Class: PgSqlTriggers::DatabaseIntrospection

Inherits:
Object
  • Object
show all
Defined in:
lib/pg_sql_triggers/database_introspection.rb

Constant Summary collapse

DEFAULT_EXCLUDED_TABLES =

Default tables to exclude from listing (Rails defaults and pg_sql_triggers internal tables)

%w[
  ar_internal_metadata
  schema_migrations
  pg_sql_triggers_registry
  trigger_migrations
].freeze

Instance Method Summary collapse

Instance Method Details

#excluded_tables ⇒ Object

Get list of all excluded tables (defaults + user-configured)



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 14

def excluded_tables
  (DEFAULT_EXCLUDED_TABLES + Array(PgSqlTriggers.excluded_tables)).uniq
end

#function_exists?(function_name) ⇒ Boolean

Check if function exists

Returns:

  • (Boolean) 


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# File 'lib/pg_sql_triggers/database_introspection.rb', line 109

def function_exists?(function_name)
  sql = <<~SQL.squish
    SELECT COUNT(*) as count
    FROM pg_proc
    WHERE proname = '#{sanitize(function_name)}'
  SQL

  result = ActiveRecord::Base.connection.execute(sql).first
  result["count"].to_i.positive?
end

#list_tables ⇒ Object

Get list of all user tables in the database



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 19

def list_tables
  sql = <<~SQL.squish
    SELECT table_name
    FROM information_schema.tables
    WHERE table_schema = 'public'
    AND table_type = 'BASE TABLE'
    ORDER BY table_name
  SQL

  result = ActiveRecord::Base.connection.execute(sql)
  tables = result.pluck("table_name")
  tables.reject { |table| excluded_tables.include?(table) }
rescue StandardError => e
  Rails.logger.error("Failed to fetch tables: #{e.message}") if defined?(Rails.logger)
  []
end

#table_columns(table_name) ⇒ Object

Get table columns



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 89

def table_columns(table_name)
  sql = <<~SQL.squish
    SELECT column_name, data_type, is_nullable
    FROM information_schema.columns
    WHERE table_schema = 'public'
    AND table_name = '#{sanitize(table_name)}'
    ORDER BY ordinal_position
  SQL

  result = ActiveRecord::Base.connection.execute(sql)
  result.map do |row|
    {
      name: row["column_name"],
      type: row["data_type"],
      nullable: row["is_nullable"] == "YES"
    }
  end
end

#table_triggers(table_name) ⇒ Object

Get triggers for a specific table



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 204

def table_triggers(table_name)
  # From registry
  registry_triggers = PgSqlTriggers::TriggerRegistry.for_table(table_name)

  # From database
  db_triggers_sql = <<~SQL.squish
    SELECT#{' '}
      t.tgname as trigger_name,
      p.proname as function_name,
      pg_get_triggerdef(t.oid) as trigger_definition
    FROM pg_trigger t
    JOIN pg_class c ON t.tgrelid = c.oid
    JOIN pg_proc p ON t.tgfoid = p.oid
    JOIN pg_namespace n ON c.relnamespace = n.oid
    WHERE NOT t.tgisinternal
    AND c.relname = '#{sanitize(table_name)}'
    AND n.nspname = 'public'
    ORDER BY t.tgname
  SQL

  db_triggers = []
  begin
    result = ActiveRecord::Base.connection.execute(db_triggers_sql)
    result.each do |row|
      db_triggers << {
        trigger_name: row["trigger_name"],
        function_name: row["function_name"],
        definition: row["trigger_definition"]
      }
    end
  rescue StandardError => e
    Rails.logger.error("Failed to fetch database triggers: #{e.message}")
  end

  {
    table_name: table_name,
    registry_triggers: registry_triggers,
    database_triggers: db_triggers
  }
end

#tables_with_triggers ⇒ Object

Get all tables with their triggers and functions



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 140

def tables_with_triggers
  # Get all tables
  tables = list_tables

  # Get all triggers from registry
  triggers_by_table = PgSqlTriggers::TriggerRegistry.all.group_by(&:table_name)

  # Get actual database triggers
  db_triggers_sql = <<~SQL.squish
    SELECT#{' '}
      t.tgname as trigger_name,
      c.relname as table_name,
      p.proname as function_name,
      pg_get_triggerdef(t.oid) as trigger_definition
    FROM pg_trigger t
    JOIN pg_class c ON t.tgrelid = c.oid
    JOIN pg_proc p ON t.tgfoid = p.oid
    JOIN pg_namespace n ON c.relnamespace = n.oid
    WHERE NOT t.tgisinternal
    AND n.nspname = 'public'
    ORDER BY c.relname, t.tgname
  SQL

  db_triggers = {}
  begin
    result = ActiveRecord::Base.connection.execute(db_triggers_sql)
    result.each do |row|
      table_name = row["table_name"]
      db_triggers[table_name] ||= []
      db_triggers[table_name] << {
        trigger_name: row["trigger_name"],
        function_name: row["function_name"],
        definition: row["trigger_definition"]
      }
    end
  rescue StandardError => e
    Rails.logger.error("Failed to fetch database triggers: #{e.message}")
  end

  # Combine registry and database triggers
  tables.map do |table_name|
    registry_triggers = triggers_by_table[table_name] || []
    db_table_triggers = db_triggers[table_name] || []

    {
      table_name: table_name,
      registry_triggers: registry_triggers.map do |t|
        {
          id: t.id,
          trigger_name: t.trigger_name,
          function_name: t.definition.present? ? JSON.parse(t.definition)["function_name"] : nil,
          enabled: t.enabled,
          version: t.version,
          source: t.source,
          function_body: t.function_body
        }
      end,
      database_triggers: db_table_triggers,
      trigger_count: registry_triggers.count + db_table_triggers.count
    }
  end
end

#trigger_exists?(trigger_name) ⇒ Boolean

Check if trigger exists

Returns:

  • (Boolean) 


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# File 'lib/pg_sql_triggers/database_introspection.rb', line 121

def trigger_exists?(trigger_name)
  sql = <<~SQL.squish
    SELECT COUNT(*) as count
    FROM pg_trigger t
    JOIN pg_class c ON t.tgrelid = c.oid
    JOIN pg_namespace n ON c.relnamespace = n.oid
    WHERE t.tgname = '#{sanitize(trigger_name)}'
    AND n.nspname = 'public'
    AND NOT t.tgisinternal
  SQL

  result = ActiveRecord::Base.connection.execute(sql).first
  result["count"].to_i.positive?
rescue StandardError => e
  Rails.logger.error("Failed to check if trigger exists: #{e.message}") if defined?(Rails.logger)
  false
end

#validate_table(table_name) ⇒ Object

Validate that a table exists



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# File 'lib/pg_sql_triggers/database_introspection.rb', line 37

def validate_table(table_name)
  return { valid: false, error: "Table name cannot be blank" } if table_name.blank?

  # Use case-insensitive comparison and sanitize input
  sanitized_name = sanitize(table_name)

  # First, check if table exists and get column count
  column_count_sql = <<~SQL.squish
    SELECT COUNT(*) as column_count
    FROM information_schema.columns
    WHERE table_schema = 'public'
    AND LOWER(table_name) = LOWER('#{sanitized_name}')
  SQL

  column_result = ActiveRecord::Base.connection.execute(column_count_sql).first
  column_count = column_result ? column_result["column_count"].to_i : 0

  if column_count.positive?
    # Get table comment separately
    comment_sql = <<~SQL.squish
      SELECT obj_description(c.oid, 'pg_class') as comment
      FROM pg_class c
      JOIN pg_namespace n ON n.oid = c.relnamespace
      WHERE n.nspname = 'public'
      AND LOWER(c.relname) = LOWER('#{sanitized_name}')
      AND c.relkind = 'r'
    SQL

    comment_result = ActiveRecord::Base.connection.execute(comment_sql).first
    comment = comment_result ? comment_result["comment"] : nil

    {
      valid: true,
      table_name: table_name,
      column_count: column_count,
      comment: comment
    }
  else
    {
      valid: false,
      error: "Table '#{table_name}' not found in database"
    }
  end
rescue StandardError => e
  Rails.logger.error("Table validation error for '#{table_name}': #{e.message}")
  {
    valid: false,
    error: e.message
  }
end