Class: ActiveRecord::View::Introspection::Postgres

Inherits:
Abstract
  • Object
show all
Defined in:
lib/activerecord/view/introspection/postgres.rb

Constant Summary collapse

REGCLASS = 
Arel.sql 'regclass'
PG_TRUE = 
Arel.sql 'true'
PG_FALSE = 
Arel.sql 'false'
NOT_A_VIEW = 
Arel::Nodes.build_quoted 'Not a view'

Instance Method Summary collapse

Methods inherited from Abstract

#arel_cast, #arel_fn, #arel_quoted, #arel_quoted?, #default_connection, #definition_for, #inspect, #process_view_definition, #select_manager, #views

Instance Method Details

#catch_undefined_table ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/activerecord/view/introspection/postgres.rb', line 31

def catch_undefined_table
  yield
rescue ActiveRecord::StatementInvalid => e
  if e.original_exception.kind_of? PG::UndefinedTable
    raise e if raise_error?

    nil
  else
    # :nocov:
    raise e
    # :nocov:
  end
end

#fetch_view_definition_query(view_name, **options) ⇒ Object 



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# File 'lib/activerecord/view/introspection/postgres.rb', line 12

def fetch_view_definition_query(view_name, **options)
  select_manager.project nullify_if_not_view pg_get_viewdef(view_name, **options)
end

#nullify_if_not_view(expression) ⇒ Arel::Nodes::NamedFunction

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Arel::Nodes::NamedFunction) 


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# File 'lib/activerecord/view/introspection/postgres.rb', line 26

def nullify_if_not_view(expression)
  arel_fn 'NULLIF', expression, NOT_A_VIEW
end

#pg_get_viewdef(view_name, pretty: false, **options) ⇒ Arel::Nodes::NamedFunction

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Arel::Nodes::NamedFunction) 


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# File 'lib/activerecord/view/introspection/postgres.rb', line 18

def pg_get_viewdef(view_name, pretty: false, **options)
  pretty_bool = pretty ? PG_TRUE : PG_FALSE

  arel_fn 'pg_get_viewdef', arel_cast(view_name, REGCLASS), pretty_bool
end