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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Diggernaut: Documentation for Meta-Language | Runtime Entities | Objects</title>
<meta name="description" content="Objects for storing collected data, how are they implemented.">
<meta name="keywords" content="Diggernaut, scraping, web scraping, scraper, web scraper, meta-language, make scraper, scraper for websites, learning to scrape, data acquisition, create scraper, online scraper, content scraper, scraper for shop, scraper for classifieds, coding scraper, objects">
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<div class="lessons-container" id="main">
<div class="container">
<h1>Runtime Entities</h1>
<div>
<h2>Objects</h2>
<p class="flow-text">
Objects are containers for storing collected data. <br/>
Diggernaut supports not only flat data structures,
but also nested, so objects can be nested in other objects.
</p>
<p class="flow-text">
The main points that you should know about objects:
</p>
<blockquote class="custom darken-1">
<ol class="flow-text">
<li>Objects serve to save the collected data</li>
<li>Objects exist in all contexts and are context-independent</li>
<li>Before writing fields to an object, you need to create this object</li>
<li>The entry in the object fields is possible from any block within the scope where the object is created</li>
<li>For correct operation, the objects must be stored in the same block where they were opened</li>
<li>An object can be stored to the field of another object or to the database</li>
</ol>
</blockquote>
<p class="flow-text">
Example of using a simple object:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s4"><a class="active" href="#config">Digger script</a></li>
<li class="tab col s4"><a href="#html">Source HTML</a></li>
<li class="tab col s4"><a href="#log">Execution log</a></li>
<li class="tab col s4"><a href="#data">Data in JSON format</a></li>
</ul>
</div>
<div id="config" class="col s12">
<pre class="language-yaml">
<code class="language-yaml">---
config:
debug: 2
agent: Firefox
do:
- walk:
to: https://www.diggernaut.com/sandbox/meta-lang-object-en.html
do:
# let's create new object with name `item`
- object_new: item
- find:
path: h1
do:
- parse
# store register value to the `title` field of the object `item`
- object_field_set:
object: item
field: title
- find:
path: p
do:
- parse
# store register value to the `description` field of the object `item`
- object_field_set:
object: item
field: description
# save object to the database
- object_save:
name: item
</code></pre>
</div>
<div id="log" class="col s12">
<table class="striped responsive-table debug-log">
<thead>
<tr role="row">
<th tabindex="0" rowspan="1" colspan="1" width="11%">Time</th>
<th tabindex="0" rowspan="1" colspan="1" width="6%">Level</th>
<th tabindex="0" rowspan="1" colspan="1">Message</th>
</tr>
</thead>
<tbody>
<tr role="row" class="odd">
<td>2017-10-21 03:20:43:412</td>
<td>info</td>
<td class=" word-wrapper">Scrape is done</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:687</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Saving object with name: item</span></td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:679</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Saved field description for object item: Lorem ipsum dolor sit amet.</span></td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:671</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsed content: Lorem ipsum dolor sit amet.</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:663</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing block with arguments: map[]</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:654</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Block content: Lorem ipsum dolor sit amet.</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:647</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Number of found blocks: 1</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:639</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Looking for: p</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:631</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Saved field title for object item: Title-1</span></td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:621</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsed content: Title-1</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:614</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing block with arguments: map[]</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:606</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Block content: Title-1</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:598</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Number of found blocks: 1</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:590</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Looking for: h1</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:582</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Creating object with name: item</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:568</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <html lang="en"><br/>
<head><br/>
<meta charset="UTF-8"/><br/>
<title>Diggernaut | Meta-Language | Object sample</title><br/>
</head><br/>
<body><br/>
<h1>Title-1</h1><br/>
<p>Lorem ipsum dolor sit amet.</p><br/>
</body><br/>
</html>
</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:269</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:263</td>
<td>info</td>
<td class=" word-wrapper">Starting scrape</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:250</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up default proxy</td>
</tr>
<tr role="row" class="even">
<td>2017-10-21 03:20:42:235</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up surf</td>
</tr>
<tr role="row" class="odd">
<td>2017-10-21 03:20:42:208</td>
<td>info</td>
<td class=" word-wrapper">Starting digger: meta-lang-object [1853]</td>
</tr>
</tbody>
</table>
</div>
<div id="html" class="col s12">
<pre class="language-html">
<code class="language-html"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Diggernaut | Meta-Language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body>
</html>
</code></pre>
</div>
<div id="data" class="col s12">
<pre class="language-json">
<code class="language-json">{
item : {
title : "Title-1",
description : "Lorem ipsum dolor sit amet."
}
}
</code></pre>
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