I can help you prevent the problem you are experiencing with Solana’s Memfilter Memcmp. The error message indicates that there is no attribute called “offset”. Here is a step by step to solving this problem:
Understanding Context
Memcmp usally use the following options:
Memcpopts: Memcmp Query Options.
- “DATASLICEOPT”: Data Slice Comparison Options.
When Executing a Memfilter Query, You Need To Provide Keys and Offset (or Slice) to Filter the Data. The shift is used to determine which memory slices compare.
Possible Causes of Error
1
Incorrect Key Structure : Make Sure the Keys are in the Correct Memcmp Format. Keys should be lists or lists containing the address “and reference to” Pubkey “,” Index “or other value.
- Missing Offset
: Make Sure you provide a shift when executing the query. If the offset is not provided, Solana’s default default level will be 0.
3
Invalid Slice Comparison : Check If Your Slice Comparisons Are Correct. Memcmp slices can be compared using different operators (eg, ==, ! =, <, >, Etc.).
Solution of the question
- check the main structure : review the keys and make sure they meet the memcmp requirements. You can use tools such as "Solana-key-util" or print the key to check their format.
- Provide a shift (IF NECESSARY) : If you use a specific slice Comparison Operator, make sure to provide the shift as required by this operator. For example, if you compare slices based on their addresses, you will need to specify the "offset" key in your memcpopt structure.
3
Check slices comparisons : Double Check Slices Comparisons to make sure they are correct. You can use tools such as "Solana-Key-Urtles" or print key to text their format and correctness.
Sample Code
`Python
from solana.rpc.types Imports Memcpopt, DATASLICEOPT
Create A Sample Key Tuple With A Shift 0
Key = ("My_key", {"Address": "My_pubkey", "Index": 1})
Create a Memcpopt Structure with a key and a shift
Choose = memcpopt (
Key = key,
Slice = "Dat_slice",
Operator = "==",
Example Comparison Operator
)
Follow The Memphilter Query
Score = Wait for Mem_Filter (Selects)
In this example, we create a sample "keys" with a shift. Finally, we execute a memory query using the mem_filter ().
I hope this will help you solve this issue! If you have any other questions or need more help, be sure to ask.