field.no_copy)\
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and field.fieldname not in exclude_fields:
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if variant.get(field.fieldname) != item.get(field.fieldname):
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variant.set(field.fieldname, item.get(field.fieldname))
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variant.variant_of = item.name
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variant.has_variants = 0
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if item.variant_based_on=='Item Attribute':
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if variant.attributes:
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variant.description += "\n"
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for d in variant.attributes:
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variant.description += "<p>" + d.attribute + ": " + cstr(d.attribute_value) + "</p>"
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def make_variant_item_code(template_item_code, variant):
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"""Uses template's item code and abbreviations to make variant's item code"""
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if variant.item_code:
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return
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abbreviations = []
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for attr in variant.attributes:
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item_attribute = frappe.db.sql("""select i.numeric_values, v.abbr
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from `tabItem Attribute` i left join `tabItem Attribute Value` v
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on (i.name=v.parent)
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where i.name=%(attribute)s and (v.attribute_value=%(attribute_value)s or i.numeric_values = 1)""", {
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"attribute": attr.attribute,
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"attribute_value": attr.attribute_value
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}, as_dict=True)
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if not item_attribute:
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return
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# frappe.throw(_('Invalid attribute {0} {1}').format(frappe.bold(attr.attribute),
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# frappe.bold(attr.attribute_value)), title=_('Invalid Attribute'),
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# exc=InvalidItemAttributeValueError)
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abbr_or_value = cstr(attr.attribute_value) if item_attribute[0].numeric_values else item_attribute[0].abbr
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abbreviations.append(abbr_or_value)
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if abbreviations:
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variant.item_code = "{0}-{1}".format(template_item_code, "-".join(abbreviations))
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if variant.item_code:
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variant.item_name = variant.item_code
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