Class: RubyPgExtras::MissingFkIndexes

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_pg_extras/missing_fk_indexes.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.call(table_name) ⇒ Object 



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# File 'lib/ruby_pg_extras/missing_fk_indexes.rb', line 5

def self.call(table_name)
  new.call(table_name)
end

Instance Method Details

#call(table_name) ⇒ Object 



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# File 'lib/ruby_pg_extras/missing_fk_indexes.rb', line 9

def call(table_name)
  indexes_info = query_module.indexes(in_format: :hash)
  foreign_keys = query_module.foreign_keys(in_format: :hash)

  tables = if table_name
      [table_name]
    else
      foreign_keys.map { |row| row.fetch("table_name") }.uniq
    end

  tables.reduce([]) do |agg, table|
    index_info = indexes_info.select { |row| row.fetch("tablename") == table }
    table_fks = foreign_keys.select { |row| row.fetch("table_name") == table }

    table_fks.each do |fk|
      column_name = fk.fetch("column_name")

      if index_info.none? { |row| row.fetch("columns").split(",").first == column_name }
        agg.push(
          {
            table: table,
            column_name: column_name,
          }
        )
      end
    end

    agg
  end
end