instance method
select_value
Ruby on Rails 5.0.7.2
Since v4.2.11.3 Last seen in v5.0.7.2Available in: v4.2.11.3 v5.0.7.2
Signature
select_value(arel, name = nil, binds = [])No documentation comment.
Parameters
-
arelreq -
nameopt = nil -
bindsopt = []
Source
# File activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb, line 10
def select_value(arel, name = nil, binds = [])
arel, binds = binds_from_relation arel, binds
sql = to_sql(arel, binds)
execute_and_clear(sql, name, binds) do |result|
result.getvalue(0, 0) if result.ntuples > 0 && result.nfields > 0
end
end
Defined in activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb line 10
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Defined in ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements