# operation: accounting

###### Sprint: ?

### Outcome:
a simple information about operations.

#### File destination:

{$Dena_Path}/app/model/operations/

##### Doc

* Operation:

this is the base class for operations and subcategories Heir from it.
operation column:
1. reference: it has polymorphic for every type of references(for example trades or withdraws or deposit or ..)
2. currencies: code of currency 
3. credit: plus funds
4. debit: minus funds
5. account

methods of operations were implemented in this class and subcategories only use them.

```mermaid
graph TD
    A[operation] -->|inheritance| B(Expense)
    A[operation] -->|inheritance| C(Asset)
    A[operation] -->|inheritance| D(Liability)
    A[operation] -->|inheritance| E(Revenue)
```
this chart showed inheritance structure of operation.

1. Expense:<br >
   Expense is a income statement operation.
   
2. Asset<br >
   is a balance sheet operation.every income/outcome of system store and controll by it.
   
3. Liability<br >
   is a balance sheet operation and belongs to members and we manage members accounting things by it.
   for example trades and deposit.
   
4. Revenue:<br >
   is a income statement operation and we manage exchange revenue by it.
   
####SO:
* revenue --> revenue of exchange
* liability --> users accounting
* asset --> exchange assets
* expense --> ?