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module Humble
class Column
attr_reader :column_name
def initialize(name)
@column_name = name
end
def prepare(entity)
return {} if primary_key? && has_default_value?(entity)
{ column_name.to_sym => entity.public_send(column_name.to_sym) }
end
def matches?(column_name)
@column_name == column_name
end
def apply(row, entity, session)
value = row[column_name]
entity.public_send("#{@column_name}=", value)
end
def primary_key?
false
end
end
class PrimaryKeyColumn < Column
attr_reader :default
def initialize(name, default)
super(name)
@default = default
end
def destroy(connection, entity)
connection.where(column_name.to_sym => entity.id).delete
end
def primary_key?
true
end
def has_default_value?(entity)
entity.id == nil || @default == entity.id
end
end
class BelongsTo < Column
def initialize(name, type)
super(name)
@type = type
end
def apply(row, entity, session)
value = row[column_name]
entity.public_send("#{attribute_name}=", session.find(@type, value))
end
def prepare(entity)
{ column_name.to_sym => '' }
end
private
def attribute_name
column_name.to_s.gsub(/_id/, '')
end
end
class HasMany < Column
def initialize(attribute, type)
super(attribute)
@attribute, @type = attribute, type
end
def apply(row, entity, session)
items = session.find_all(@type)
entity.public_send("#{@attribute}=", items)
end
def prepare(entity)
{ }
end
end
end
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