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Viewing file:     builder-interface-augmenter.js (3.65 KB)      -rw-r--r--

const clone = require('lodash/clone');
const isEmpty = require('lodash/isEmpty');
const { callbackify } = require('util');
const finallyMixin = require('./util/finally-mixin');
const { formatQuery } = require('./execution/internal/query-executioner');

function augmentWithBuilderInterface(Target) {
  Target.prototype.toQuery = function (tz) {
    let data = this.toSQL(this._method, tz);
    if (!Array.isArray(data)) data = [data];
    if (!data.length) {
      return '';
    }

    return data
      .map((statement) => {
        return formatQuery(statement.sql, statement.bindings, tz, this.client);
      })
      .reduce((a, c) => a.concat(a.endsWith(';') ? '\n' : ';\n', c));
  };

  // Create a new instance of the `Runner`, passing in the current object.
  Target.prototype.then = function (/* onFulfilled, onRejected */) {
    let result = this.client.runner(this).run();

    if (this.client.config.asyncStackTraces) {
      result = result.catch((err) => {
        err.originalStack = err.stack;
        const firstLine = err.stack.split('\n')[0];

        // a hack to get a callstack into the client code despite this
        // node.js bug https://github.com/nodejs/node/issues/11865
        // see lib/util/save-async-stack.js for more details
        const { error, lines } = this._asyncStack;
        const stackByLines = error.stack.split('\n');
        const asyncStack = stackByLines.slice(lines);
        asyncStack.unshift(firstLine);

        // put the fake more helpful "async" stack on the thrown error
        err.stack = asyncStack.join('\n');
        throw err;
      });
    }

    return result.then.apply(result, arguments);
  };

  // Add additional "options" to the builder. Typically used for client specific
  // items, like the `mysql` and `sqlite3` drivers.
  Target.prototype.options = function (opts) {
    this._options = this._options || [];
    this._options.push(clone(opts) || {});
    return this;
  };

  // Sets an explicit "connection" we wish to use for this query.
  Target.prototype.connection = function (connection) {
    this._connection = connection;
    this.client.processPassedConnection(connection);
    return this;
  };

  // Set a debug flag for the current schema query stack.
  Target.prototype.debug = function (enabled) {
    this._debug = arguments.length ? enabled : true;
    return this;
  };

  // Set the transaction object for this query.
  Target.prototype.transacting = function (transaction) {
    if (transaction && transaction.client) {
      if (!transaction.client.transacting) {
        transaction.client.logger.warn(
          `Invalid transaction value: ${transaction.client}`
        );
      } else {
        this.client = transaction.client;
      }
    }
    if (isEmpty(transaction)) {
      this.client.logger.error(
        'Invalid value on transacting call, potential bug'
      );
      throw Error(
        'Invalid transacting value (null, undefined or empty object)'
      );
    }
    return this;
  };

  // Initializes a stream.
  Target.prototype.stream = function (options) {
    return this.client.runner(this).stream(options);
  };

  // Initialize a stream & pipe automatically.
  Target.prototype.pipe = function (writable, options) {
    return this.client.runner(this).pipe(writable, options);
  };

  Target.prototype.asCallback = function (cb) {
    const promise = this.then();
    callbackify(() => promise)(cb);
    return promise;
  };

  Target.prototype.catch = function (onReject) {
    return this.then().catch(onReject);
  };

  Object.defineProperty(Target.prototype, Symbol.toStringTag, {
    get: () => 'object',
  });

  finallyMixin(Target.prototype);
}

module.exports = {
  augmentWithBuilderInterface,
};