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Contents
# This changes Sequel's literalization of IN/NOT IN with an empty
# array value to not return NULL even if one of the referenced
# columns is NULL:
#
# DB[:test].where(:name=>[])
# # SELECT * FROM test WHERE (1 = 0)
# DB[:test].exclude(:name=>[])
# # SELECT * FROM test WHERE (1 = 1)
#
# The default Sequel behavior is to respect NULLs, so that when
# name is NULL, the expression returns NULL.
#
# You can load this extension into specific datasets:
#
# ds = DB[:table]
# ds = ds.extension(:empty_array_ignore_nulls)
#
# Or you can load it into all of a database's datasets, which
# is probably the desired behavior if you are using this extension:
#
# DB.extension(:empty_array_ignore_nulls)
#
module Sequel
module EmptyArrayIgnoreNulls
# Use a simple expression that is always true or false, never NULL.
def empty_array_value(op, cols)
{1 => ((op == :IN) ? 0 : 1)}
end
end
Dataset.register_extension(:empty_array_ignore_nulls, EmptyArrayIgnoreNulls)
end
Version data entries
12 entries across 12 versions & 2 rubygems