Method: ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements#indexes

Defined in:
activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

#indexes(table_name) ⇒ Object

Returns an array of indexes for the given table.



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 86

def indexes(table_name) # :nodoc:
  scope = quoted_scope(table_name)

  result = query("    SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid), t.oid,\n                    pg_catalog.obj_description(i.oid, 'pg_class') AS comment, d.indisvalid\n    FROM pg_class t\n    INNER JOIN pg_index d ON t.oid = d.indrelid\n    INNER JOIN pg_class i ON d.indexrelid = i.oid\n    LEFT JOIN pg_namespace n ON n.oid = t.relnamespace\n    WHERE i.relkind IN ('i', 'I')\n      AND d.indisprimary = 'f'\n      AND t.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n    ORDER BY i.relname\n  SQL\n\n  result.map do |row|\n    index_name = row[0]\n    unique = row[1]\n    indkey = row[2].split(\" \").map(&:to_i)\n    inddef = row[3]\n    oid = row[4]\n    comment = row[5]\n    valid = row[6]\n    using, expressions, include, nulls_not_distinct, where = inddef.scan(/ USING (\\w+?) \\((.+?)\\)(?: INCLUDE \\((.+?)\\))?( NULLS NOT DISTINCT)?(?: WHERE (.+))?\\z/m).flatten\n\n    orders = {}\n    opclasses = {}\n    include_columns = include ? include.split(\",\").map { |c| Utils.unquote_identifier(c.strip.gsub('\"\"', '\"')) } : []\n\n    if indkey.include?(0)\n      columns = expressions\n    else\n      columns = column_names_from_column_numbers(oid, indkey)\n\n      # prevent INCLUDE columns from being matched\n      columns.reject! { |c| include_columns.include?(c) }\n\n      # add info on sort order (only desc order is explicitly specified, asc is the default)\n      # and non-default opclasses\n      expressions.scan(/(?<column>\\w+)\"?\\s?(?<opclass>\\w+_ops(_\\w+)?)?\\s?(?<desc>DESC)?\\s?(?<nulls>NULLS (?:FIRST|LAST))?/).each do |column, opclass, desc, nulls|\n        opclasses[column] = opclass.to_sym if opclass\n        if nulls\n          orders[column] = [desc, nulls].compact.join(\" \")\n        else\n          orders[column] = :desc if desc\n        end\n      end\n    end\n\n    IndexDefinition.new(\n      table_name,\n      index_name,\n      unique,\n      columns,\n      orders: orders,\n      opclasses: opclasses,\n      where: where,\n      using: using.to_sym,\n      include: include_columns.presence,\n      nulls_not_distinct: nulls_not_distinct.present?,\n      comment: comment.presence,\n      valid: valid\n    )\n  end\nend\n", "SCHEMA")