Class: RailsSqlViews::ConnectionAdapters::MappingDefinition
- Inherits:
-
Object
- Object
- RailsSqlViews::ConnectionAdapters::MappingDefinition
- Defined in:
- lib/rails_sql_views/connection_adapters/abstract/schema_definitions.rb
Instance Method Summary collapse
-
#initialize(columns) ⇒ MappingDefinition
constructor
Generates a hash of the form :old_column => :new_column Initially, it’ll map column names to themselves.
-
#map_column(old_name, new_name) ⇒ Object
Create a mapping from an old column name to a new one.
- #select_cols ⇒ Object
- #view_cols ⇒ Object
Constructor Details
#initialize(columns) ⇒ MappingDefinition
Generates a hash of the form :old_column => :new_column Initially, it’ll map column names to themselves. use map_column to modify the list.
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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_definitions.rb', line 30 def initialize(columns) @columns = columns @map = Hash.new() columns.each do |c| @map[c] = c end end |
Instance Method Details
#map_column(old_name, new_name) ⇒ Object
Create a mapping from an old column name to a new one. If the new name is nil, specify that the old column shouldn’t appear in this new view.
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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_definitions.rb', line 42 def map_column(old_name, new_name) unless @map.include?(old_name) raise ActiveRecord::ActiveRecordError, "column #{old_name} not found, can't be mapped" end if new_name.nil? @map.delete old_name @columns.delete old_name else @map[old_name] = new_name end end |
#select_cols ⇒ Object
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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_definitions.rb', line 54 def select_cols @columns end |
#view_cols ⇒ Object
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# File 'lib/rails_sql_views/connection_adapters/abstract/schema_definitions.rb', line 58 def view_cols @columns.map { |c| @map[c] } end |