MongoDB Tree Structure Multiple Parents, sum and multiply -


i trying build bill of materials mini-app.

the heirarchy image below shows how there number of assemblies (the 110 numbers) 1 or more parts (100 numbers) or assemblies nested below them.

bill of materials heirarchy

currently data structured this:

collection.insert({'part_project': 998,                    'part_number': 002,                    'part_category_prefix': 1,                    'part_type': 110,                    'part_description': 'tier 2 assembly b',                    'part_revision': 1,                    'part_version': 'a',                    'bill_of_material_usages': [{                        'bom_version': 'a',                        'part_version': 'a',                        'part_revision': 1,                        'children': [                            {'part_number': '998 1 3 100', 'quantity': 3},                            {'part_number': '998 1 4 110', 'quantity': 1}                        ]}]                    })

there array called 'bill_of_material_usages' stores information part or assembly's children , versions referenced.

i'm trying figure out how represent in table each assembly lists of parts , sub-assemblies.

i'm trying figure out how add total quantities of part. means if assembly has 2 of assembly b , assembly b has 3 of part there total of 2*3=6 part a's.

any advice on how current data structure or better structure fantastic.

i'm using mongodb, flask, vis.js , google charts.

thanks!!

i solved using recursive function follows children branch of tree until last child has no further children. allows me build structured tree , calculate total number of instances of individual part.

recursive functions limited number of recursions possible (think inception) although limitation unlikely have impact use-case.


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