Module: ActiveRecord::ConnectionAdapters::SQLite3::SchemaStatements

Included in:
ActiveRecord::ConnectionAdapters::SQLite3Adapter
Defined in:
lib/active_record/connection_adapters/sqlite3/schema_statements.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#create_schema_dumper(options) ⇒ Object 



50
51
52
 
# File 'lib/active_record/connection_adapters/sqlite3/schema_statements.rb', line 50

def create_schema_dumper(options)
  SQLite3::SchemaDumper.create(self, options)
end

#indexes(table_name) ⇒ Object

Returns an array of indexes for the given table.



8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/active_record/connection_adapters/sqlite3/schema_statements.rb', line 8

def indexes(table_name)
  exec_query("PRAGMA index_list(#{quote_table_name(table_name)})", "SCHEMA").map do |row|
    # Indexes SQLite creates implicitly for internal use start with "sqlite_".
    # See https://www.sqlite.org/fileformat2.html#intschema
    next if row["name"].starts_with?("sqlite_")

    index_sql = query_value(<<-SQL, "SCHEMA")
      SELECT sql
      FROM sqlite_master
      WHERE name = #{quote(row['name'])} AND type = 'index'
      UNION ALL
      SELECT sql
      FROM sqlite_temp_master
      WHERE name = #{quote(row['name'])} AND type = 'index'
    SQL

    /\sWHERE\s+(?<where>.+)$/i =~ index_sql

    columns = exec_query("PRAGMA index_info(#{quote(row['name'])})", "SCHEMA").map do |col|
      col["name"]
    end

    # Add info on sort order for columns (only desc order is explicitly specified, asc is
    # the default)
    orders = {}
    if index_sql # index_sql can be null in case of primary key indexes
      index_sql.scan(/"(\w+)" DESC/).flatten.each { |order_column|
        orders[order_column] = :desc
      }
    end

    IndexDefinition.new(
      table_name,
      row["name"],
      row["unique"] != 0,
      columns,
      where: where,
      orders: orders
    )
  end.compact
end