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Multiple Sheets

Often you’ll want to import data that actually implicitly has multiple data schemas within it. For example, consider importing a CSV of employees working across multiple companies. title In the above example, the company fields are actually duplicated for both Emily and Chris. In this case, you’d most likely have a database table called employees and another one called companies, so this import should create 3 users but only 2 companies. HelloCSV allows you to split the employee data and company data into separate sheets on the frontend, before the upload, to give the user a chance to review the upload and make edits. Here is an example HelloCSV definition for the data above: 
<Importer
  sheets={[
    {
      id: 'employees',
      label: 'Employees',
      columns: [
        { label: 'Employee ID', id: 'id', type: 'number' },
        { label: 'Employee Name', id: 'name', type: 'string', },
        {
          label: 'Company',
          id: 'company',
          type: 'reference',
          typeArguments: {
            sheetId: 'companies',
            sheetColumnId: 'name',
          },
          validators: [{ validate: 'required' }],
        },
      ],
    },
    {
      id: 'companies',
      label: 'Companies',
      columns: [
        { label: 'Company Name', id: 'name', type: 'string', validators: [{ validate: 'required' }], },
        { label: 'Company Industry', id: 'industry', type: 'string', },
      ],
    },
  ]}
  onDataColumnsMapped={(sheets: any) => {
    // Filter companies down to only unique names
    const sheet = sheets.find((sheet: any) => sheet.sheetId === 'companies')!;
    const seen = new Set();
    sheet.rows = [...sheet.rows].filter((row: SheetRow) => {
      // Remove duplicate companies
      const hasSeen = !seen.has(row.name);
      seen.add(row.name);
      return hasSeen;
    });
    return sheets;
  }}
  onComplete={async (data) => {
    const employees = data.sheetData.find((s: any) => s.id === 'employees');
    const companies = data.sheetData.find((s: any) => s.id === 'companies');
    console.log(employees);
    // [{id: 1, name: "Mat", company: "Dunder Mifflin"}, {id: 2, name: "Emily", company: "Los Pollos Hermanos"}, {id: 3, name: "Chris", company: "Los Pollos Hermanos"}]
    console.log(companies);
    // [{name: "Dunder Mifflin", industry: "Paper"}, {name: "Los Pollos Hermanos", industry: "Food & Beverage"}]
  }}
/>

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Screenshots

Preview Mapping Employees Sheet Companies Sheet
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