I am trying to connect two different Smart Contracts using interfaces. Here is my contract CRUD.sol: // SPDX-License-Identifier: MIT pragma solidity ^0.8.4;
contract CRUD { struct Data { uint id; bytes32 contentHash; string description; } // Variables de estado Data[] data; uint nextId; // Operaciones CRUD: CREATE, READ, UPDATE y DELETE: // Operación CREATE function createData(string memory _description) public{ bytes32 contentHash = createHash(_description); data.push(Data(nextId, contentHash, _description)); nextId++; } // Operación READ por búsqueda del id function readData(uint _id) public view returns (uint, bytes32,string memory) { uint index = findIndex(_id); return (data[index].id, data[index].contentHash, data[index].description); } // Operación READ por búsqueda del hash de la entrada de datos function readDataByHash(bytes32 _hash) public view returns (uint, bytes32,string memory) { uint index = findByHash(_hash); return (data[index].id, data[index].contentHash, data[index].description); } //Operacion READ todos las entradas de datos function readAllData() external view returns (Data[] memory){ return data; } function count() external view returns (uint){ return data.length; } // Operación UPDATE function updateData(uint _id, string memory _description) public returns (uint, bytes32, string memory){ uint index = findIndex(_id); bytes32 contentHash = createHash(_description); data[index].contentHash= contentHash; data[index].description = _description; return (data[index].id, data[index].contentHash, data[index].description); } // Operación DELETE function deleteData(uint _id) public{ uint index = findIndex(_id); delete data[index]; } // Creación del hash function createHash(string memory _description) internal pure returns (bytes32){ return keccak256(abi.encodePacked(_description)); } // Búsqueda del id function findIndex(uint _id) internal view returns (uint) { for (uint i = 0; i < data.length; i++) { if (data[i].id == _id) { return i; } } revert("Data not found"); } // Busqueda por el hash de la entrada de datos function findByHash(bytes32 _contentHash) internal view returns (uint) { for (uint i = 0; i < data.length; i++) { if (data[i].contentHash == _contentHash) { return i; } } revert("Data not found"); } } Here is the other contract:
// SPDX-License-Identifier: MIT pragma solidity ^0.8.4; interface ICRUD{ function readAllData() external view returns (Data[] memory); } contract verifyData{ function read() external view returns (Data[] memory){ Data[] data = ICRUD(0xd9145CCE52D386f254917e481eB44e9943F39138).readAllData(); return data; } } My purpose is to call readAllData function from verifyData contract but Remix just keeps returning the following error:
DeclarationError: Identifier not found or not unique. --> verifyData.sol:5:51: | 5 | function readAllData() external view returns (Data[] memory); | ^^^^ Can someone help me? Thanks
