Ruby on Rails complex association with mapping table -

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i have following models:

mapping, plan (plan_id), upgradegroup (pug_id), upgrade (pu_id), optiongroup (pog_id), , option (po_id).

their relationship plan has many upgradegroup, upgrade, optiongroup, , option. upgradegroup belongs plan , has many upgrade, optiongroup, , option. upgrade belongs upgradegroup , has many optiongroup , option. optiongroup belongs upgrade , has many option. , lastly, option belongs optiongroup.

i'm working multiple databases cannot change in way, , set of associations 1 i'm having trouble with. mapping table contains following details regarding how objects matched up.

mapping database table

i have each of models set using proper table name , primary key, need set association can plan.upgrade_groups , 4 results (objects pug_ids: 12, 27, 28, 30), or plan.upgrade_group.first.upgrades , 1 result (pu_id: 44) , such. right i'm far plan.mappings #=> 16 results, mapping model is:

has_many :plans,   foreign_key: "plan_id"  has_many :upgrade_groups,   foreign_key: "pug_id"  has_many :upgrades,   foreign_key: "pu_id"  has_many :option_groups,   foreign_key: "pog_id"  has_many :options,   foreign_key: "po_id"


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