cap-cds-mongoose/lib/deployer.js

MongoDB (Mongoose) persistence adapter & deployer for SAP CAP (works like @cap-js/hana / @cap-js/sqlite)

// lib/deployer.js
const fs = require("fs");
const path = require("path");
const csv = require("csv-parser");
const cds = require("@sap/cds");
const { connect } = require("./connection");
const { getModel, modelName } = require("./mapper");

/**
 * Entry for cd deploy --to mongoose
 * cds will call the function exported by the deployer plugin
 */
async function deploy(csn, options = {}) {
  // csn might be either raw or cds.model
  const model = csn.definitions ? csn : cds.model; // attempt
  await connect(process.env.MONGO_URL);

  const definitions = model.definitions || {};

  // iterate entities
  for (const name of Object.keys(definitions)) {
    const def = definitions[name];
    if (!def || def.kind !== "entity") continue;

    console.log(`[mongoose-cap-amo] Ensuring collection for ${name}`);
    const m = getModel(model, def); // will create mongoose model

    // Optionally clear/ensure indices -- keep minimal
    try {
      await m.createCollection();
    } catch (e) {
      // collection may already exist; ignore
    }

    // look for seed CSV in db/data/<namespace-entity>.csv or db/data/<entity>.csv
    const shortName = modelName(name);
    const csvCandidates = [
      path.join(process.cwd(), "db", "data", `${shortName}.csv`),
      path.join(process.cwd(), "db", "data", `${name.replace(/\./g, "-")}.csv`),
      path.join(process.cwd(), "db", "data", `${name.split(".").pop()}.csv`)
    ];

    for (const csvFile of csvCandidates) {
      if (fs.existsSync(csvFile)) {
        console.log(`[mongoose-cap-amo] Importing records from ${csvFile}`);
        const rows = [];
        await new Promise((resolve) => {
          fs.createReadStream(csvFile)
            .pipe(csv())
            .on("data", (data) => rows.push(data))
            .on("end", resolve);
        });
        if (rows.length) {
          // convert simple types? For now insert strings and let Mongoose cast
          // wipe existing
          await m.deleteMany({});
          await m.insertMany(rows);
          console.log(`[mongoose-cap-amo] Imported ${rows.length} rows into ${name}`);
        }
        break;
      }
    }
  }

  console.log("[mongoose-cap-amo] deploy complete");
}

module.exports = { deploy };