Problem

When iterating over query results that include blob columns (like F32_BLOB vectors), CLibsql::Slice#to_blob throws:

/lib/libsql.rb:167:in `to_blob': uninitialized constant CLibsql::Slice::Blob (NameError)
        b = Blob.new self[:ptr].read_string self[:len]
            ^^^^

Root Cause

In lib/libsql.rb, the Slice class (line 162) is defined inside the CLibsql module. Its to_blob method (line 166-170) calls Blob.new:

def to_blob
  b = Blob.new self[:ptr].read_string self[:len]
  deinit
  b
end

However, Blob is defined as Libsql::Blob (line 265), not CLibsql::Blob. Ruby's constant lookup searches:

• CLibsql::Slice::Blob (not found)
• CLibsql::Blob (not found)
• ::Blob (not found)

Solution

Change line 167 to use the fully qualified constant:

b = Libsql::Blob.new self[:ptr].read_string self[:len]

Reproduction

require 'libsql'

db = Libsql::Database.new(path: 'test.db')
conn = db.connect

# Create table with blob column
conn.execute("CREATE TABLE test (id INTEGER PRIMARY KEY, data BLOB)")
conn.execute("INSERT INTO test (data) VALUES (?)", ["\x00\x01\x02".b])

# This crashes when iterating results with blob columns
conn.query("SELECT * FROM test").each { |row| p row }

Workaround

Users can apply this monkey-patch before using blobs:

CLibsql.const_set(:Blob, Libsql::Blob) unless defined?(CLibsql::Blob)

Version

turso_libsql 0.2.1