(params, columns)
return ExportParameters(format_, keyword_filters, sql_filters)
Converts a dictionary of parameters from the user to sql filters.

    If a parameter is of the form <field name>-<suffix>, where suffix is
    defined in `sql_directives`, the corresponding function is used to
    produce a filter.
Converts a dictionary of parameters from the user to sql filters.
Converts a dictionary of parameters from the user to sql filters .
def process_url_params(params, columns):
    """
    Converts a dictionary of parameters from the user to sql filters.

    If a parameter is of the form <field name>-<suffix>, where suffix is
    defined in `sql_directives`, the corresponding function is used to
    produce a filter.
    """
    # support passing `format` instead of `$format` so we don't break people's
    # existing URLs.  Let's remove this once we can.
    format_ = params.get('$format', params.get('format', Format.UNZIPPED_CSV))
    keyword_filters = {}
    sql_filters = []
    for key, value in params.items():
        if key in ('$format', 'format'):
            continue

        for suffix, fn in sql_directives:
            if key.endswith(suffix):
                field = key[:-len(suffix)]
                if field not in columns:
                    raise UserQueryError(_('No field named {}').format(field))
                sql_filters.append(fn(columns[field], value))
                break
        else:
            if key in columns:
                keyword_filters[key] = value
            else:
                raise UserQueryError(_('Invalid filter parameter: {}')
                                     .format(key))
    return ExportParameters(format_, keyword_filters, sql_filters)
def process_url_params ( params , columns ) : # support passing `format` instead of `$format` so we don't break people's # existing URLs.  Let's remove this once we can. format_ = params . get ( '$format' , params . get ( 'format' , Format . UNZIPPED_CSV ) ) keyword_filters = { } sql_filters = [ ] for key , value in params . items ( ) : if key in ( '$format' , 'format' ) : continue for suffix , fn in sql_directives : if key . endswith ( suffix ) : field = key [ : - len ( suffix ) ] if field not in columns : raise UserQueryError ( _ ( 'No field named {}' ) . format ( field ) ) sql_filters . append ( fn ( columns [ field ] , value ) ) break else : if key in columns : keyword_filters [ key ] = value else : raise UserQueryError ( _ ( 'Invalid filter parameter: {}' ) . format ( key ) ) return ExportParameters ( format_ , keyword_filters , sql_filters )