Module: RailsSqlViews4::ConnectionAdapters::SchemaStatements

Defined in:
lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb', line 4

def self.included(base)
  base.alias_method_chain :drop_table, :cascade
end

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_views4/connection_adapters/abstract/schema_statements.rb', line 62

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_or_create_view_base(name, select_query, options, init_create_sql) ⇒ Object 



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# File 'lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb', line 29

def create_or_create_view_base(name, select_query, options, init_create_sql)
  if supports_views?
    view_definition = ViewDefinition.new(self, select_query)
    
    if block_given?
      yield view_definition
    end

    if options[:force]
      puts" TOTO : Please, force option is not correctly implemented in postgres"
      drop_view(name) rescue nil
    end

    # create_sql = "CREATE VIEW "
    create_sql =  init_create_sql
    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

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



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# File 'lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb', line 25

def create_or_replace_view(name, select_query, options={})
  create_or_create_view_base(name, select_query, options, "CREATE OR REPLACE VIEW ")
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.

we have a problem with the force option in postgres rescue nil will rescue the ruby program, but we still have an error for postgres and unfortunatly for postgress, the first error will stop the interpretor : ActiveRecord::StatementInvalid Exception: PG::InFailedSqlTransaction: ERROR:

current transaction is aborted, commands ignored until end of transaction block



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# File 'lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb', line 21

def create_view(name, select_query, options={})
  create_or_create_view_base(name, select_query, options, "CREATE VIEW ")
end

#drop_table_with_cascade(table_name, options = {}) ⇒ Object

TODO : est appelé avec SQLITE, alors que c’est pas ok



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# File 'lib/rails_sql_views4/connection_adapters/abstract/schema_statements.rb', line 83

def drop_table_with_cascade(table_name, options = {})
  # execute "DROP TABLE #{quote_table_name(table_name)} CASCADE"
  if supports_drop_table_cascade? 
    execute "DROP TABLE #{quote_table_name(table_name)} CASCADE"
  else
    execute "DROP TABLE #{quote_table_name(table_name)}"
  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_views4/connection_adapters/abstract/schema_statements.rb', line 97

def drop_view(name, options={})
  # if supports_views?  # because of postgres (see create_view with force option)
  if supports_views? & table_exists?(name)
    drop_sql = "DROP VIEW #{quote_table_name(name)}"
    drop_sql << " #{options[:drop_behavior]}" if options[:drop_behavior]
    execute drop_sql
  end
end