Class | ThinkingSphinx::Index::FauxColumn |
In: |
lib/thinking_sphinx/index/faux_column.rb
|
Parent: | Object |
Instances of this class represent database columns and the stack of associations that lead from the base model to them.
The name and stack are accessible through methods starting with __ to avoid conflicting with the method_missing calls that build the stack.
Create a new column with a pre-defined stack. The top element in the stack will get shifted to be the name value.
Returns true if the stack is empty and if the name is a string - which is an indication that of raw SQL, as opposed to a value from a table‘s column.
This handles any ‘invalid’ method calls and sets them as the name, and pushing the previous name into the stack. The object returns itself.
If there‘s a single argument, it becomes the name, and the method symbol goes into the stack as well. Multiple arguments means new columns with the original stack and new names (from each argument) gets returned.
Easier to explain with examples:
col = FauxColumn.new :a, :b, :c col.__name #=> :c col.__stack #=> [:a, :b] col.whatever #=> col col.__name #=> :whatever col.__stack #=> [:a, :b, :c] col.something(:id) #=> col col.__name #=> :id col.__stack #=> [:a, :b, :c, :whatever, :something] cols = col.short(:x, :y, :z) cols[0].__name #=> :x cols[0].__stack #=> [:a, :b, :c, :whatever, :something, :short] cols[1].__name #=> :y cols[1].__stack #=> [:a, :b, :c, :whatever, :something, :short] cols[2].__name #=> :z cols[2].__stack #=> [:a, :b, :c, :whatever, :something, :short]
Also, this allows method chaining to build up a relevant stack:
col = FauxColumn.new :a, :b col.__name #=> :b col.__stack #=> [:a] col.one.two.three #=> col col.__name #=> :three col.__stack #=> [:a, :b, :one, :two]