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class Tableless < ActiveRecord::Base | |
def self.column(name, sql_type = nil, default = nil, null = true) | |
columns << ActiveRecord::ConnectionAdapters::Column.new( name.to_s, default, sql_type.to_s, null ) | |
end | |
def self.columns() | |
@columns ||= []; | |
end | |
def self.columns_hash | |
h = {} | |
for c in self.columns | |
h[c.name] = c | |
end | |
return h | |
end | |
def self.column_defaults | |
Hash[self.columns.map{ |col| | |
[col.name, col.default] | |
}] | |
end | |
def self.descends_from_active_record? | |
return true | |
end | |
def persisted? | |
return false | |
end | |
# override the save method to prevent exceptions | |
def save( validate = true ) | |
validate ? valid? : true | |
end | |
end |
@mikrogroove as I said to @ragrawal, post a simplified version of your model code and I'll have a look. We're using that code as-is in 3.2 and it works perfectly.
The base model:
class Tableless < ActiveRecord::Base
def self.table_name
self.name.tableize
end
def self.columns
@columns ||= [];
end
def self.column(name, sql_type = nil, default = nil, null = true)
columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null)
end
def self.columns_hash
@columns_hash ||= Hash[columns.map { |column| [column.name, column] }]
end
def self.column_names
@column_names ||= columns.map { |column| column.name }
end
def self.column_defaults
@column_defaults ||= columns.map { |column| [column.name, nil] }.inject({}) { |m, e| m[e[0]] = e[1]; m }
end
def self.descends_from_active_record?
return true
end
def persisted?
return false
end
# override the save method to prevent exceptions
def save( opts = {} )
options = { :validate => true }.merge(opts)
options[:validate] ? valid? : true
end
end
And an example use:
class Stuff < Tableless
has_many :stuff_things
has_many :things, :through => :stuff_things
column :id, :integer
column :name, :string
column :value, :string
def initialize(attributes = {})
attributes.each do |name, value|
send("#{name}=", value)
end
end
end
@matpowel: Many thanks for taking the time to help! I'm suspecting that my problem has to do with not instantiating the model? My plan is to add to this "fake" table at boot, using values from a configuration file...
I should add that with the example above I get "No such table: 'stuffs'" and not "tablelesses".
This all works for me.. note I removed your initialize method as it's superfluous, that's what the default one will do but without the unsafe eval.
class Thing < Tableless
belongs_to :stuff_thing
column :stuff_thing_id, :integer
column :name, :string
end
class StuffThing < Tableless
belongs_to :stuff
has_many :things
column :stuff_id, :integer
end
class Stuff < Tableless
has_many :stuff_things
has_many :things, :through => :stuff_things
column :id, :integer
column :name, :string
column :value, :string
end
And then you can use them as normal, except that ARel won't chain the has many through very well, I don't know whether your stuff_things etc are actually real AR models, if they are it will work normally.
1.8.7 :064 > s = Stuff.new( :id => 10, :name => "foo", :value => "bar" )
WARNING: Can't mass-assign protected attributes: id
=> #<Stuff id: nil, name: "foo", value: "bar">
1.8.7 :065 > s.stuff_things << StuffThing.new( :stuff => s )
=> [#<StuffThing stuff_id: nil>]
1.8.7 :067 > s.stuff_things.length
=> 1
s.things << Thing.new( :name => "wild thing" )
=> [#<Thing stuff_thing_id: nil, name: "wild thing">]
Thanks for this gist, I made this demo with it: https://github.com/stevemartin/tableless_form
Is anyone using this or similar in Rails 7?
@ragrawal, @matpowel: I've been trying to use this in a Rails 3.2 app and also get "No such table: 'tableless'" - what am I missing?