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Contents
module SchemaPlus
module ActiveRecord
module ConnectionAdapters
#
# SchemaPlus adds several methods to Column
#
module Column
attr_reader :default_expr
attr_writer :model # model gets set by SchemaPlus::ActiveRecord::Base::columns_with_schema_plus
# Returns the list of IndexDefinition instances for each index that
# refers to this column. Returns an empty list if there are no
# such indexes.
def indexes
@indexes ||= @model.indexes.select{|index| index.columns.include? self.name}
end
# If the column is in a unique index, returns a list of names of other columns in
# the index. Returns an empty list if it's a single-column index.
# Returns nil if the column is not in a unique index.
def unique_scope
if index = indexes.select{|i| i.unique}.sort_by{|i| i.columns.size}.first
index.columns.reject{|name| name == self.name}
end
end
# Returns true if the column is in a unique index. See also
# unique_scope
def unique?
indexes.any?{|i| i.unique}
end
# Returns true if the column is in one or more indexes that are
# case sensitive
def case_sensitive?
indexes.any?{|i| i.case_sensitive?}
end
# Returns the circumstance in which the column must have a value:
# nil if the column may be null
# :save if the column has no default value
# :update otherwise
def required_on
if null
nil
elsif default.nil?
:save
else
:update
end
end
# The default as_jon includes all instance variables. but
# @model can't be dumped (it contains circular references)
def as_json(options=nil)
instance_values.except "model", "adapter"
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems