ruby - How to compare the structure and type of two hash tables, not the values -

i trying compare structure of 2 hash tables. want see if given hash table subset of master table.

example of valid sub-table:

master_table = {a: string, b: object, c: { nested_a: integer, nested_b: integer} }  my_table     = {a: 'cool value', c: {nested_b: 540} 

example of invalid sub-table

my_table     = {a: wrongtype.new} 

or

my_table     = {a: 'cool value', new_key: "i don't belong here!"} 

edit: if looks duck , quacks kinda duck, accept duck.

i have data driven application user have provide config file defines application's behavior. want make sure users' configuration files match structure , types defined in master config file.

in regards sergio tulentsev's comment, issue above in first example of invalid sub-table, :a's type not valid according master table. in second case, there exists key not present in master table , therefor incorrect.

code

def valid?(master_table, my_table)   my_table.all? |k,v|     case master_table.key?(k)     when true             mv = master_table[k]       case v       when hash mv.is_a?(hash) && valid?(mv, v)       else mv.is_a?(class) && v.is_a?(mv)       end     else false     end   end end 

examples

master_table = {a: string, b: object, c: {nested_a: integer, nested_b: integer}}  my_table = {a: 'cool value', c: {nested_b: 540}} valid?(master_table, my_table)   #=> true  my_table = {a: 'cool value', new_key: "i don't belong here!"} valid?(master_table, my_table)   #=> false  my_table = {a: 'cool value', new_key: "i don't belong here!"} valid?(master_table, my_table)   #=> false  my_table = {a: 'cool value', c: 42} valid?(master_table, my_table)   #=> false 

master_table = {a: string, b: object, c: {nested_a: {nested_b:   {nested_c: integer}}}}  my_table = {a: 'cool value', b: [1,2,3], c: {nested_a: {nested_b:   {nested_c: 42}}}} valid?(master_table, my_table)   #=> true  my_table = {a: 'cool value', b: [1,2,3], c: {nested_a: {nested_b:   {nested_c: 'cat'}}}} valid?(master_table, my_table)   #=> false  my_table = {a: 'cool value', b: [1,2,3], c: {nested_a: {nested_b: 42}}} valid?(master_table, my_table)   #=> false