implement-scraper-feature

name	implement-scraper-feature
description	Use when working with a complete guide to adding a new data field to the CSFD scraper (e.g., extracting "budget" or "studio" from a movie page).
metadata	{"author":"bartholomej"}

Implement Scraper Feature

This skill guides you through the process of extracting a new piece of data from CSFD.cz.

1. Analyze the DOM

First, you need to find where the data is located in the HTML.

• Action: Use curl or open the page in a browser to inspect the element.
• Goal: Identify a unique CSS selector (class, ID, or structure).

2. Update the DTO (Data Transfer Object)

Define the shape of the new data.

• File: src/dto/[entity].ts (e.g., src/dto/movie.ts)
• Action: Add the new field to the interface.

  export interface CSFDMovie {
    // ... existing fields
    newField: string | null;
  }
  

3. Create a Helper Function

CRITICAL: Never write parsing logic inside the Service. Always use a helper.

• File: src/helpers/[entity].helper.ts

• Action: Create a pure function exported from the helper file.

  import { HTMLElement } from 'node-html-parser';
  
  export const getNewField = (el: HTMLElement): string | null => {
    const node = el.querySelector('.some-class');
    return node ? node.innerText.trim() : null;
  };
  

4. Integrate into Service

• File: src/services/[entity].service.ts
• Action: Call the helper function inside the build[Entity] method.

  // inside buildMovie method
  return {
    // ...
    newField: getNewField(el)
  };
  

5. Verification

• Action: Run the demo script to see if the data appears.
• Command: npm run demo (you might need to modify demo.ts to log the new field).

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