ActiveRecord::StatementInvalid

ActiveRecord::StatementInvalid is raised when an SQL statement is invalid or fails to execute. This wraps database-specific errors like syntax errors, constraint violations, or missing columns.

Common causes

• SQL syntax error in raw queries
• Referencing non-existent column
• Foreign key constraint violation
• Migration not run (missing table/column)
• Database-specific SQL incompatibility

How to fix it

• Run pending migrations: rails db:migrate
• Check for typos in column names
• Use ActiveRecord query methods instead of raw SQL
• Verify foreign key relationships
• Check database-specific SQL syntax

Example

# Error example
User.where("nonexistent_column = ?", value)
# => ActiveRecord::StatementInvalid: PG::UndefinedColumn: column "nonexistent_column" does not exist

# Fix by checking column exists
if User.column_names.include?('status')
  User.where(status: 'active')
end

# Run migrations
# $ rails db:migrate

# Use proper ActiveRecord methods
User.where(status: 'active')  # Safe, uses prepared statements

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