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    adhikarideepak
    @adhikarideepak
    Hi All
    is there any concept where we can use any database (like mysql or postgress )with smart contract or blockchain?
    if yes how can I implement it ?
    please share your views
    Thanks
    Nick Mudge
    @mudgen_twitter
    cryptogee
    @cryptogee
    Does anybody know how to resolve the url not parseableFile.sol error in remix? Am trying to create a child file and remix won't compile, am totally stuck.
    @mudgen_twitter Sorry, would love to help but that is way beyond me at the moment.
    adhikarideepak
    @adhikarideepak
    Can somebody help me to create a small app using smart contract with some UI, except pet shop ?
    Help will be appreciated
    Thanks
    luckyyousc
    @luckyyousc
    Hello everyone,just created a lottery game as smart contract ,can you give me some advice ? see more http://luckyyou.io
    Lee Raj
    @lerajk
    @adhikarideepak depends on your use, with some applications it makes sense to store data with a database & call the required functions from the smart contracts with an API like web3 or ethersjs. But if you are looking to bypass SQL/NoSQL databases check IPFS. Storage in blockchain is still a big issue though.
    adhikarideepak
    @adhikarideepak
    Thanks @lerajk , for your this information, I will check IPFS once
    cryptogee
    @cryptogee
    Anybody know how to create a parent/child function within a contract? Example: Crowdfunding app - Function: createCompany (parent) Function: createToken (child)
    Maurelian
    @maurelian
    @cryptogee I don't know what you mean, but your best bet is probably to read the inheritance section: https://solidity.readthedocs.io/en/latest/contracts.html#inheritance
    the 'super' keyword might be relevant to you
    Laxman Tukadiya
    @laxman810_gitlab
    Hello everyone
    can anyone help to get some simple tutorials for smart contract with front-end and database DAPP ?
    Peteris Erins
    @Pet3ris
    What are the state-of-the-art approaches today to understand why a transaction was reverted?
    Anubhav Gupta
    @array-addu
    Need to create a contest app, where many contests will run parallely and there will be N no of players in each contest. There is also joining fee and winning amount for every contest. What is the best to design the contract?
    Michael Rice
    @mrice
    @Pet3ris - the truffle debugger is getting there
    Makoto Inoue
    @makoto
    Hello. I just wrote a blog post of auditing my own smart contract. Hope this is helpful to the audience here https://medium.com/@makoto_inoue/self-audit-a-new-bug-and-call-for-community-auditing-of-blockparty-e774a8596496
    Maurelian
    @maurelian
    Thanks for sharing @makoto!
    Makoto Inoue
    @makoto
    Hopefully people can learn from my stupid mistakes...
    lpw
    @lpwlpw
    Thanks
    Jimmy987
    @Jimmy987
    ``` (shift+enter for line break)
    var gas = await commitFunction.EstimateGasAsync(
    platformAccount.Address,
    new Nethereum.Hex.HexTypes.HexBigInteger(15000),
    new HexBigInteger(Nethereum.Util.UnitConversion.Convert.ToWei(0)),
    id.HexToByteArray()).ConfigureAwait(false);
    ```
    ```var gas = await commitFunction.EstimateGasAsync(platformAccount.Address, new Nethereum.Hex.HexTypes.HexBigInteger(15000), new HexBigInteger(Nethereum.Util.UnitConversion.Convert.ToWei(0)), id.HexToByteArray()).ConfigureAwait(false);```
    I wanna estimate gas, but got error: gas required exceeds allowance or always failing transaction.
    It work fine at last week, but this week it works error, it so confuse to me.
    Jimmy987
    @Jimmy987
    Can anyone help?
    Thanks
    kashifaa
    @kashifaa
    Hi Everyone
    After doing all steps successfull when I try to execute contract , there is error TypeError: LoginContract.LoginAttempt is not a function
    Contract is unable to find its method , what can be possible mistake here ...
    or can some body give me some example about new web3.eth.Contract(jsonInterface[, address][, options])
    Micah Dameron
    @chronaeon
    Jimmy and kashifaa, this is a channel for best practices discussion. You're not describing best practices, but asking for help with arbitrary behavior in your own code. Please ask your questions in the ethereum/solidity gitter
    Anubhav Gupta
    @array-addu
    I have a requirement where we need to save data(pdf) to blockchain so that any third party can access and view it later by the block address. I can't store the hash of the data on blockchain as the third party does not have access to the original document to verify the hash of the data. Is it feasible?
    Foluso
    @foogunlana
    @array-addu I often see people store data on IPFS and then hashes in the blockchain. But I'm not completely clear on what the problem is. Do you just need data storage? IPFS, Swarm and other solutions exist for that. Or are you trying to restrict access by some permissions or authorization
    Wappnet Systems
    @WappnetS_twitter
    Hello Everyone
    I need Help to implement whitelist addresses contract in my existing smartcontract
    anyone can help me ?
    Yasin Shuman
    @yshuman1
    hey all, is there a channel dedicated to testing contracts?
    Maurelian
    @maurelian
    @yshuman1 not to my knowledge, but consensys/truffle will probably discuss testing a fair bit
    Nico Vergauwen
    @kyriediculous

    Anyone familiar here with inline assembly? I've tried like everywhere.
    I'm trying to make a low level dispatcher. What is different from existing implementations is that I Need to load in a struct from storage to pass as a param to the library I'm delegating to. I'd also need to split the calldata and put that storage struct in between.
    Here's the issue on github: ethereum/solidity#4854

    Any help gets huge kudos in my extensive blogpost on smart contract architecture :)

    You might ask ,why don't you just write functions that delegate to the library directly without assembly? Because that doesn't save any gas despite many people thinking it does. Making this issue work would reduce deployment gas cost of instances delegating to the logic of the library by more than half. This has enormous positive implications for example identity, where it becomes way cheaper than the current price of 0.30$ to deploy the uPort contract.
    Maurelian
    @maurelian
    @kyriediculous the best resource I know of is the solidity documentation.
    You might find this bytes library a useful resource: https://github.com/0xProject/0x-monorepo/blob/development/packages/contracts/src/2.0.0/utils/LibBytes/LibBytes.sol
    Anubhav Gupta
    @array-addu
    I need to store and retrieve multiple values in key value pair, can someone suggest me the best way to achieve this?
    Amol🕶
    @Amol_Sharma_twitter
    Hi I am new here, anyone has a "best practices for smart contract" link/URL/document?
    ThisIsCodeXpert
    @ThisIsCodeXpert
    Amol🕶
    @Amol_Sharma_twitter
    Thanks @ThisIsCodeXpert
    Devashish Tomar
    @dev1644
    Hi There,
    Can I ask a question about Crowdsale Contract?
    Devashish Tomar
    @dev1644
    How can I link the price of a token to a fiat Currency in Smart Contract.
    Aside Oracle can there be another approach to it ?
    Shashikant Soni
    @shashiks
    @dev1644 Since fiat prices are not available on Blockchains. Your best option is an oracle. No I haven't heard of any alternate approach around this