From 6d29bc27e78bc549479cbbc203c683137ace9d48 Mon Sep 17 00:00:00 2001
From: luixal <luixal@gmail.com>
Date: Mon, 4 Jan 2021 09:43:58 +0100
Subject: Adds mapping remote field to Homer expected ones when loading message
 from url

---
 docs/tips-and-tricks.md | 58 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'docs/tips-and-tricks.md')

diff --git a/docs/tips-and-tricks.md b/docs/tips-and-tricks.md
index 2719fc5..63eeeaf 100644
--- a/docs/tips-and-tricks.md
+++ b/docs/tips-and-tricks.md
@@ -113,6 +113,64 @@ docker create \
 
 
 ## Get the news headlines in Homer
+
+### Mapping Fields
+Most times, the url you're getting headlines from follows a different schema than the one expected by Homer.
+
+For example, if you would like to show jokes from ChuckNorris.io, you'll find that the url https://api.chucknorris.io/jokes/random is giving you info like this:
+
+```json
+{
+  "categories": [],
+  "created_at": "2020-01-05 13:42:22.089095",
+  "icon_url": "https://assets.chucknorris.host/img/avatar/chuck-norris.png",
+  "id": "MR2-BnMBR667xSpQBIleUg",
+  "updated_at": "2020-01-05 13:42:22.089095",
+  "url": "https://api.chucknorris.io/jokes/MR2-BnMBR667xSpQBIleUg",
+  "value": "Chuck Norris can quitely sneak up on himself"
+}
+```
+
+but... you need that info to be transformed to something like this:
+
+```json
+{
+  "title": "MR2-BnMBR667xSpQBIleUg",
+  "content": "Chuck Norris can quitely sneak up on himself"
+}
+```
+
+Now, you can do that using the `mapping` field in your `message` configuration. This example would be something like this:
+
+```yml
+message:
+  url: https://api.chucknorris.io/jokes/random
+    mapping:
+      title: 'id'
+      content: 'value'
+```
+
+As you would see, using the ID as a title doesn't seem nice, that's why when a field is empty it would keep the default values, like this:
+
+```yml
+message:
+  url: https://api.chucknorris.io/jokes/random
+    mapping:
+      content: 'value'
+  title: "Chuck Norris Facts!"
+```
+
+and even an error message in case the `url` didn't respond or threw an error:
+
+```yml
+message:
+  url: https://api.chucknorris.io/jokes/random
+    mapping:
+      content: 'value'
+  title: "Chuck Norris Facts!"
+  content: "Message could not be loaded"
+```
+
 #### `by @JamiePhonic`
 
 Homer allows you to set a "message" that will appear at the top of the page, however, you can also supply a `url:`.
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