Module: RailsSqlViews::ConnectionAdapters::SchemaStatements

Defined in:
lib/rails_sql_views/connection_adapters/abstract/schema_statements.rb

Instance Method Summary collapse

Instance Method Details

#create_mapping_view(old_name, new_name, options = {}) {|mapper| ... } ⇒ Object

Also creates a view, with the specific purpose of remapping column names to make non-ActiveRecord tables friendly with the naming conventions, while maintaining legacy app compatibility.

Yields:

  • (mapper) 


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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_statements.rb', line 37

def create_mapping_view(old_name, new_name, options = {})
  return unless supports_views?
  
  col_names = columns(old_name).collect { |col| col.name.to_sym }
  mapper = MappingDefinition.new(col_names)
  
  yield mapper
  
  if options[:force]
    drop_view(new_name) rescue nil
  end

  view_sql = "CREATE VIEW #{new_name} "
  if supports_view_columns_definition?
    view_sql << "(#{mapper.view_cols.collect { |c| quote_column_name(c) }.join(', ')}) "
  end
  view_sql << "AS SELECT #{mapper.select_cols.collect { |c| quote_column_name(c) }.join(', ')} FROM #{old_name}"
  execute view_sql
end

#create_view(name, select_query, options = {}) ⇒ Object

Create a view. The options hash can include the following keys:

:check_option

Specify restrictions for inserts or updates in updatable views. ANSI SQL 92 defines two check option values: CASCADED and LOCAL. See your database documentation for allowed values.



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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_statements.rb', line 9

def create_view(name, select_query, options={})
  if supports_views?
    view_definition = ViewDefinition.new(self, select_query)
    
    if block_given?
      yield view_definition
    end

    if options[:force]
      drop_view(name) rescue nil
    end

    create_sql = "CREATE VIEW "
    create_sql << "#{quote_table_name(name)} "
    if supports_view_columns_definition? && !view_definition.to_sql.blank?
      create_sql << "("
      create_sql << view_definition.to_sql
      create_sql << ") " 
    end
    create_sql << "AS #{view_definition.select_query}"
    create_sql << " WITH #{options[:check_option]} CHECK OPTION" if options[:check_option]
    execute create_sql
  end
end

#drop_view(name, options = {}) ⇒ Object

Drop a view. The options hash can include the following keys:

:drop_behavior

Specify the drop behavior. ANSI SQL 92 defines two drop behaviors, CASCADE and RESTRICT. See your database documentation to determine what drop behaviors are available.



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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_statements.rb', line 62

def drop_view(name, options={})
  if supports_views?
    drop_sql = "DROP VIEW #{quote_table_name(name)}"
    drop_sql << " #{options[:drop_behavior]}" if options[:drop_behavior]
    execute drop_sql
  end
end