if your array looks like
array = [
{:name => "Hitesh" , :age => 27 , :place => "xyz"} ,
{:name => "John" , :age => 26 , :place => "xtz"} ,
{:name => "Anil" , :age => 26 , :place => "xsz"}
]
And you Want To know if some value is already present in your array. Use Find Method
array.find {|x| x[:name] == "Hitesh"}
This will return object if Hitesh is present in name otherwise return nil