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module ActiveRecord::ConnectionAdapters::DatabaseLimits

Public Instance Methods

allowed_index_name_length() Show source 
# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 20
def allowed_index_name_length
  index_name_length
end

Returns the maximum allowed length for an index name. This limit is enforced by Rails and is less than or equal to index_name_length. The gap between index_name_length is to allow internal Rails operations to use prefixes in temporary operations.

in_clause_length() Show source 
# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 32
def in_clause_length
  nil
end

Returns the maximum number of elements in an IN (x,y,z) clause. nil means no limit.

index_name_length() Show source 
# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 26
def index_name_length
  max_identifier_length
end

Returns the maximum length of an index name.

table_alias_length() Show source 
# File activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb, line 11
def table_alias_length
  max_identifier_length
end

Returns the maximum length of a table alias.

© 2004–2020 David Heinemeier Hansson
Licensed under the MIT License.