Class: PgGraph::Type::MmTableColumn

Inherits:
TableColumn show all
Defined in:
lib/pg_graph/type/type.rb,
lib/pg_graph/type/dump_type.rb

Direct Known Subclasses

NmTableColumn

Instance Attribute Summary collapse

Attributes inherited from TableColumn

#that_link_column, #this_link_column

Attributes inherited from Column

#postgres_column

Attributes inherited from Field

#type

Instance Method Summary collapse

Methods inherited from TableColumn

#dot_lookup

Methods inherited from Column

#dump, #generated?, #identity?, #kind?, #nullable?, #primary_key?, #readonly?, #reference?, #unique?

Methods included from TableObject

#record_type, #table, #table_type

Methods inherited from Field

#identifier, #schema_identifier

Methods inherited from Node

#dump, #guid, #identifier, #inspect, #inspect_inner, #schema_identifier

Constructor Details

#initialize(record_type, name, that_table_type, mm_table_type, this_link_column, this_mm_column, that_mm_column, that_link_column, **opts) ⇒ MmTableColumn

:unique in this context means that the associated records of this column are unique



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# File 'lib/pg_graph/type/type.rb', line 615

def initialize(
    record_type, name, that_table_type, mm_table_type,
    this_link_column, this_mm_column, that_mm_column, that_link_column,
    **opts)

#     puts "MmTableColumn#initialize"
#     indent {
#       puts "record: #{record_type}"
#       puts "column: #{name}"
#       puts this_mm_column
#       puts this_link_column
#       puts that_mm_column
#       puts that_link_column
#     }

  constrain record_type, RecordType
  constrain that_table_type, TableType
  constrain mm_table_type, TableType
  mm_table_type.table.mm_table? or raise Error, "Link table expected"
  super(record_type, name, that_table_type, this_link_column, that_link_column, **opts)
  @mm_table_type = mm_table_type
  @this_mm_column = this_mm_column
  @that_mm_column = that_mm_column
end

Instance Attribute Details

#mm_table_type ⇒ Object (readonly)

Returns the value of attribute mm_table_type.



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# File 'lib/pg_graph/type/type.rb', line 603

def mm_table_type
  @mm_table_type
end

#that_mm_column ⇒ Object (readonly)

Postgres column in the NM table that links to the embedding record. This is typically the ‘<that-table>_id’ column



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# File 'lib/pg_graph/type/type.rb', line 611

def that_mm_column
  @that_mm_column
end

#this_mm_column ⇒ Object (readonly)

Postgres column in the NM table that links to this table. This is typically the ‘<this-table>_id’ column



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# File 'lib/pg_graph/type/type.rb', line 607

def this_mm_column
  @this_mm_column
end

Instance Method Details

#dump_type ⇒ Object 



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# File 'lib/pg_graph/type/dump_type.rb', line 62

def dump_type
  print \
      " (#{this_link_column} -> #{mm_table.name}.#{this_mm_column}," +
      " #{mm_table.name}.#{that_mm_column} -> #{that_table.name}.#{that_link_column}) (MmTableColumn)"
end

#mm_record_type ⇒ Object 



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# File 'lib/pg_graph/type/type.rb', line 602

def mm_record_type() mm_table_type.record_type end

#mm_table ⇒ Object

The link table between the two tables



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# File 'lib/pg_graph/type/type.rb', line 601

def mm_table() mm_table_type.table end

#that_record_type ⇒ Object 



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# File 'lib/pg_graph/type/type.rb', line 598

def that_record_type() that_table_type.record_type end

#that_table ⇒ Object

The other table in the relationship



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# File 'lib/pg_graph/type/type.rb', line 596

def that_table() that_table_type.table end