# query-node

The query-node project contains an input schema (schema.graphql) and mappings for the Joystream `content-directory` runtime module.

## Code generation

We use Hydra-cli to generate a graphql server and a block indexer for joystream chain:

```bash
$ cd query-node
$ hydra-cli codegen
```

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:

```json
{
  "compilerOptions":
    ...
    "baseUrl": ".",
    "paths": {
      "@polkadot/types/augment": ["../../node_modules/@joystream/types/augment-codec/augment-types.ts"]
    }
}
```

## Run mapping processor

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:

```bash
yarn processor:start
```

## Query data

Once processor start to store event data you will be able to query this data from `http://localhost:4002/graphql`.

```graphql
query {
  channels {
    title
  }
}
```