Questions tagged [multi-index]
Questions related to Multi-Indexes for Smart Contracts Tables
101
questions
0
votes
0answers
13 views
Index - Constructor for must explicitly initialize the member which does not have a default constructor
I try to create two tables and mult_index, I received an error on output.
header file
#include <eosio/eosio.hpp>
#include <eosio/asset.hpp>
using namespace eosio;
CONTRACT game : public ...
0
votes
0answers
6 views
Table values write correctly but fails to read values, possible serialize error
I'm trying to write a contract that has a table with few vectors, even tho it seems to be writing all the values correctly it fails to read the values back.
The structs and tables are bellow:
struct ...
0
votes
0answers
13 views
Using std::map inside multi-index
I was thinking on good practices when creating the persistence using the multi-index API, more specifically regarding future updates to the table model (ie. adding new members to the struct). All the ...
0
votes
0answers
7 views
How to derive a uint from a string to use it as key/index in eosio table
I want to store json key-value pairs in an eosio table. The keys in the json are unique and that's why it would be perfect to use them as primary_key or secondary_id for querying the table later.
The ...
0
votes
2answers
86 views
How to listen/get on-chain data in real time
I know that I can use eosjs to read/query multi_index table data from the chain. However, my goal is to listen to/on these changes. Specifically, I want to receive a notification whenever something ...
0
votes
1answer
25 views
How can I remove a corrupted multiindex table from RAM
Ok, so I made a beginner coding error in a token contract, mis-typing the return value from get without & (yes, I now see the Warning in the docs at https://developers.eos.io/manuals/eosio.cdt/...
0
votes
1answer
20 views
can avaliable_primary_key() re-utilize deleted smaller primary_keys?
"table_name.available_primary_key()," is 'auto incrementing'. Is available_primary_key able to re-use previously deleted primary keys and re-utilize them?
eg. assuming some random ...
0
votes
1answer
46 views
Traverse multi-index table through non-primary value and delete the record
Below is my smart contract:
#include <eosio/eosio.hpp>
#include <eosio/print.hpp>
#include <eosio/system.hpp>
#include <string>
using namespace eosio;
using std::string;
...
0
votes
1answer
26 views
How user data stored on the eos blockchain is compliant with regulations?
I am exploring the eosio software, I was impressed with the ability of eosio of saving user data in a multi index table. While this property is technically really interesting I am trying to find use ...
1
vote
1answer
72 views
How to access data inside multi-index table when using 2D vector / 2D array?
What is going on? :D I write data, but cannot find it after I write it.
The following code successfully emplaces the row into the multi-index table:
See specifically the vector<vector <...
0
votes
1answer
42 views
EOSJS get information about a list of the multi-index table rows
Suppose that I have a user table, where each user has a status.
TABLE user_info {
name username;
uint64_t status = 0;
auto primary_key() const { return username.value; }
};
...
1
vote
1answer
52 views
nested stuff inside index_table
I'm trying to build a small hearthstone like game and I've finished up the front-end for the game client. I created a NoSQL mockup of the user data and now it's time to move those to the index_table ...
0
votes
1answer
41 views
EOSIO unsupported key_type uint64_t
I am using a secondary key to get table rows:
static async getItemById(itemId){
try{
const rpc = new JsonRpc(process.env.REACT_APP_EOS_HTTP_ENDPOINT);
const result = await rpc....
0
votes
1answer
41 views
eoslime test not saving data in table
This is my first experience with eoslime as I want to do unit testing for smart contracts. Not much experienced with nodejs .I am following eoslime documentation: https://docs.eoslime.limechain.tech/...
0
votes
2answers
100 views
how to define a vector with fixed size?
I want to define a vector of strings with a fixed size 3 in the multi-index table of smart contract. I search and tried different ways which I found for CPP vector like:
std::vector<string> abc(...
0
votes
0answers
57 views
How to set vector type field as a secondary index in smart contract?
I want to set a group vector as a secondary index in the user smart contract. group is the list of groups.
Following is the changes I am doing:
struct [[eosio::table]] usertable {
...
0
votes
1answer
221 views
Multiple smart contracts with single account
I have three smart contracts (A, B, C) and one account (X). As the requirement is I just need only one authority (administrator) who is going to manage all these smart contracts data. So I deployed ...
0
votes
1answer
135 views
How do I lookup multiple entries by same secondary indices with more than limit entries?
I have a table with a lot of entries. I want to iterate through all the rows by the same secondary index on multiple pages.
TABLE post {
uint64_t id;
name author;
string text;...
0
votes
1answer
62 views
Is it possible to add a secondary index to a table that already exists and contains entries?
If a table already exists in a smart contract on-chain and the table is full of entries, is it possible to make a secondary index for that table? Or would you have to create a new table and migrate ...
0
votes
1answer
67 views
Is there way to retrieve auto incremented primary key after submission of transaction?
I'm working on sample dApp application to understand the working of multi_index table in EOS smart contract.
I have defined two multi_index table. The primary key of table1 is auto incremented using "...
0
votes
2answers
168 views
Use UUID as primary key in multi_index
How can I use a uuid as the primary.
struct [[eosio::table]] blackboxdata {
name user;
std::string uuid;
std::string hash;
std::string sqlrequest;
uint64_t ...
0
votes
1answer
76 views
Is it possible to see the RAM delta of a multi_index table operation, or see who is currently paying for a row in a table
My question is in the context of smart contract development, so I'm looking for solutions that work within smart contracts:
1st: Is is possible to see the RAM delta of either an individual ...
0
votes
1answer
90 views
Of what type is the return value of get_index?
Every single example out there that shows how to use a secondary index in the EOSIO platform, including the scant documentation on the function found here: https://eosio.github.io/eosio.cdt/latest/...
0
votes
1answer
142 views
How to retrieve filtered multi-index table data?
I have a smart contract that has a multi-index table called reservations - account, time, date, entity. From the code I am trying to use get_table_rows to get all reservations related to a given ...
0
votes
0answers
43 views
Code abstraction
I need a little guidance. I've been structuring my code like this:
#include <eosio/eosio.hpp>
class [[eosio::contract("table")]] Square {
private:
struct [[eosio::table]] square {
...
0
votes
1answer
2k views
call to implicitly-deleted copy constructor
I'm unable to compile a small test contract and am hoping for guidance. I have a class called Account, in the following 2 files:
// --- account.hpp
#pragma once
#include <string>
#include &...
0
votes
1answer
26 views
Why I didn't initialize database?
I want to add the my multi_index in controller db.
And Finally Adding all class is set up. But When eos program initialize the database, it didn't work.
my error log :
/eos/libraries/chainbase/...
0
votes
1answer
401 views
How can we retrieve table data with secondary Index in EOS table
this is my table
struct [[eosio::table]] payment_made
{
uint64_t pay_id;
uint64_t loan_id;
uint64_t pay_amunt;
time_point_sec pay_date_req;
time_point_sec pay_date_approve;
...
0
votes
1answer
51 views
Multi index table asks an unusual permission to emplace new row
Problem
I'm trying to emplace a new row in a multi-index table, but it tells me that I don't have the authotity of the row key name to do it.
Code
Multi-index table definition
struct [[eosio::...
0
votes
1answer
385 views
How to upgrade a multi_index table in a smart contract
I have initially the following multi_index table:
struct [[eosio::table]] plastict
{
uint64_t id;
uint64_t type;
uint64_t primary_key() const { return id; }
};
typedef eosio::multi_index&...
0
votes
2answers
456 views
How to loop a multi_index table in a smart contract
I have very simple table items with the following structure:
struct [[eosio::table]] item
{
uint64_t id;
uint64_t state;
string description;
uint64_t primary_key() ...
0
votes
1answer
103 views
How do I access (sha256) / sort (i128) a secondary/tertiary indices with cleos / curl?
I'm trying to access either of our additional indices of the accountext table. I'm able to access the 3rd index but I'm not sure how to sort it, the second index returns an empty table:
// this I ...
1
vote
1answer
69 views
Unable to make use of secondary index in multi-index table
I am trying to add secondary index to my table so I can use it to query for elements based on it. My struct looks like this:
struct [[eosio::table]] user
{
name userAccount; // user ...
1
vote
2answers
160 views
How do I return an iterator?
I have a multi-index defined such that I can do:
<type?> test() {
myTable t(_self, _self.value);
auto r = t.find(...);
return r;
}
but how do I return the iterator? what is the ...
1
vote
0answers
38 views
Fetching More Table Rows via RPC
I have a contract with a table in it. I'm querying the contents of the table using the RPC interface, but I'm having trouble getting all the rows. To limit the memory usage of my application, I'm ...
2
votes
1answer
325 views
What is the meaning of "scope" in a Smart Contract?
Since I have read the tutorial. I don't understanding the following:
Note that scopes are used to logically separate tables within a
multi-index (see the eosio.token contract multi-index for an ...
1
vote
1answer
510 views
How to create composite primary key?
I have a table of prices where I want to store 2 prices per cross defined like this:
struct [[eosio::table]] _prices {
symbol base;
symbol quote;
float value = 0.0;
uint128_t ...
0
votes
1answer
188 views
How do you define uuid indexes in contract tables?
I would get table entries by uuid. how can I convert string format 16cadf15-dda7-4be2-8026-c3c7875322d0 to an indexable eosio type ( uint64_t, uint128_t, uint256_t, double or long double).
Or even ...
4
votes
2answers
642 views
Get Table Rows with Pagination
How do we get records from a table by pages?
My requirement: I have a table with 100 records and want to display all these records in my front-end-application with 10 records per page and if the user ...
1
vote
1answer
176 views
Retrieve data from multi index table
I found that it is possible to define up to 16 secondary indices for a multi index table. Is it possible to return data from the table using these secondary key?
I have a table like,
result is set as ...
0
votes
1answer
42 views
How is memory aligned in the EOSIO smart contract consensus memory?
Are there any memory savings if I declare a table record that has, say, a 64-bit integer (occupies 8 bytes) and a 16-bit integer (occupies 2 bytes)? Or is it aligned at 64 bits and said record would ...
0
votes
1answer
43 views
why i get "uniqueness constraint was violated" on error on empty table?
i defined a table but i made a mistake putting the fields in wrong order within EOSLIB_SERIALIZE
EOSLIB_SERIALIZE( tablename,(field1)(field4)(field3)(field2));
i did some insertions with emplace ...
1
vote
2answers
67 views
Contract won't keep index count inside index table
Attempting to keep track of an index for future use as an index in another container.
uint64_t namehash = ::eosio::string_to_uint64_t(my_name.c_str());
auto name_iter = ...
6
votes
2answers
1k views
How to use checksum256 secondary index to get table rows
Does anyone know the correct way to get table rows using checksum256 (fixed_bytes<32>) secondary index through the get_table_rows RPC API?
I found a way using key256, but key256 is deprecated ...
2
votes
1answer
208 views
Search multi_index by nonprimary key
#include <eosiolib/eosio.hpp>
using namespace eosio;
class [[eosio::contract("addressbook")]] addressbook : public eosio::contract {
public:
using contract::contract;
addressbook(name ...
0
votes
2answers
197 views
Multi_index issues
I'm getting a lot of errors related to multi_index after updating to the newest eosio.cdt. Here is part of my code related to hash.
struct st_hash {
capi_checksum256 hash;
uint64_t expiration;
...
0
votes
0answers
31 views
why it prints only one "record/row"?
I created a table with 5 rows/records.
I tried to print the whole table content with the following code:
require_auth(_self);
accounts_table accounts(_self, _self.value);
for(auto itr = accounts....
1
vote
2answers
258 views
Is there a way to query table with the value of a particular data field
Is there a way to query table with the value of a particular data field (for example, a token value) when using 'get_table rpc'? Only users whose token value is greater than 30 are output.
1
vote
0answers
41 views
cannot get latest state of table after modifying table in inline action
As shown with code below, I modify table in an inline action, and then want to get the latest data. But the data I get is not the latest. Why?
void mycontract::myfunc()
{
action (
...
2
votes
1answer
356 views
Iterating through secondary indices
I have a table with some secondary indices. I want to iterate through the rows whose values are act >= 1 and discard the rest.
So:
table holders(_self, _self.value);
auto index_by_act = holders....
