Class: Spider::Migrations::DropElement

Inherits:
IrreversibleMigration show all
Defined in:
lib/spiderfw/model/migrations/drop_element.rb

Instance Method Summary collapse

Methods inherited from IrreversibleMigration

#undo

Constructor Details

#initialize(model, element, options = {}) ⇒ DropElement

Returns a new instance of DropElement.



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# File 'lib/spiderfw/model/migrations/drop_element.rb', line 5

def initialize(model, element, options={})
    @model = model
    @element = element
    @options = options
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/spiderfw/model/migrations/drop_element.rb', line 11

def run
    field = @options[:field_name]
    if !field
        schema_field = @model.mapper.schema.field(@element)
        field = schema_field.name if schema_field
    end
    field ||= @model.mapper.storage.column_name(@element)
    desc = @model.mapper.storage.describe_table(@model.mapper.schema.table)
    if desc[:columns][field]
        @model.mapper.storage.drop_field(@model.mapper.schema.table, field)
    end
end