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Before you continue, I'm assuming you know what The Graph is and what problems it tackles. If you haven't, I highly recommend checking out - Why The Graph.
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In this tutorial I'll be using a simple Gravity contract as an example.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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The job of mappings file (in ./src/mapping.ts) is to convert data coming from blockchain (e.g. events) to an entity defined in the schema.graphql and write it to store. The mappings are written in AssemblyScript which can be compiled to WASM. It is a stricter subset of TypeScript. If you've never written any TypeScript ever, I recommend getting familiar with the syntax here.
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truffle
Discontinued :warning: The Truffle Suite is being sunset. For information on ongoing support, migration options and FAQs, visit the Consensys blog. Thank you for all the support over the years.
If not provided inline to graph init, the cli will try to fetch the ABI of the contract from Etherscan. If not found, you'll need to provide path to the ABI file of the contract. ABI is easy to generate for your contract through dev tools like Hardhat or Truffle, one of which you might already be using. Or, you can simply copy it from IDE, if you're using Remix. In our case, ABI was already available on Etherscan.
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metamask-extension
:globe_with_meridians: :electric_plug: The MetaMask browser extension enables browsing Ethereum blockchain enabled websites
Before you can use the already installed Graph CLI, head over to the Subgraph Studio and connect your account. You'll need a wallet like MetaMask already installed on your browser. So make sure it is there.
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hardhat
Hardhat is a development environment to compile, deploy, test, and debug your Ethereum software.
If not provided inline to graph init, the cli will try to fetch the ABI of the contract from Etherscan. If not found, you'll need to provide path to the ABI file of the contract. ABI is easy to generate for your contract through dev tools like Hardhat or Truffle, one of which you might already be using. Or, you can simply copy it from IDE, if you're using Remix. In our case, ABI was already available on Etherscan.
