ruby - How to remove the outer array but still keep the inner elements in their arrays in a Rails SQL string? -

i have array:

array = [["1","one"], ["2","two"], ["3","three"]] 

how remove outer square brackets, removing 1 dimension array, looks this:

array = ["1","one"], ["2","two"], ["3","three"] 

i know if wanted flatten entire array, 1 large array, use flatten. however, want rid of outer dimension, while keeping inner elements within respective arrays.

essentially trying query:

 phone.where(["brand_name in (?) , os in (?) , price_category in (?)", ["nokia"], ["blackberry", "android"], ["1", "2"]]) 

but instead, getting. notice 1 more set of array brackets around corresponding column values.

 phone.where(["brand_name in (?) , os in (?) , price_category in (?)", [["nokia"], ["blackberry", "android"], ["1", "2"]]]) 

this method:

def self.checkbox_search(params_hash)     params_array = ["brand_name", "os", "price_category"]     column_array = []     key_array = []     params_hash.each |k,v|       if params_array.include?(k)          column_array << v          key_array << k + ' in (?)'       end     end   joined_keys = key_array.join(" , ") + ", " + "#{column_array}"   phone.where([#{joined_keys}]) end 

i grabbing params hash, , putting in checkbox_search, goes through hash , puts key values in key_array, , puts values in column_array, if meet specified criteria of key includes params_array. join entire string in joined_keys, put results of joined_keys inside phone.where() string

you're assembling arrays wrong way:

phone.where([ key_array.join(" , ") ] + column_array) 

that appends column_array values. if inline them they'll pushed down in terms of nesting. note #{...} has no place here, that's used string interpolation , mess things badly.

technically second version equivalent first due how it's parsed , assigned:

x = [1,2],[3,4] # => [[1, 2], [3, 4]] x # => [[1, 2], [3, 4]] 

that notation's used situations this:

x,y = [1,2],[3,4] # => [[1, 2], [3, 4]] x # => [1, 2] y # => [3, 4] 

there's no "outer dimension" can remove. either have array of arrays, or have singular array that's flat.