Fix CLOB/BLOB insertion when prepared_statements is false #2485
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This was referenced Jan 26, 2026
When prepared_statements is disabled, INSERT statements use empty_clob()/ empty_blob() literals instead of bind parameters. The LOB module previously only had after_update callbacks, causing LOB data to be lost on INSERT. This commonly occurs in Rails 8 development environments where config.active_record.query_log_tags_enabled = true (the default) causes Rails to automatically disable prepared statements. Changes: - Add before_create :record_lobs_for_create callback - Add after_create :enhanced_write_lobs callback - Add record_lobs_for_create method to track non-nil LOB columns on create - Skip callback when prepared_statements is enabled (LOB data already written via temporary LOB binding in type_cast()) Fixes rsim#2477 (CLOBs empty after creation) Fixes rsim#2483 (redundant double-write with prepared statements)
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Summary
prepared_statements: falseprepared_statements: trueThis commonly occurs in Rails 8 development environments where
config.active_record.query_log_tags_enabled = true(the default) causes Rails to automatically disable prepared statements.Changes
before_create :record_lobs_for_createcallbackafter_create :enhanced_write_lobscallbackrecord_lobs_for_createmethod to track non-nil LOB columns on createprepared_statementsis enabled (LOB data already written via temporary LOB binding intype_cast())Test plan
prepared_statements: falseFixes #2477
Fixes #2483