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import { SetX } from '../generated/Contract/Contract';;
import { SetXEntity } from '../generated/schema';

export function handleSetX(event: SetX): void {
    let entity = SetXEntity.load(event.transaction.hash.toHex());
    if (entity == null) {
        entity = new SetXEntity(event.transaction.hash.toHex());
    }
    // Entity fields can be set based on event parameters
    entity.x = event.params.x;

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[
    {
        "inputs": [],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "constructor"
    },
    {
        "anonymous": false,
        "inputs": [

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pragma solidity ^0.5.0;

import "@openzeppelin/contracts/math/SafeMath.sol";


/**
 * @title Simple Storage
 * @dev A simple way to save a number.
 */
contract SimpleStorage {

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{
  setXEntities(
    where:
    {
      x_gt: 4,
      x_lt: 9,
      timestamp_gt: 1572362160,
      timestamp_lt: 1572362179
    }
  ) {

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type SetXEntity @entity {
  id: ID!
  x: BigInt! # uint256
  by: Bytes!
  timestamp: BigInt! # uint256
}

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eventHandlers:
  - event: SetX(uint256,address,uint256)
  handler: handleSetX

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$ npx truffle console - network development
truffle(development)> simpleStorage = await SimpleStorage.deployed()
truffle(development)> await simpleStorage.set(5)
truffle(development)> await simpleStorage.set(8)

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{
  exampleEntities {
    x
  }
}

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git clone https://github.com/graphprotocol/graph-node/
cd graph-node/docker
./setup.sh
docker-compose up