Multi-chain Indexing with Subquery | Substrate Seminar (full livestream)

In this seminar, James steps us through how Subquery provides blockchain data indexing solutions for projects and developers building on Polkadot. In particular, he demos a feature that allows indexing and querying data from multiple parachains into a single SubQuery dataset. See the seminar lesson plan for more details and links to learning resources:
https://github.com/substrate-develope...

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#polkadot #subquery #graphql #indexing

0:00 Intro
3:28 What problems does Subquery solve?
6:40 Who are you target customers? (green)
10:19 What is Subquery?
11:05 Building on Subsrate - dApp stack
17:00 SubQuery’s design
29:29 Q: How does querying a Substrate node compare to other blockchains?
31:50 Writing a mapping handler for tracking Events
35:32 Run the schema, project manifest and mapping files
37:03 Query examples from demo
40:58 Multi-chain indexing demo
49:20 Writing the mapping handlers for Polkadot and Kusama
55:04 Query examples from demo
57:32 More complex query examples
1:05:02 How to run this in a production environment
1:06:35 Decentralizing and extending SubQuery’s tech stack
1:15:29 Large scale project example using SubQuery
1:18:49 Additional SubQuery features
1:25:20 Tips for builders getting building on Polkadot

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