Implemented processor for Lenovo processing #107
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… and column names Two class attributes, `export_columns_list` and `exported_columns_map`, has been added to `Invoice`, along with a class function `_filter_columns()`. Subclasses of `Invoice` must now define `export_columns_list`, containing the ordered list of columns that must be exported in their respective invoices. Subclasses can optional define `exported_columns_map`, containing mappings between "internal" column names and what their name should be when exported. The field name `RATE_FIELD` has been added to `invoice.py`. It was previously forgotten.
A `Processor` class has been added, subclassing from the `Invoice` class. This is the first step to refactor invoicing in order to seperate the processing and filtering/exporting functionalities of our current Invoice subclasses. Subclasses of `Processor` should only process invoices and manipulate its internal data, while subclasses of `Invoice` should only perform filtering and exporting, never changing any data itself. In addition to implementing `Processor`, two of its subclasses, `ValidatePIAliasProcessor` and `AddInstitutionProcessor` has been added to perform some preliminary processing steps.
Note that, for now, only the Lenovo invoice will take the processed data from the `LenovoProcessor`. All other invoices will take the data from `AddInstituteProcessor`. This is due to the processors adding new columns. This odd code design will be removed once invoices gain the feature to filter out their exported columns.
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Closes #103. Dependant on #99 and #100. Note that, for now, only the Lenovo invoice will take the processed data from the
LenovoProcessor. All other invoices will take the data fromAddInstituteProcessor. This is due to the processors adding new columns. This odd code design will be removed once invoices gain the feature to filter out their exported columns.