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Custom Subgraph queries
The data that the Subgraphs contain can be used to answer complex questions. While the available connectors create a simplified abstraction by implementing queries that cover the most generic use cases, you can go further by invoking your own queries.
Subgraph schemas
To be able to fetch data from the Subgraph, we first have to understand their GraphQL schemas. You can find the schemas associated with each Subgraph included officially with Aragon Connect in the Connectors Reference section.
Creating a custom query
You can use any tool that supports GraphQL, but for simplicity in illustration, we have chosen
graphql-tag in the following examples:1
import gql from 'graphql-tag'
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import { GraphQLWrapper } from '@aragon/connect-thegraph'
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​
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// Construct the query
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const QUERY = gql`
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query {
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votes(where:{
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appAddress: "${VOTING_APP_ADDRESS}"
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}) {
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id
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metadata
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creator
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}
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}
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`
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​
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// Create the GraphQL wrapper using the specific Subgraph URL
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const wrapper = new GraphQLWrapper(VOTING_SUBGRAPH_URL)
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​
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// Invoke the custom query and receive data
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const results = await wrapper.performQuery(QUERY)
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​
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const { votes } = results.data
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gql is exposed from graphql-tag and is a utility that parses strings into structured GraphQL query objects.Subscriptions
It is also possible to create a subscription to a custom query:
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import gql from 'graphql-tag'
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import { GraphQLWrapper } from '@aragon/connect-thegraph'
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​
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// Construct the query
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const QUERY = gql`
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query miniMeToken($id: String!, $address: String!) {
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miniMeToken(id: $id) {
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id
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totalSupply
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holders(where: { address: $address }) {
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address
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balance
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}
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}
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}
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`
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​
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// Create the GraphQL wrapper using the specific Subgraph URL
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const wrapper = new GraphQLWrapper(TOKEN_MANAGER_SUBGRAPH)
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​
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// Create the subscription and receive updates every time the data changes
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const subscription = wrapper.subscribeToQuery(
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QUERY,
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{
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id: TOKEN_ID,
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address: ACCOUNT_ADDRES,
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},
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(error, results) => {
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if (error) throw error
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​
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// Handle each new result
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const { miniMeToken } = results.data
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}
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)
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​
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// Stop receiving updates
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subscription.unsubscribe()
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