How to combine entries from two NSMutableDictionary objects? - objective-c

Question

i try and combine my dictionaries but to be honest i have no idea how. i try like thus, but two overtake one. sorry for the bad english.
[dict addEntriesFromDictionary:dict2];
1
<plist version="1.0">
<dict>
<key>Main</key>
<dict>
<key>DataStorage1</key>
<dict>
<key>A</key>
<string></string>
<key>B</key>
<string></string>
<key>C</key>
<string></string>
</dict>
</dict>
</dict>
</plist>
2
<plist version="1.0">
<dict>
<key>Main</key>
<dict>
<key>DataStorage2</key>
<dict>
<key>A</key>
<string></string>
<key>B</key>
<string></string>
<key>C</key>
<string></string>
</dict>
</dict>
</dict>
</plist>
I would like to make:
<plist version="1.0">
<dict>
<key>Main</key>
<dict>
<key>DataStorage1</key>
<dict>
<key>A</key>
<string></string>
<key>B</key>
<string></string>
<key>C</key>
<string></string>
</dict>
<key>DataStorage2</key>
<dict>
<key>A</key>
<string></string>
<key>B</key>
<string></string>
<key>C</key>
<string></string>
</dict>
</dict>
</dict>
I tried, but it never combined correctly.

Answer 1

Both dict and dict2 have one one key-value pair with the common key "Main".
Therefore
[dict addEntriesFromDictionary:dict2];
replaces the entire "Main" dictionary in dict with the value from dict2.
What you probably want is
[dict[#"Main"] addEntriesFromDictionary:dict2[#"Main"]];
to add the key-values pairs from the "Main" dictionary in dict2 to the "Main"
dictionary in dict. (This assumes that the "Main" dictionary in dict
is mutable.)
Example:
NSURL *url1 = [[NSBundle mainBundle] URLForResource:#"plist1" withExtension:#"plist"];
NSURL *url2 = [[NSBundle mainBundle] URLForResource:#"plist2" withExtension:#"plist"];
NSMutableDictionary *dict1 = [NSMutableDictionary dictionaryWithContentsOfURL:url1];
NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithContentsOfURL:url2];
[dict1[#"Main"] addEntriesFromDictionary:dict2[#"Main"]];