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      "parent_permlink": "ethereum",
      "author": "dagrawal",
      "permlink": "web3-js-how-to-search-all-the-contracts-ever-created-by-and-address",
      "title": "web3.js how to search all the contracts ever created by and address",
      "body": "For those who are looking for a way, as Adam said in his post, there is no direct way to find contracts created by wallet address. Hence, we have to implement registry pattern as shown below to keep track of things and just ask that contract in web3.js, also shown below....\n\nThis is how my contract look like\n\n    contract ContractA {\n      bool public is_approved;\n      address public visa_details;\n      uint public artifact_count;\n\n      // constructors\n      function ContractA() public {\n        owner = msg.sender;\n      }\n    }\n\nHere is the registry pattern contract\n\n    contract ContractARegistry {\n      mapping(address => address[]) user_contracts;\n\n      function registerContract(address contractA) public {\n        user_applications[msg.sender].push(contractA) - 1; // -1 is very important\n      }\n\n      function findContract(address user) view public returns (address[]){\n        return user_contracts[user];\n      }\n    }\n \nIn web3.js you may search like this (I am using Angular4) \n\n    import * as ContractA from '../../../../build/contracts/ContractA.json';\n    import * as UserContracts from '../../../../build/contracts/UserContracts.json';\n    import * as TruffleContract from 'truffle-contract';\n    import {Observable} from \"rxjs/Observable\";\n\n    declare var window: any;\n\n\t@Injectable()\n\texport class AppWeb3ContractAService {\n\t  CONTRACT_A = TruffleContract(ContractA);\n\t  USER_CONTRACTS = TruffleContract(UserContracts);\n\n\t  constructor(private appWeb3Svc: AppWeb3Service) {\n\t\tconsole.log(\"Injecting the provider\");\n\t\tthis.CONTRACT_A.setProvider(this.appWeb3Svc.currentProvider());\n\t\tthis.USER_CONTRACTS.setProvider(this.appWeb3Svc.currentProvider());\n\t  }\n\n\t  create(ethAddress): Observable<any> {\n\t\treturn Observable.create(observer => {\n\t\t  this.CONTRACT_A\n\t\t\t.new({\n\t\t\t  from: ethAddress\n\t\t\t})\n\t\t\t.then(application => {\n\t\t\t  this.USER_CONTRACTS\n\t\t\t\t.deployed()\n\t\t\t\t.then(registry => {\n\t\t\t\t  registry.registerContractA(application.address, {from: ethAddress})\n\t\t\t\t\t.then(result => observer.next(application))\n\t\t\t\t\t.catch(error => observer.error(error));\n\t\t\t\t})\n\t\t\t\t.catch(error => observer.error(error));\n\t\t\t})\n\t\t\t.catch(error => observer.error(error));\n\t\t});\n\t  }\n\n\n\t  findAll(ethAddress: string):\n\t\tObservable<any[]> {\n\t\treturn Observable.create(observer => {\n\t\t  this.USER_CONTRACTS\n\t\t\t.deployed()\n\t\t\t.then(registry => {\n\t\t\t  registry.findUserContracts(ethAddress, {from: ethAddress})\n\t\t\t\t.then(addresses => {\n\t\t\t\t  addresses.forEach(address => observer.next(this.CONTRACT_A.at(address)));\n\t\t\t\t})\n\t\t\t\t.catch(error => observer.error(error));\n\t\t\t})\n\t\t\t.catch(error => observer.error(error));\n\t\t});\n\t  }\n\t}\n\n\nThis is how my appWeb3Svc looks like\t\n\n\t\n    import {Injectable} from '@angular/core';\n\timport {environment} from '../../../environments/environment';\n\timport * as Web3 from 'web3';\n\n\tdeclare var window: any;\n\n\t@Injectable()\n\texport class AppWeb3Service {\n\t  public web3: Web3;\n\n\t  checkAndInstantiateWeb3 = () => {\n\t\t// Checking if Web3 has been injected by the browser (Mist/MetaMask)\n\t\tif (typeof window.web3 !== 'undefined') {\n\t\t  console.warn(\n\t\t\t'Using web3 detected from external source. If you find that your accounts don\\'t appear or you have 0 MetaCoin, ensure you\\'ve configured that source properly. If using MetaMask, see the following link. Feel free to delete this warning. :) http://truffleframework.com/tutorials/truffle-and-metamask'\n\t\t  );\n\t\t  // Use Mist/MetaMask's provider\n\t\t  this.web3 = new Web3(window.web3.currentProvider);\n\t\t} else {\n\t\t  console.warn(\n\t\t\t'No web3 detected. Falling back to ${environment.HttpProvider}. You should remove this fallback when you deploy live, as it\\'s inherently insecure. Consider switching to Metamask for development. More info here: http://truffleframework.com/tutorials/truffle-and-metamask'\n\t\t  );\n\t\t  // fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail)\n\t\t  this.web3 = new Web3(\n\t\t\tnew Web3.providers.HttpProvider(environment.HttpProvider)\n\t\t  );\n\t\t}\n\t  };\n\n\t  constructor() {\n\t\tthis.checkAndInstantiateWeb3();\n\t  }\n\n\t  currentProvider() {\n\t\treturn this.web3.currentProvider;\n\t  }\n\n\t  eth() {\n\t\treturn this.web3.eth;\n\t  }\n\n\t  isAddress(ethAddress: string): boolean {\n\t\tif (this.web3) {\n\t\t  return this.web3.isAddress(ethAddress);\n\t\t}\n\t\treturn false\n\t  }\n\t}\n\t\nHope this helps!",
      "json_metadata": "{\"tags\":[\"ethereum\",\"erc-20\",\"solidity\",\"angularjs\",\"web3\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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      "permlink": "web3-js-how-to-search-all-the-contracts-ever-created-by-and-address",
      "title": "web3.js how to search all the contracts ever created by and address",
      "body": "For those who are looking for a way, as Adam said in his post, there is no direct way to find contracts created by wallet address. Hence, we have to implement registry pattern as shown below to keep track of things and just ask that contract in web3.js, also shown below....\n\nThis is how my contract look like\n\n    contract ContractA {\n      bool public is_approved;\n      address public visa_details;\n      uint public artifact_count;\n\n      // constructors\n      function ContractA() public {\n        owner = msg.sender;\n      }\n    }\n\nHere is the registry pattern contract\n\n    contract ContractARegistry {\n      mapping(address => address[]) user_contracts;\n\n      function registerContract(address contractA) public {\n        user_applications[msg.sender].push(contractA) - 1; // -1 is very important\n      }\n\n      function findContract(address user) view public returns (address[]){\n        return user_contracts[user];\n      }\n    }\n \nIn web3.js you may search like this (I am using Angular4) \n\n    import * as ContractA from '../../../../build/contracts/ContractA.json';\n    import * as UserContracts from '../../../../build/contracts/UserContracts.json';\n    import * as TruffleContract from 'truffle-contract';\n    import {Observable} from \"rxjs/Observable\";\n\n    declare var window: any;\n\n\t@Injectable()\n\texport class AppWeb3ContractAService {\n\t  CONTRACT_A = TruffleContract(ContractA);\n\t  USER_CONTRACTS = TruffleContract(UserContracts);\n\n\t  constructor(private appWeb3Svc: AppWeb3Service) {\n\t\tconsole.log(\"Injecting the provider\");\n\t\tthis.CONTRACT_A.setProvider(this.appWeb3Svc.currentProvider());\n\t\tthis.USER_CONTRACTS.setProvider(this.appWeb3Svc.currentProvider());\n\t  }\n\n\t  create(ethAddress): Observable<any> {\n\t\treturn Observable.create(observer => {\n\t\t  this.CONTRACT_A\n\t\t\t.new({\n\t\t\t  from: ethAddress\n\t\t\t})\n\t\t\t.then(application => {\n\t\t\t  this.USER_CONTRACTS\n\t\t\t\t.deployed()\n\t\t\t\t.then(registry => {\n\t\t\t\t  registry.registerContractA(application.address, {from: ethAddress})\n\t\t\t\t\t.then(result => observer.next(application))\n\t\t\t\t\t.catch(error => observer.error(error));\n\t\t\t\t})\n\t\t\t\t.catch(error => observer.error(error));\n\t\t\t})\n\t\t\t.catch(error => observer.error(error));\n\t\t});\n\t  }\n\n\n\t  findAll(ethAddress: string):\n\t\tObservable<any[]> {\n\t\treturn Observable.create(observer => {\n\t\t  this.USER_CONTRACTS\n\t\t\t.deployed()\n\t\t\t.then(registry => {\n\t\t\t  registry.findUserContracts(ethAddress, {from: ethAddress})\n\t\t\t\t.then(addresses => {\n\t\t\t\t  addresses.forEach(address => observer.next(this.CONTRACT_A.at(address)));\n\t\t\t\t})\n\t\t\t\t.catch(error => observer.error(error));\n\t\t\t})\n\t\t\t.catch(error => observer.error(error));\n\t\t});\n\t  }\n\t}\n\n\nThis is how my appWeb3Svc looks like\t\n\n\t\n    import {Injectable} from '@angular/core';\n\timport {environment} from '../../../environments/environment';\n\timport * as Web3 from 'web3';\n\n\tdeclare var window: any;\n\n\t@Injectable()\n\texport class AppWeb3Service {\n\t  public web3: Web3;\n\n\t  checkAndInstantiateWeb3 = () => {\n\t\t// Checking if Web3 has been injected by the browser (Mist/MetaMask)\n\t\tif (typeof window.web3 !== 'undefined') {\n\t\t  console.warn(\n\t\t\t'Using web3 detected from external source. If you find that your accounts don\\'t appear or you have 0 MetaCoin, ensure you\\'ve configured that source properly. If using MetaMask, see the following link. Feel free to delete this warning. :) http://truffleframework.com/tutorials/truffle-and-metamask'\n\t\t  );\n\t\t  // Use Mist/MetaMask's provider\n\t\t  this.web3 = new Web3(window.web3.currentProvider);\n\t\t} else {\n\t\t  console.warn(\n\t\t\t'No web3 detected. Falling back to ${environment.HttpProvider}. You should remove this fallback when you deploy live, as it\\'s inherently insecure. Consider switching to Metamask for development. More info here: http://truffleframework.com/tutorials/truffle-and-metamask'\n\t\t  );\n\t\t  // fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail)\n\t\t  this.web3 = new Web3(\n\t\t\tnew Web3.providers.HttpProvider(environment.HttpProvider)\n\t\t  );\n\t\t}\n\t  };\n\n\t  constructor() {\n\t\tthis.checkAndInstantiateWeb3();\n\t  }\n\n\t  currentProvider() {\n\t\treturn this.web3.currentProvider;\n\t  }\n\n\t  eth() {\n\t\treturn this.web3.eth;\n\t  }\n\n\t  isAddress(ethAddress: string): boolean {\n\t\tif (this.web3) {\n\t\t  return this.web3.isAddress(ethAddress);\n\t\t}\n\t\treturn false\n\t  }\n\t}\n\t\nHope this helps!",
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      "body": "Pretty much the same outlook I have. I think this, cardano and iota will be ones to watch.",
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      "body": "Hey mate, I like the thought process behind PowerLedger. I believe in what they are doing as the team look strong and the idea is linked to renewable energy which is the future. I am not a pro in crypto but I feel good about them.\n\nI have invested but not much as they have lot to accomplish.",
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      "title": "Dont have money to invest in crypto's?",
      "body": "Almost everyone have heard and know something about crypto currencies, specifically BITCOIN, but failed to invest in something which is not tangible. And due to this mental block has lost possible profits.\n\nDon't worry I was in the same boat and now (better late than never), started investing in crypto's. As lot of authors here, advised, invest whatever you can and ready to loose. \n\nI started my journey with those forgotten fiat coins which I tossed in the drawers, under the bed, on the table because they were to heavy and messy to carry in my pocket. I started collecting all these coins (a dollar, a penny, a quarter) and you will wonder how much money, like this, you will find lying around in your house or office. Just collect them and use them to buy crypto's. What worse could happen to them, they are already forgotten by you, you do not consider them money. If you loose them it will not matter. \n\nEven investing 10$ a week can make you profit. I am doing it and converting my coins into real money. You can also do it. I bet in no time you will have a decent investment profile.\n\nHope this will motivate you to invest and have the pleasure of earning something extra on the side.",
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