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The rules for the Formal Sector can be complex and evolving. Therefore, the "Formal Sector" solution should bring flexibility, to avoid complete redesign and databases change when a parameter to define the contribution value is changed.
To bring that flexibility, the solution described in that document use a "calculation module"here uses a Calculation Module. This module will create is defining a framework to design calculations and to manage their activation and version on in openIMIS. The calculation rule themselves will be in the form of other modules, dependent on the " Calculation " moduleModule. This solution will deliver a calculation module Calculation Module that takes the income (on the level of the contribution collection details) and a rate (on the level of the contribution plan) as parameters.
The value of the parameters will be saved as a JSON string in the json_ext field.
Later, this module could be used as a framework to create event-based actions
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Use cases
Back-end
UC14-1: add a new calculation (needs to change the openimis.json).
UC14-2: use the front end contribution to select a calculation.
UC14-3: use the fron end contribution to display the parameters required by multiple calculation for on object.
UC14-4: replace a calculation,
UC14-5: remove a calculation,
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UUID (char(24) )
CalculationRulesUUID (varchar)
Status (int)
ClassName
Main (bool)
Params (Json)
ClassParams(json)
Type
rights
Relevance
conditions
Json_ext (json)
DateCreated(date)
DateUpdate(date)
UserUpdateUUID(fk users)
UserCreateUUID (fk users)
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Detailed design
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Calculations Backend Module
Backend management code
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The back end management code will be used to register the calculation sub-module parameters, the sub-module status and the ReadUpdate right management on the database.
This code should have a function to clean the table from the remove calculation
This code should manage the uniqueness of the active version for a given UUID
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Return the data contained on the JSON so the frontend can ask the parameters for a new object of the ClassName.
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Events
contributionPlanUpdated -
Calculations Frontend Module
Calculation management page
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