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

#add_foreign_key(from_table, to_table, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlite3/schema_statements.rb', line 55

def add_foreign_key(from_table, to_table, **options)
  alter_table(from_table) do |definition|
    to_table = strip_table_name_prefix_and_suffix(to_table)
    definition.foreign_key(to_table, **options)
  end
end

#create_schema_dumper(options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlite3/schema_statements.rb', line 81

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

#indexes(table_name) ⇒ Object

Returns an array of indexes for the given table.



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# 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("      SELECT sql\n      FROM sqlite_master\n      WHERE name = \#{quote(row['name'])} AND type = 'index'\n      UNION ALL\n      SELECT sql\n      FROM sqlite_temp_master\n      WHERE name = \#{quote(row['name'])} AND type = 'index'\n    SQL\n\n    /\\bON\\b\\s*\"?(\\w+?)\"?\\s*\\((?<expressions>.+?)\\)(?:\\s*WHERE\\b\\s*(?<where>.+))?\\z/i =~ index_sql\n\n    columns = exec_query(\"PRAGMA index_info(\#{quote(row['name'])})\", \"SCHEMA\").map do |col|\n      col[\"name\"]\n    end\n\n    orders = {}\n\n    if columns.any?(&:nil?) # index created with an expression\n      columns = expressions\n    else\n      # Add info on sort order for columns (only desc order is explicitly specified,\n      # asc is the default)\n      if index_sql # index_sql can be null in case of primary key indexes\n        index_sql.scan(/\"(\\w+)\" DESC/).flatten.each { |order_column|\n          orders[order_column] = :desc\n        }\n      end\n    end\n\n    IndexDefinition.new(\n      table_name,\n      row[\"name\"],\n      row[\"unique\"] != 0,\n      columns,\n      where: where,\n      orders: orders\n    )\n  end.compact\nend\n", "SCHEMA")

#remove_foreign_key(from_table, to_table = nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlite3/schema_statements.rb', line 62

def remove_foreign_key(from_table, to_table = nil, **options)
  to_table ||= options[:to_table]
  options = options.except(:name, :to_table)
  foreign_keys = foreign_keys(from_table)

  fkey = foreign_keys.detect do |fk|
    table = to_table || begin
      table = options[:column].to_s.delete_suffix("_id")
      Base.pluralize_table_names ? table.pluralize : table
    end
    table = strip_table_name_prefix_and_suffix(table)
    fk_to_table = strip_table_name_prefix_and_suffix(fk.to_table)
    fk_to_table == table && options.all? { |k, v| fk.options[k].to_s == v.to_s }
  end || raise(ArgumentError, "Table '#{from_table}' has no foreign key for #{to_table || options}")

  foreign_keys.delete(fkey)
  alter_table(from_table, foreign_keys)
end