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@@ -1,2 +1,45 @@
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# query-node
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+The query-node project contains an input schema (schema.graphql) and mappings for the Joystream `content-directory` runtime module.
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+
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+## Code generation
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+
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+We use Hydra-cli to generate a graphql server and a block indexer for joystream chain:
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+
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+```bash
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+$ cd query-node
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+$ hydra-cli codegen
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+```
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+
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+After codegen process is done, we must add this lines to the `indexer/tsconfig.json` file. It is required because we are using `joystream/types` for decoding chain data in the mappings:
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+
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+```json
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+{
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+ "compilerOptions":
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+ ...
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+ "baseUrl": ".",
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+ "paths": {
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+ "@polkadot/types/augment": ["../../node_modules/@joystream/types/augment-codec/augment-types.ts"]
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+ }
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+}
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+```
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+
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+## Run mapping processor
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+
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+Before running mappings make sure indexer(`yarn indexer:start`) and indexer-api-server (mappings get the chain data from this graphql server) are both running:
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+
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+```bash
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+yarn processor:start
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+```
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+
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+## Query data
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+
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+Once processor start to store event data you will be able to query this data from `http://localhost:4002/graphql`.
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+
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+```graphql
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+query {
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+ channels {
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+ title
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+ }
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+}
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+```
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metmirr